2013-14 west central MT avalanche advisories
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January 10, 2014 Avalanche Advisory<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com
fficeffice" /><o></o>
This entry was posted on Friday, January 10th, 2014 at 7:31 am
Categories: Advisories<o></o>
<o></o>
Above 6000 feet, the avalanche danger is CONSIDERABLE on wind loaded terrain steeper than 35 degrees. Avalanche conditions are now dangerous. Careful snowpack evaluation, cautious route finding and conservative decision making is essential. Natural avalanches are possible, human-triggered avalanches are likely.<o></o>
At all other locations and elevations the avalanche danger is MODERATE. New snow and wind has heightened avalanche conditions on some terrain features. Natural avalanches are unlikely but human-triggered avalanches are possible.<o></o>
Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Friday, January 10, 2014. The danger rating expires at midnight tonight and does not apply to operating ski areas.<o></o>
Weather and Snowpack<o></o>
All mountain locations have received several inches of new snow during the past 48 hours. The Bitterroot Range has picked up the most with easily over a foot of new snow in most locations. The Twin Lakes SNOTEL is reporting 1.8 inches of snow water equivalent (SWE) since Tuesday morning or about 18 inches of new snow. Mountain temperatures are in the 20′s this morning with westerly wind gusting into the 40′s already at 8000 feet.<o></o>
Observers were finding exceptional skiing and riding conditions with the newest snow sluffing easily on steeper terrain. By the end of the day Thursday the wind was picking up and wind slab formations were touchy. Observers in the Bitterroot were able to trigger small wind slabs that were running several hundred feet down slope on north and east facing aspects. The wind was moving a lot of snow by days end at all Bitterroot mountain locations including the Lolo Pass area and the Rattlesnake.<o></o>
We did not receive any information from the Hoodoo Pass area. Hoodoo SNOTEL recorded 1.5 inches SWE since Tuesday morning. There is no doubt about the wind moving snow there today as well.<o></o>
The primary avalanche problem is wind slab formation on any leeward terrain. This is only going to get worse with the anticipated high winds this weekend.<o></o>
A secondary problem is storm snow slab formation on all steep terrain. Yesterday this new snow was sluffing easily and was quite manageable as it had not yet formed a slab. During the clear weather break prior to this storm, small facets formed on the snow surface and this new snow has not bonded to that surface. The current dense storm snow and wind will easily form slabs that will be difficult to escape from if you get caught.<o></o>
The deeply buried facets at or near the ground continue to gain strength but we’re still able to produce clean, energetic failures with a lot of force. You can find these facets in shallow areas and on windward terrain.<o></o>
<o></o>
Weather and Avalanche Forecast<o></o>
The Missoula Office of the National Weather Service has issued a winter weather advisory for snow accumulation of up to 10 inches at the mountain passes. On Saturday, the confidence is high that widespread damaging winds will develop across the northern Rockies. Mountain top wind speeds may reach the 80mph range. Another round of mountain snow is also expected during this event. Windy conditions and a weather pattern favorable for mountain snow is expected to remain with us through Monday as the jet stream parks over the northern Rockies.<o></o>
I expect the avalanche danger to worsen as these high winds develop. There is a lot of new snow available for transport and with the current weather coming from the west, any new snow will be heavier or denser making it easy for dangerous slabs to form.<o></o>
It looks like we’re getting some of the best snow of the winter. Unfortunately, 60-80 mph winds won’t be much fun and will complicate safe mountain travel.<o></o>
Pay close attention to where the wind deposits snow. Cracking and collapsing are sure signs of instability. Heavy new snow and high winds almost always create unstable conditions. Pick your routes wisely, never expose more than one person at a time to a slope steep enough to slide and make sure everyone has rescue equipment in good working order.<o></o>
Be safe out there! Send us a note at info@missoulaavalanche.org or use our public observation form if you get out and see anything interesting. Your information is very helpful and may help someone come home alive.<o></o>
I will issue the next regular advisory on Tuesday, January 14, 2014.<o></o>
<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Friday, January 10th, 2014 at 7:31 am
Categories: Advisories<o
></o><o></o>Above 6000 feet, the avalanche danger is CONSIDERABLE on wind loaded terrain steeper than 35 degrees. Avalanche conditions are now dangerous. Careful snowpack evaluation, cautious route finding and conservative decision making is essential. Natural avalanches are possible, human-triggered avalanches are likely.<o
></o>At all other locations and elevations the avalanche danger is MODERATE. New snow and wind has heightened avalanche conditions on some terrain features. Natural avalanches are unlikely but human-triggered avalanches are possible.<o
></o>Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Friday, January 10, 2014. The danger rating expires at midnight tonight and does not apply to operating ski areas.<o
></o>Weather and Snowpack<o
></o>All mountain locations have received several inches of new snow during the past 48 hours. The Bitterroot Range has picked up the most with easily over a foot of new snow in most locations. The Twin Lakes SNOTEL is reporting 1.8 inches of snow water equivalent (SWE) since Tuesday morning or about 18 inches of new snow. Mountain temperatures are in the 20′s this morning with westerly wind gusting into the 40′s already at 8000 feet.<o
></o>Observers were finding exceptional skiing and riding conditions with the newest snow sluffing easily on steeper terrain. By the end of the day Thursday the wind was picking up and wind slab formations were touchy. Observers in the Bitterroot were able to trigger small wind slabs that were running several hundred feet down slope on north and east facing aspects. The wind was moving a lot of snow by days end at all Bitterroot mountain locations including the Lolo Pass area and the Rattlesnake.<o
></o>We did not receive any information from the Hoodoo Pass area. Hoodoo SNOTEL recorded 1.5 inches SWE since Tuesday morning. There is no doubt about the wind moving snow there today as well.<o
></o>The primary avalanche problem is wind slab formation on any leeward terrain. This is only going to get worse with the anticipated high winds this weekend.<o
></o>A secondary problem is storm snow slab formation on all steep terrain. Yesterday this new snow was sluffing easily and was quite manageable as it had not yet formed a slab. During the clear weather break prior to this storm, small facets formed on the snow surface and this new snow has not bonded to that surface. The current dense storm snow and wind will easily form slabs that will be difficult to escape from if you get caught.<o
></o>The deeply buried facets at or near the ground continue to gain strength but we’re still able to produce clean, energetic failures with a lot of force. You can find these facets in shallow areas and on windward terrain.<o
></o><o
></o>Weather and Avalanche Forecast<o
></o>The Missoula Office of the National Weather Service has issued a winter weather advisory for snow accumulation of up to 10 inches at the mountain passes. On Saturday, the confidence is high that widespread damaging winds will develop across the northern Rockies. Mountain top wind speeds may reach the 80mph range. Another round of mountain snow is also expected during this event. Windy conditions and a weather pattern favorable for mountain snow is expected to remain with us through Monday as the jet stream parks over the northern Rockies.<o
></o>I expect the avalanche danger to worsen as these high winds develop. There is a lot of new snow available for transport and with the current weather coming from the west, any new snow will be heavier or denser making it easy for dangerous slabs to form.<o
></o>It looks like we’re getting some of the best snow of the winter. Unfortunately, 60-80 mph winds won’t be much fun and will complicate safe mountain travel.<o
></o>Pay close attention to where the wind deposits snow. Cracking and collapsing are sure signs of instability. Heavy new snow and high winds almost always create unstable conditions. Pick your routes wisely, never expose more than one person at a time to a slope steep enough to slide and make sure everyone has rescue equipment in good working order.<o
></o>Be safe out there! Send us a note at info@missoulaavalanche.org or use our public observation form if you get out and see anything interesting. Your information is very helpful and may help someone come home alive.<o
></o>I will issue the next regular advisory on Tuesday, January 14, 2014.<o
></o><o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
January 14, 2014 Avalanche Advisory<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This entry was posted on Tuesday, January 14th, 2014 at 6:10 am
Categories: Advisories<o></o>
<o></o>
The avalanche danger is CONSIDERABLE on slopes steeper than 35 degrees. High winds and heavy snowfall have formed dangerous wind and storm snow slabs on steep terrain above 6000 feet. Natural avalanches are possible and human-triggered avalanche are likely in these areas.<o></o>
The avalanche danger is MODERATE at all other locations and elevations. Natural avalanches are unlikely but human-triggered avalanches are possible on all other slopes steeper than 35 degrees due to the heavy snowfall and high wind west central Montana experienced in the past 3-4 days.<o></o>
Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday, January 14, 2014. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The danger rating expires at midnight tonight.<o></o>
Weather and Snowpack<o></o>
Heavy snow and high winds this past weekend increased the avalanche danger prompting the first avalanche warning of the season. All locations including the southern Bitterroot mountains near Lost Trail Pass received nearly 30 inches of storm snow with winds gusting into the 50 mph range during this period. Twin Lake, Lolo Pass, Hoodoo and North Fork Jocko SNOTEL stations recorded 2.5 to over 3 inches of SWE from Friday to Monday.<o></o>
This morning, mountain temperatures are in the thirties and SNOTEL stations picked up about 2 inches of snow overnight. Wind speeds at the Point Six and Deer Mountain RAWS stations are in the 40-50 mph range.<o></o>
On Monday, avalanche specialists were in the Hoodoo Pass, Rattlesnake Wilderness and southern Swan range near Seeley Lake. Each site was experiencing high winds and heavy snowfall Monday making travel difficult and visibility poor.<o></o>
At each of these locations, the primary avalanche problem is wind slab development on any steep lee aspect. The character of the high winds of the past few days makes assessment of this slab tricky. Many places can be wind loaded further down slope and more terrain cross loaded than is typical under these high wind events.<o></o>
The secondary avalanche problem is storm snow slabs. The snow of the past 3 days was deposited on a weaker layer of snow and a thin layer of facets that formed during the last clear weather we had last week. While the new snow appears to be bonding well to the older snow surface, many of the stability tests were showing failures at this interface. See the pit profiles here.<o></o>
The southern Swan did not receive as much new snow as other areas but the winds were strong here as well so wind slab formation is the primary concern. The newest snow had not yet formed a slab but was sloughing easily on slopes steeper than 40 degrees.<o></o>
The more deeply buried facets near the ground show up in some of our pits mainly in the shallower snow packs or near rocky areas. The location of this weak condition is highly variable so the only way to know for sure is to dig down into the snow.<o></o>
<o></o>
Weather and Avalanche Forecast<o></o>
We can finally report that after today, the wind should not be a factor. The backcountry weather forecast issued by the Missoula National Weather Service Office indicates a relaxing of the wind as high pressure builds over the region during the next few days. Valley inversions will strengthen and mountain temperatures will rise into the 40′s by Saturday.<o></o>
I expect to see the snowpack to continue adjusting to the heavy load it received over the past few days. It will also gain strength with the moderate temperatures in the forecast. We can also expect to see another crop of surface hoar and near surface facets develop during this clear weather which may be an issue after the next storm.<o></o>
Dudley Improta will issue the next advisory on Friday, January 17.<o></o>
Thanks to the folks at Bitterroot Brewery, the businesses who donated raffle items and to everyone who came out to support us at last Friday’s benefit in Hamilton. It was a big success and a ton of fun! THANK YOU!<o></o>
<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Tuesday, January 14th, 2014 at 6:10 am
Categories: Advisories<o
></o><o></o>The avalanche danger is CONSIDERABLE on slopes steeper than 35 degrees. High winds and heavy snowfall have formed dangerous wind and storm snow slabs on steep terrain above 6000 feet. Natural avalanches are possible and human-triggered avalanche are likely in these areas.<o
></o>The avalanche danger is MODERATE at all other locations and elevations. Natural avalanches are unlikely but human-triggered avalanches are possible on all other slopes steeper than 35 degrees due to the heavy snowfall and high wind west central Montana experienced in the past 3-4 days.<o
></o>Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday, January 14, 2014. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The danger rating expires at midnight tonight.<o
></o>Weather and Snowpack<o
></o>Heavy snow and high winds this past weekend increased the avalanche danger prompting the first avalanche warning of the season. All locations including the southern Bitterroot mountains near Lost Trail Pass received nearly 30 inches of storm snow with winds gusting into the 50 mph range during this period. Twin Lake, Lolo Pass, Hoodoo and North Fork Jocko SNOTEL stations recorded 2.5 to over 3 inches of SWE from Friday to Monday.<o
></o>This morning, mountain temperatures are in the thirties and SNOTEL stations picked up about 2 inches of snow overnight. Wind speeds at the Point Six and Deer Mountain RAWS stations are in the 40-50 mph range.<o
></o>On Monday, avalanche specialists were in the Hoodoo Pass, Rattlesnake Wilderness and southern Swan range near Seeley Lake. Each site was experiencing high winds and heavy snowfall Monday making travel difficult and visibility poor.<o
></o>At each of these locations, the primary avalanche problem is wind slab development on any steep lee aspect. The character of the high winds of the past few days makes assessment of this slab tricky. Many places can be wind loaded further down slope and more terrain cross loaded than is typical under these high wind events.<o
></o>The secondary avalanche problem is storm snow slabs. The snow of the past 3 days was deposited on a weaker layer of snow and a thin layer of facets that formed during the last clear weather we had last week. While the new snow appears to be bonding well to the older snow surface, many of the stability tests were showing failures at this interface. See the pit profiles here.<o
></o>The southern Swan did not receive as much new snow as other areas but the winds were strong here as well so wind slab formation is the primary concern. The newest snow had not yet formed a slab but was sloughing easily on slopes steeper than 40 degrees.<o
></o>The more deeply buried facets near the ground show up in some of our pits mainly in the shallower snow packs or near rocky areas. The location of this weak condition is highly variable so the only way to know for sure is to dig down into the snow.<o
></o><o
></o>Weather and Avalanche Forecast<o
></o>We can finally report that after today, the wind should not be a factor. The backcountry weather forecast issued by the Missoula National Weather Service Office indicates a relaxing of the wind as high pressure builds over the region during the next few days. Valley inversions will strengthen and mountain temperatures will rise into the 40′s by Saturday.<o
></o>I expect to see the snowpack to continue adjusting to the heavy load it received over the past few days. It will also gain strength with the moderate temperatures in the forecast. We can also expect to see another crop of surface hoar and near surface facets develop during this clear weather which may be an issue after the next storm.<o
></o>Dudley Improta will issue the next advisory on Friday, January 17.<o
></o>Thanks to the folks at Bitterroot Brewery, the businesses who donated raffle items and to everyone who came out to support us at last Friday’s benefit in Hamilton. It was a big success and a ton of fun! THANK YOU!<o
></o><o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
January 17, 2014 Avalanche Advisory<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This entry was posted on Friday, January 17th, 2014 at 6:21 am
Categories: Advisories<o></o>
<o></o>
The avalanche danger in the west central Montana backcountry is MODERATE. It may be possible to trigger an avalanche on wind-loaded slopes steeper than 35 degrees above 7500 feet in elevation. On other terrain in the advisory area the avalanche danger is LOW. “Low” danger does not mean “no” danger; there is always some avalanche risk in riding and skiing slopes steeper than 35 degrees.<o></o>
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for January 17, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight. (Jan. 17).<o></o>
Weather and Snowpack Analysis<o></o>
This morning mountain temperatures are variable; from the low twenties (F) near Lolo Pass and Point 6 near Missoula, to thirty degrees (F) on Saddle Mountain near Lost Trail Pass. Winds above 6000 feet are blowing 15 to 25 mph out of the west and southwest. The last couple of days have been a great time to be in the winter backcountry, thanks to the high pressure system that settled over the area after last weekend’s storm.<o></o>
Observers were out in the Northern Bitterroots near the Brushy Fork and near Lost Trail Pass. I was in the Rattlesnakes Wednesday and in Crystal Theatre near Lolo Pass yesterday. The snow we received from the big storm has settled and inversions have created warm temperatures that have helped solidify the snowpack. There is some lingering doubt about the strength of the interface of the storm snow and the possiblity of isolated windslabs at higher elevations.<o></o>
(Snow Profile Crystal Theatre) (Snow Profile Northern Bitterroots) (Snow Profile Lost Trail Pass)<o></o>
Pit observations Crystal Theatre 1_16_14 - Photo<o></o>
If I wanted to trigger an avalanche; I would look for very steep slopes or couloirs at high elevations that haven’t been scoured from high winds, or jump on the biggest cornice I could find. Otherwise, we have generally stable conditions for now.<o></o>
Weather Forecast and Avalanche Outlook<o></o>
The high pressure ridge is expected to dominate the weather with a weak disturbance on Sunday. High elevation winds are expected to diminish. The inversion will build with warm daytime temperatures in the mountains. I would expect the snowpack to stabilize further in the next few days.<o></o>
The Weather Service predicts a decrease in the high cloud cover; this should provide more opportunity for surface hoar growth on shaded, cold aspects. That could be our next weak layer.<o></o>
Twin Peaks Avalanche near Philipsburg 12_24_13<o></o>
Steve has posted a slide show of the Twin Peaks avalanche near Philipsburg on Dec. 24, 2013. This slide was out of our advisory area, but provides valuable education.<o></o>
Kettlehouse Pint Nite – Jan. 22<o></o>
Kettlehouse Pint Nite, benefitting Missoulaavalanche and the Avalanche Center is coming up on January 22; I hear there are tickets to Alta, as well as some of the local areas, in the raffle.<o></o>
If you have time, we’d appreciate hearing from you. Our public observation form appears to be down this morning; in the meantime you can send us a quick note atinfo@missoulaavalanche.org if you have an observation you would like to report.<o></o>
Ski and ride safe! Have a great weekend.<o></o>
Steve will issue the next advisory on January 21, 2014.<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center.<o></o>
<o> </o>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Friday, January 17th, 2014 at 6:21 am
Categories: Advisories<o
></o><o></o>The avalanche danger in the west central Montana backcountry is MODERATE. It may be possible to trigger an avalanche on wind-loaded slopes steeper than 35 degrees above 7500 feet in elevation. On other terrain in the advisory area the avalanche danger is LOW. “Low” danger does not mean “no” danger; there is always some avalanche risk in riding and skiing slopes steeper than 35 degrees.<o
></o>Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for January 17, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight. (Jan. 17).<o
></o>Weather and Snowpack Analysis<o
></o>This morning mountain temperatures are variable; from the low twenties (F) near Lolo Pass and Point 6 near Missoula, to thirty degrees (F) on Saddle Mountain near Lost Trail Pass. Winds above 6000 feet are blowing 15 to 25 mph out of the west and southwest. The last couple of days have been a great time to be in the winter backcountry, thanks to the high pressure system that settled over the area after last weekend’s storm.<o
></o>Observers were out in the Northern Bitterroots near the Brushy Fork and near Lost Trail Pass. I was in the Rattlesnakes Wednesday and in Crystal Theatre near Lolo Pass yesterday. The snow we received from the big storm has settled and inversions have created warm temperatures that have helped solidify the snowpack. There is some lingering doubt about the strength of the interface of the storm snow and the possiblity of isolated windslabs at higher elevations.<o
></o>(Snow Profile Crystal Theatre) (Snow Profile Northern Bitterroots) (Snow Profile Lost Trail Pass)<o
></o>Pit observations Crystal Theatre 1_16_14 - Photo<o
></o>If I wanted to trigger an avalanche; I would look for very steep slopes or couloirs at high elevations that haven’t been scoured from high winds, or jump on the biggest cornice I could find. Otherwise, we have generally stable conditions for now.<o
></o>Weather Forecast and Avalanche Outlook<o
></o>The high pressure ridge is expected to dominate the weather with a weak disturbance on Sunday. High elevation winds are expected to diminish. The inversion will build with warm daytime temperatures in the mountains. I would expect the snowpack to stabilize further in the next few days.<o
></o>The Weather Service predicts a decrease in the high cloud cover; this should provide more opportunity for surface hoar growth on shaded, cold aspects. That could be our next weak layer.<o
></o>Twin Peaks Avalanche near Philipsburg 12_24_13<o
></o>Steve has posted a slide show of the Twin Peaks avalanche near Philipsburg on Dec. 24, 2013. This slide was out of our advisory area, but provides valuable education.<o
></o>Kettlehouse Pint Nite – Jan. 22<o
></o>Kettlehouse Pint Nite, benefitting Missoulaavalanche and the Avalanche Center is coming up on January 22; I hear there are tickets to Alta, as well as some of the local areas, in the raffle.<o
></o>If you have time, we’d appreciate hearing from you. Our public observation form appears to be down this morning; in the meantime you can send us a quick note atinfo@missoulaavalanche.org if you have an observation you would like to report.<o
></o>Ski and ride safe! Have a great weekend.<o
></o>Steve will issue the next advisory on January 21, 2014.<o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center.<o
></o><o
> </o>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
January 24, 2014 Avalanche Advisory<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This entry was posted on Friday, January 24th, 2014 at 4:12 am
Categories: Advisories<o></o>
<o></o>
The avalanche danger in the west central Montana backcountry is LOW. Natural and human-triggered avalanches are unlikely.<o></o>
Although avalanche conditions are generally safe, you must consider that even under LOW avalanche danger conditions, it is possible to trigger an avalanche in isolated areas or on extreme terrain.<o></o>
Hello! This is Steve Karkanen with the West Central Montana Avalanche Center’s January 24, 2014 Avalanche Advisory. The avalanche danger rating expires at midnight tonight and does not apply to operating ski areas.<o></o>
<o></o>
Weather and Snowpack<o></o>
The clear dry spell continues. Most areas received a quick shot of moisture Wednesday but it was only enough new snow to make you mad.<o></o>
Many locations are seeing abundant surface hoar growth and near surface faceting due to the clear skies and big temperature gradients at the snow surface. Dudley does a nice job describing the current conditions in this You Tube video: YouTube video describing current condition.<o></o>
Mild temperatures continue to strengthen our snowpack. The deeply buried facets we were describing last month are not much of a concern anymore except in steep, heavily shaded areas where the snowpack is shallow and rocky.<o></o>
Snow profiles and stability tests are giving all observers and avalanche specialists a high level of confidence that conditions are mostly stable.<o></o>
It is possible to trigger wet loose snow avalanches on steep terrain during the warmest part of the day. The large cornices that formed two weeks ago are a wild card and can easily collapse under the weight of a person or sled. The best way to manage them is to give them a wide berth especially during warm periods.<o></o>
<o></o>
Weather and Avalanche Forecast<o></o>
The Missoula Weather Service Office expects this high pressure to dominate our weather at least until Sunday when an arctic air mass moves into the northern Rockies with gusty east winds and a better chance of snow. By mid week, we may see moisture begin streaming into the area as the ridge breaks down.<o></o>
I expect the avalanche danger to remain similar through the weekend or until we start seeing more snow. When that happens, conditions are going to change pretty fast.<o></o>
Dudley will issue the next advisory on January 28.<o></o>
Thanks to everyone who came down to the Northside Kettlehouse Wednesday. Your support does make a difference. Have a safe weekend!<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Friday, January 24th, 2014 at 4:12 am
Categories: Advisories<o
></o><o></o>The avalanche danger in the west central Montana backcountry is LOW. Natural and human-triggered avalanches are unlikely.<o
></o>Although avalanche conditions are generally safe, you must consider that even under LOW avalanche danger conditions, it is possible to trigger an avalanche in isolated areas or on extreme terrain.<o
></o>Hello! This is Steve Karkanen with the West Central Montana Avalanche Center’s January 24, 2014 Avalanche Advisory. The avalanche danger rating expires at midnight tonight and does not apply to operating ski areas.<o
></o><o
></o>Weather and Snowpack<o
></o>The clear dry spell continues. Most areas received a quick shot of moisture Wednesday but it was only enough new snow to make you mad.<o
></o>Many locations are seeing abundant surface hoar growth and near surface faceting due to the clear skies and big temperature gradients at the snow surface. Dudley does a nice job describing the current conditions in this You Tube video: YouTube video describing current condition.<o
></o>Mild temperatures continue to strengthen our snowpack. The deeply buried facets we were describing last month are not much of a concern anymore except in steep, heavily shaded areas where the snowpack is shallow and rocky.<o
></o>Snow profiles and stability tests are giving all observers and avalanche specialists a high level of confidence that conditions are mostly stable.<o
></o>It is possible to trigger wet loose snow avalanches on steep terrain during the warmest part of the day. The large cornices that formed two weeks ago are a wild card and can easily collapse under the weight of a person or sled. The best way to manage them is to give them a wide berth especially during warm periods.<o
></o><o
></o>Weather and Avalanche Forecast<o
></o>The Missoula Weather Service Office expects this high pressure to dominate our weather at least until Sunday when an arctic air mass moves into the northern Rockies with gusty east winds and a better chance of snow. By mid week, we may see moisture begin streaming into the area as the ridge breaks down.<o
></o>I expect the avalanche danger to remain similar through the weekend or until we start seeing more snow. When that happens, conditions are going to change pretty fast.<o
></o>Dudley will issue the next advisory on January 28.<o
></o>Thanks to everyone who came down to the Northside Kettlehouse Wednesday. Your support does make a difference. Have a safe weekend!<o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
STORM coming!!!!!
Today's report said up to 2" per HOUR of snowfall.
2 FEET predicted at Lolo Pass tonight.
Today's report said up to 2" per HOUR of snowfall.
2 FEET predicted at Lolo Pass tonight.
January 28, 2014 Avalanche Advisory<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com
This entry was posted on Tuesday, January 28th, 2014 at 6:32 am
Categories: Advisories<o
This morning the avalanche danger in the West Central Montana backcountry is LOW. The avalanche danger is expected to escalate this evening through Thursday due to the weather forecast. A winter storm warning has been issued for the area.<o
Even during LOW danger there is always some avalanche problem to consider. Today I would consider the possibility of an avalanche in steep (>35 degrees) pockets at high elevations (>7500’), with a shallow snowpack, particularly near rock outcroppings. I would also consider the danger of a cornice fall; again at high elevations.<o
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for January 28, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight. (Jan. 28).<o
Weather and Snowpack Analysis<o
This morning the Point 6 weather station is recording westerly mountain winds in the high twenties. Mountain temperatures are generally in the low teens with single digits at Lolo Pass. The Weather Service has issued a winter storm warning for our area. Moderate to heavy snow will be deposited on a generally weak snow surface. These pit profiles and pictures show the current weak surfaces (snow profile Bitterroots/ Brushy Fork) (snow profile Rattlesnake) (photo Lolo Pass) (photo Rattlesnakes) .<o
High pressure, for almost 10 days, has provided beautiful weather and great travel conditions. It has also allowed for surface hoar growth and near surface faceting which has created a weak snow surface. The storm predicted will deposit its snow on this weak surface.<o
Weather Forecast and Avalanche Outlook<o
A significant winter storm is expected to hit the area this evening and last through Thursday. Snowfall rates could reach 1 to 2 inches per hour. The storm may produce 16 to 20 inches of snow in the mountains by Thursday. Of course, the storm will be accompanied by winds; in the 20 mph range.<o
I know we’re all powder starved; but the avalanche danger will increase. If this storm lives up to its press releases; it would be prudent to let things settle out before easing into any steep terrain. Observers will be in the mountains on Thursday, gathering information for the Friday advisory.<o
Avalanche Classes<o
The University of Montana and missoulaavalnche are offering a free avalanche workshop beginning this evening. The class begins at 6pm in the North Urey Underground Lecture Hall.<o
The University and missoulaavalanche are also offering two Level 1 classes in the Bitterroot.One class is scheduled to begin February 6; the second class begins February 27.<o
If you have time, we’d appreciate hearing from you. You can send us a report on avalanche or snow conditions by using our public observations form or sending us a quick note atinfo@missoulaavalanche.org .<o
Ski and ride safe! Stay aware of changing conditions.<o
I will issue the next advisory January 31.<o
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center.<o
ttt
Avalanche Warning January 29, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com
This entry was posted on Wednesday, January 29th, 2014 at 2:31 pm
Categories: Advisories<o
<o
An AVALANCHE WARNING is in effect for the mountains of west central Montana. The avalanche danger is HIGH. Dangerous avalanche conditions exist on terrain steeper than 30 degrees above 5000 feet. Heavy snowfall and high winds have created conditions where natural avalanches are likely and human-triggered avalanches very likely. Travel on or underneath avalanche terrain is not recommended.<o
This is Dudley Improta with this special avalanche information update for January 29, 2014. This avalanche warning expires in 12 hours and does not apply to operating ski areas. The winter storm we are currently experiencing is predicted to last through tomorrow. <o
Weather and Snowpack Analysis<o
This afternoon the Point 6 weather station is recording westerly mountain winds with gusts in excess of 50mph . Remote weather stations are reporting up to 10 inches of snow since this morning, with nearly 1.5 inches of snow water equivalent. This is a very heavy load on top of the weak snow surface created by the recent, extended high pressure system. More snow is forecast through Thursday.<o
We are currently under a winter storm warning issued by the Weather Service. This storm is expected to last through tomorrow (Thursday).<o
Weather Forecast and Avalanche Outlook<o
Yesterday, in the advisory, I noted we’re all powder starved; but the avalanche danger has increased. It would be prudent to let things settle out before easing into any steep terrain. Observers will be in the mountains tomorrow (Thursday), gathering information for the regular Friday advisory.<o
Avalanche Classes<o
The University and missoulaavalanche are also offering two Level 1 classes in the Bitterroot.One class is scheduled to begin February 6; the second class begins February 27.<o
If you have time, we’d appreciate hearing from you. You can send us a report on avalanche or snow conditions by using our public observations form or sending us a quick note at info@missoulaavalanche.org .<o
The next regular advisory will be posted January 31.<o
considerable
Avalanche Advisory January 31, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com
This entry was posted on Friday, January 31st, 2014 at 6:44 am
Categories: Advisories<o
On slopes above 6000 feet that are steeper than 35 degrees the avalanche danger in the West Central Montana backcountry is CONSIDERABLE. On all other terrain, steeper than 30 degrees the avalanche danger is MODERATE.<o
We have rescinded the avalanche warning associated with the recent winter storm; but there is still potential for human-triggered avalanches.<o
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for January 31, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight. (Jan. 31).<o
Weather and Snowpack Analysis<o
This morning, west and northwest mountain winds are ranging from 5 to 17mph. Mountain temperatures are in the mid-twenties to mid-teens (F). The storm that began Tuesday evening deposited 1.5 to 2 feet of snow. The area continued to pick up snow last night and it is snowing lightly this morning. The storm came in warm and then temperatures went cold; this trend helped avalanche conditions be less sensitive.<o
Yesterday, observers in the field were finding a weak snow surface from the recent storm. Stability tests were showing low strength and moderate energy in the new snow. (snow profile Rattlesnakes) (snow profile Lost Trail Pass).<o
The Snow Bowl Patrol was able to trigger 10-15 inch soft slab avalanches with explosives on southwest couloirs. Travis Craft and I were able to ski-cut this same slab, on a northeast aspect in the Rattlesnake backcountry. (Photo_ human-triggered soft slab_Rattlesnakes) Observers at Lost Trail and the guides at Yurtski, in the Southern Swans, noted the same storm slab. All areas reported weak surface conditions with no discernible hard slab formation. And, although out of the advisory area, observers at Lookout Pass noted the same conditions.<o
The surface hoar, that formed previous to the storm, was not the consistent weak layer for the new snow to fail on. We dug five pits in the Rattlesnakes and didn’t find it; but, the guides at Yurtski reported they were avoiding areas where they had seen it – not a bad idea.<o
This existing soft slab can be triggered, and could be a problem on very steep slopes. Keep in mind there is more snow, from last night, available to slide. The soft slab is probably 18 to 22 inches this morning.<o
The main avalanche concern, for now, is the storm slab on steep open slopes.<o
Weather Forecast and Avalanche Outlook<o
Another 4 inches, or so, of snow is forecast for today. Then, by Saturday, snowfall is predicted to taper off. Mountain clouds will hamper visibility in the high country. Winds should not be too bad (5-10mph) with high temperatures in the low twenties (F).<o
I would expect avalanche conditions to remain about the same through the weekend. Be aware of the potential to trigger the new snow on steep, open slopes at the higher elevations (>6000’).<o
Ski and ride safe! Have a great weekend.<o
The next avalanche advisory will be issued February 4.<o
We always appreciate any observations you might have time to send in. You can use ourpublic observations form or just send us a quick note at info@missoulaavalanche.org.<o
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center.<o
<o
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
February 7, 2014, Avalanche Advisoryfficeffice" /><O></O>
This entry was posted on Friday, February 7th, 2014 at 6:53 am
Categories: Advisories<O></O>
<O></O>
The avalanche danger is MODERATE in the west central Montana backcountry.<O></O>
Natural avalanches are unlikely but human-triggered avalanches are possible on open terrain steeper than 35 degrees.<O></O>
Recently wind loaded terrain has the most potential but all aspects must be approached carefully. A weak layer that formed during the 2 weeks of clear weather last month is now buried about 2 feet deep throughout western Montana.<O></O>
Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Friday, February 7, 2014. The avalanche danger rating expires at midnight tonight (2/7/14) and does not apply to operating ski areas.<O></O>
<O></O>
Weather and Snowpack<O></O>
Very cold temperatures and high winds above 8000 feet made the decision on whether to take a sick day a little easier this week.<O></O>
On Wednesday, east winds gusting into the mid-forties were recorded at Point Six north of Missoula, bringing the wind chill to -63 degrees at one point. These winds have since diminished and temperatures are much more tolerable.<O></O>
The wind this morning is WSW@15 mph at Point Six and SSE@4 mph at Deer Mountain east of Darby. Mountain temperatures are mostly above the zero degree mark as cloud cover moves into the area with a weather system that is pushing the cold air mass to the east. Temperatures in the Seeley Lake area are -10F and local valleys remain below zero.<O></O>
Cold temperatures allowed weak layers to persist and get weaker and high east winds moved snow around in many areas.<O></O>
Because of the cold temperatures and ski area closures Thursday morning, our field data is limited but we did receive good reports from the Downing Mountain Lodge (DML) near Hamilton, a public observation from the North Fork Lost Horse area and from Carl at Yurt Ski Thursday. Our specialists toured near Lolo Pass yesterday.<O></O>
John at DML reported to us that he and clients were feeling good about stability. There was no visible avalanche activity, little wind and no other obvious evidence of instability as they ventured onto and enjoyed excellent skiing conditions on steeper terrain.<O></O>
At Lolo Pass, Tim and Dave found wind affected snow and felt that wind slabs are the primary concern with the possibility of triggering a deeper slab in isolated areas. In some areas, a slab above a surface hoar/near surface facet layer that was buried last week can be easily triggered by the weight of a skier or snowmobile. A snowmobiler triggered a slide near Beaver Ridge last Sunday.<O></O>
In the northern mountains near Seeley Lake, the situation is a little different. Carl at Yurt Ski reported that the high winds earlier this week affected all aspects particularly near the ridge tops. “Backward” cornices were developing in places that are typically wind scoured and they experienced widespread whoomping and collapse noises on the ridges. They observed a small natural wind slab release in Highmarkers so they have been sticking to the trees and lower angle terrain.<O></O>
The primary avalanche problem is the possibility of triggering a wind slab on steep slopes that have been recently wind loaded. Strong east winds this week have moved much of last weeks storm snow onto areas that are not usually wind loaded. A secondary avalanche problem is the facet layer that formed in late January. It is now buried about 2 feet deep and can be triggered if you hit the right spot. Your avalanche radar needs to be attenuated for these particular problems.<O></O>
You can best mitigate your risk by checking to see if these weak layers are present on the slope you want to ski or ride on. Stay away from facet factories like rock outcrops and small groups of trees, as these tend to be places where fractures can be more easily initiated. If a slope looks like it has been heavily wind loaded, it probably is. Trust your instincts and if you are unsure, don’t push it, and don’t let your partner(s) talk you into taking a chance you are uncomfortable with. Always practice limiting the exposure to your group by making sure only one person at a time is on or below terrain steep enough to slide.<O></O>
<O></O>
Weather and Avalanche Forecast<O></O>
Pacific moisture is starting to stream across the area and is expected to continue through the weekend. Light snowfall and wind is expected today with gradually warming temperatures.<O></O>
As temperatures begin to moderate with light snow accumulation, I expect the snowpack to strengthen with time but if we return to a wetter pattern the avalanche danger will rapidly increase in all areas.<O></O>
We appreciate hearing from you. Your observations are important for everyone who recreates in the western Montana backcountry. Send an observation from our website, send an email to info@missoulaavalanche.org or leave a voice mail at 406-329-3752.<O></O>
<O></O>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <O></O>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<O></O>
ffice" /><O></O>This entry was posted on Friday, February 7th, 2014 at 6:53 am
Categories: Advisories<O
></O><O></O>The avalanche danger is MODERATE in the west central Montana backcountry.<O
></O>Natural avalanches are unlikely but human-triggered avalanches are possible on open terrain steeper than 35 degrees.<O
></O>Recently wind loaded terrain has the most potential but all aspects must be approached carefully. A weak layer that formed during the 2 weeks of clear weather last month is now buried about 2 feet deep throughout western Montana.<O
></O>Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Friday, February 7, 2014. The avalanche danger rating expires at midnight tonight (2/7/14) and does not apply to operating ski areas.<O
></O><O
></O>Weather and Snowpack<O
></O>Very cold temperatures and high winds above 8000 feet made the decision on whether to take a sick day a little easier this week.<O
></O>On Wednesday, east winds gusting into the mid-forties were recorded at Point Six north of Missoula, bringing the wind chill to -63 degrees at one point. These winds have since diminished and temperatures are much more tolerable.<O
></O>The wind this morning is WSW@15 mph at Point Six and SSE@4 mph at Deer Mountain east of Darby. Mountain temperatures are mostly above the zero degree mark as cloud cover moves into the area with a weather system that is pushing the cold air mass to the east. Temperatures in the Seeley Lake area are -10F and local valleys remain below zero.<O
></O>Cold temperatures allowed weak layers to persist and get weaker and high east winds moved snow around in many areas.<O
></O>Because of the cold temperatures and ski area closures Thursday morning, our field data is limited but we did receive good reports from the Downing Mountain Lodge (DML) near Hamilton, a public observation from the North Fork Lost Horse area and from Carl at Yurt Ski Thursday. Our specialists toured near Lolo Pass yesterday.<O
></O>John at DML reported to us that he and clients were feeling good about stability. There was no visible avalanche activity, little wind and no other obvious evidence of instability as they ventured onto and enjoyed excellent skiing conditions on steeper terrain.<O
></O>At Lolo Pass, Tim and Dave found wind affected snow and felt that wind slabs are the primary concern with the possibility of triggering a deeper slab in isolated areas. In some areas, a slab above a surface hoar/near surface facet layer that was buried last week can be easily triggered by the weight of a skier or snowmobile. A snowmobiler triggered a slide near Beaver Ridge last Sunday.<O
></O>In the northern mountains near Seeley Lake, the situation is a little different. Carl at Yurt Ski reported that the high winds earlier this week affected all aspects particularly near the ridge tops. “Backward” cornices were developing in places that are typically wind scoured and they experienced widespread whoomping and collapse noises on the ridges. They observed a small natural wind slab release in Highmarkers so they have been sticking to the trees and lower angle terrain.<O
></O>The primary avalanche problem is the possibility of triggering a wind slab on steep slopes that have been recently wind loaded. Strong east winds this week have moved much of last weeks storm snow onto areas that are not usually wind loaded. A secondary avalanche problem is the facet layer that formed in late January. It is now buried about 2 feet deep and can be triggered if you hit the right spot. Your avalanche radar needs to be attenuated for these particular problems.<O
></O>You can best mitigate your risk by checking to see if these weak layers are present on the slope you want to ski or ride on. Stay away from facet factories like rock outcrops and small groups of trees, as these tend to be places where fractures can be more easily initiated. If a slope looks like it has been heavily wind loaded, it probably is. Trust your instincts and if you are unsure, don’t push it, and don’t let your partner(s) talk you into taking a chance you are uncomfortable with. Always practice limiting the exposure to your group by making sure only one person at a time is on or below terrain steep enough to slide.<O
></O><O
></O>Weather and Avalanche Forecast<O
></O>Pacific moisture is starting to stream across the area and is expected to continue through the weekend. Light snowfall and wind is expected today with gradually warming temperatures.<O
></O>As temperatures begin to moderate with light snow accumulation, I expect the snowpack to strengthen with time but if we return to a wetter pattern the avalanche danger will rapidly increase in all areas.<O
></O>We appreciate hearing from you. Your observations are important for everyone who recreates in the western Montana backcountry. Send an observation from our website, send an email to info@missoulaavalanche.org or leave a voice mail at 406-329-3752.<O
></O><O
></O>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <O
></O>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<O
></O>
Last edited:
Be careful out there right now.
This entry was posted on Sunday, February 9th, 2014 at 9:32 am
Categories: Advisories<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com
We are raising the avalanche danger in the Bitterroot Mountains from Lost Trail Pass to Lolo Pass to CONSIDERABLE. Natural avalanches are possible, human triggered avalanches are likely. Avalanche conditions are dangerous and require careful snowpack evaluation, skillful route finding and conservative decision making. <o
Good morning! This is Steve Karkanen with an avalanche information update from the West Central Montana Avalanche Center for Sunday, February 9, 2014. The avalanche danger rating expires at midnight tonight (2/9/14) and does not apply to operating ski areas.<o
Backcountry locations in the Bitterroot near Lost Trail Pass have received have received heavy snowfall since Friday and are currently being affected by high winds. We’ve received reports this morning from the Lost Trail backcountry of low stability test scores, collapsing of the snowpack and recent avalanches on steeper terrain.<o
SNOTEL data has been unavailable this weekend so we have no hard data from northern parts of the range other than the Visitor Center at Lolo Pass reports an additional 6 inches new snow this morning. The southern mountains have been impacted the most so far.<o
Missoula Weather Service has issued a winter weather advisory for the Bitterroot mountains with snowfall amounts of up to 8 inches and winds gusting to 25 mph.<o
The avalanche danger is MODERATE at other locations in the west central Montana backcountry.<o
Natural avalanches are unlikely but human-triggered avalanches are possible on open terrain steeper than 35 degrees.<o
Recently wind loaded terrain has the most potential but all aspects must be approached carefully. A weak layer that formed during the 2 weeks of clear weather last month is now buried about 2 feet deep throughout western Montana.<o
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
...
Avalanche Advisory February 11, 2014
<SMALL>This entry was posted on Tuesday, February 11th, 2014 at 6:30 am
Categories: Advisories
</SMALL>
The avalanche danger in the Bitterroot Mountains from Hoodoo Pass to Lost Trail Pass is CONSIDERABLE on slopes steeper than 30 degrees. The avalanche danger is MODERATE in the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake, on slopes steeper than 30 degrees.
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for February 11, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight (Feb. 11).
Weather and Snowpack Analysis
This morning southerly and westerly winds are blowing 15 to 25 mph above 7000 feet. High elevation temperatures are generally warm in the upper twenties (F). It is snowing and the area has picked up 3 to 5 inches since midnight. We are currently under a winter weather advisory.
The southern part of the Bitterroots received a big dump this weekend that packed some weight. Observations from the Lost Trail area on Sunday included widespread collapsing, natural avalanches and low stability scores (Lost Trail pit profile) (Lost Trail pit profile). A quick report from Downing Mountain Lodge indicated 6-8” natural wind slab releases and cautioned about higher exposed terrain where the wind slabs might be larger.
Observations from Sunday and yesterday in the Rattlesnake showed a less sensitive snowpack; although there was abundant sluffing on steep slopes and a skier-triggered wind slab on a northeast slope (Rattlesnake pit profile) (photo skier-triggered wind slab).
Either the wind-slabs or a larger sluff could be trouble if they rake you over some rocks, take you into some trees or deposit you in a gulley. In addition to these two avalanche problems, the surface facets from January’s high pressure are still showing up in some of our pits and in some public observer’s pits.
Weather Forecast and Avalanche Outlook
Here’s the big story. Snow should continue today with a short break this evening before a series of big storms arrive. Predictions are upwards of 2 feet (or more) of snow will accumulate in the high country Wednesday and Thursday; mainly along the MT/ID border. These storms may carry more than 2 inches of snow water equivalent and will be accompanied by strong west and southwest winds. Rain levels may rise above 4000 feet.
If this event happens; no suprise here; the avalanche danger will increase throughout the area.
Last Chance for a Missoulaavalanche Level 1
Missoulaavalanche has openings in the last Level 1 of the season.
If you would like to send us snow observations; you can use our public observations form on the internet or send us a quick e-mail at info@missoulaavalanche.org .
Ski and ride safe!
I’ll issue the next regular advisory Valentine’s Day. If this big snow arrives I’m sure your sweetie would enjoy a new sled or a new pair of fat powder skis; if that’s not in the budget, a nice card and some good chocolate will probably suffice.
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org
Avalanche Warning for February 18, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This entry was posted on Tuesday, February 18th, 2014 at 6:20 am
Categories: Advisories<o></o>
<o></o>
A BACKCOUNTRY AVALANCHE WARNING is in effect for mountain locations above 5000 feet in west central Montana. This includes the Bitterroot mountains from Lost Trail Pass to Hoodoo Pass, the Rattlesnake mountains north of Missoula and the southern Swan and Mission Mountains on Lolo National Forest Lands near Seeley Lake, MT.<o></o>
The avalanche danger is HIGH. Very dangerous avalanche conditions exist. Natural avalanches are likely, human triggered avalanches are very likely. Travel in avalanche terrain is not recommended. Any open terrain steeper than 30 degrees especially recently wind loaded terrain is dangerous. Avoid avalanche paths and their run out zones.<o></o>
Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday, February 18. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight. The avalanche warning will either be extended or allowed to expire Wednesday morning.<o></o>
<o></o>
Weather and Snowpack<o></o>
Heavy new snowfall and high wind speeds are rapidly increasing the stress on weak layers and old storm snow interfaces in many areas.<o></o>
The Bitterroot Range is getting hammered, especially the northern half of the range from Lolo Pass to Hoodoo Pass. The Hoodoo SNOTEL site reports nearly 2 inches of snow water equivalent (SWE) in the past 24 hours and about an inch of SWE at Lolo Pass. Other SNOTEL sites throughout the region report just over a half inch of SWE. Keep in mind that much of the snow came in horizontal so the measured amounts may be skewed.<o></o>
Wind speeds peaked at 60 mph at Point Six and 54 mph at Deer Mountain near Darby. This morning the winds are gusting to 45 from the west at Point Six and SW gusting to 24 mph at Deer Mountain. Mountain temperatures are in the mid 20′s.<o></o>
We received a report from the Ward Mountain area of high winds and heavy snowfall causing near blizzard conditions. 6-8″ of new snow accumulated here with perhaps as much as a foot at some of the higher elevations. Similar conditions were experienced near Lolo Pass and in the Rattlesnake yesterday.<o></o>
The primary avalanche problem today is wind slab formation on any lee terrain steeper than 30 degrees. These will be very sensitive and found in places further down the slope than expected.<o></o>
A secondary problem is the storm snow adding enough weight to make the deeper weak layers reactive again. Facets that formed during the late January dry spell are still present and are now close to the failure point. Stability testing in the Rattlesnake and Lolo Pass areas were bringing out clean energetic failures about a meter deep into the pack. You can view the profiles here.<o></o>
The upper storm snow interfaces were showing signs of strengthening however the newest storm snow was failing readily and on its own on steeper slopes. A loose snow avalanche or sluff may be manageable, but it may also be enough added weight to step down to the deeper weakness to produce an unsurvivable hard slab avalanche.<o></o>
We received several reports of human triggered avalanches over the weekend. One of these resulted in a near full burial and loss of equipment. Thankfully, there were no injuries in this incident and the individual sent us a great report which is posted on our public observations page.<o></o>
This incident is scary in that the individuals have excellent skills and experience but triggered a slab that failed much deeper than expected. We have not visited the site but are confident this failure happened on the faceted layer that formed in late January. We are all thankful no one was injured in this incident.<o></o>
<o></o>
Weather and Avalanche Forecast<o></o>
Winter weather advisories have been posted by the Missoula Office of the National Weather Service. They are forecasting continued heavy snowfall and high winds for the next few days. Some locations favored by orographic lifting may receive over 20 inches over the course of the next couple of days. Wind speeds will be in the 50mph range at ridge tops.<o></o>
The avalanche danger will remain HIGH at least until the next break in weather and the snow has the chance to adjust to this new load.<o></o>
This is a tricky and dangerous snowpack right now. The above close call is a good illustration of what can happen with this now deeply buried weak layer. We’re not finding it everywhere we dig, but when we do, it produces consistently clean failures.<o></o>
Until the storm snow settles, avoid any steep open terrain, be aware of your location in relation to avalanche run out areas and never expose more than 1 person at a time to anything with potential to slide. Make sure all your gear and your partners gear is in good working order.<o></o>
<o></o>
Education<o></o>
There is still room in the Bitterroot Level 1 class that starts next week. This will be an excellent class with two field days in the Lost Trail backcountry. You need to register TODAY!<o></o>
I will issue the next scheduled advisory this Friday, February 21.<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Tuesday, February 18th, 2014 at 6:20 am
Categories: Advisories<o
></o><o></o>A BACKCOUNTRY AVALANCHE WARNING is in effect for mountain locations above 5000 feet in west central Montana. This includes the Bitterroot mountains from Lost Trail Pass to Hoodoo Pass, the Rattlesnake mountains north of Missoula and the southern Swan and Mission Mountains on Lolo National Forest Lands near Seeley Lake, MT.<o
></o>The avalanche danger is HIGH. Very dangerous avalanche conditions exist. Natural avalanches are likely, human triggered avalanches are very likely. Travel in avalanche terrain is not recommended. Any open terrain steeper than 30 degrees especially recently wind loaded terrain is dangerous. Avoid avalanche paths and their run out zones.<o
></o>Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday, February 18. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight. The avalanche warning will either be extended or allowed to expire Wednesday morning.<o
></o><o
></o>Weather and Snowpack<o
></o>Heavy new snowfall and high wind speeds are rapidly increasing the stress on weak layers and old storm snow interfaces in many areas.<o
></o>The Bitterroot Range is getting hammered, especially the northern half of the range from Lolo Pass to Hoodoo Pass. The Hoodoo SNOTEL site reports nearly 2 inches of snow water equivalent (SWE) in the past 24 hours and about an inch of SWE at Lolo Pass. Other SNOTEL sites throughout the region report just over a half inch of SWE. Keep in mind that much of the snow came in horizontal so the measured amounts may be skewed.<o
></o>Wind speeds peaked at 60 mph at Point Six and 54 mph at Deer Mountain near Darby. This morning the winds are gusting to 45 from the west at Point Six and SW gusting to 24 mph at Deer Mountain. Mountain temperatures are in the mid 20′s.<o
></o>We received a report from the Ward Mountain area of high winds and heavy snowfall causing near blizzard conditions. 6-8″ of new snow accumulated here with perhaps as much as a foot at some of the higher elevations. Similar conditions were experienced near Lolo Pass and in the Rattlesnake yesterday.<o
></o>The primary avalanche problem today is wind slab formation on any lee terrain steeper than 30 degrees. These will be very sensitive and found in places further down the slope than expected.<o
></o>A secondary problem is the storm snow adding enough weight to make the deeper weak layers reactive again. Facets that formed during the late January dry spell are still present and are now close to the failure point. Stability testing in the Rattlesnake and Lolo Pass areas were bringing out clean energetic failures about a meter deep into the pack. You can view the profiles here.<o
></o>The upper storm snow interfaces were showing signs of strengthening however the newest storm snow was failing readily and on its own on steeper slopes. A loose snow avalanche or sluff may be manageable, but it may also be enough added weight to step down to the deeper weakness to produce an unsurvivable hard slab avalanche.<o
></o>We received several reports of human triggered avalanches over the weekend. One of these resulted in a near full burial and loss of equipment. Thankfully, there were no injuries in this incident and the individual sent us a great report which is posted on our public observations page.<o
></o>This incident is scary in that the individuals have excellent skills and experience but triggered a slab that failed much deeper than expected. We have not visited the site but are confident this failure happened on the faceted layer that formed in late January. We are all thankful no one was injured in this incident.<o
></o><o
></o>Weather and Avalanche Forecast<o
></o>Winter weather advisories have been posted by the Missoula Office of the National Weather Service. They are forecasting continued heavy snowfall and high winds for the next few days. Some locations favored by orographic lifting may receive over 20 inches over the course of the next couple of days. Wind speeds will be in the 50mph range at ridge tops.<o
></o>The avalanche danger will remain HIGH at least until the next break in weather and the snow has the chance to adjust to this new load.<o
></o>This is a tricky and dangerous snowpack right now. The above close call is a good illustration of what can happen with this now deeply buried weak layer. We’re not finding it everywhere we dig, but when we do, it produces consistently clean failures.<o
></o>Until the storm snow settles, avoid any steep open terrain, be aware of your location in relation to avalanche run out areas and never expose more than 1 person at a time to anything with potential to slide. Make sure all your gear and your partners gear is in good working order.<o
></o><o
></o>Education<o
></o>There is still room in the Bitterroot Level 1 class that starts next week. This will be an excellent class with two field days in the Lost Trail backcountry. You need to register TODAY!<o
></o>I will issue the next scheduled advisory this Friday, February 21.<o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
It's pretty bad right now.
HooDoo went from 65ish to 125 in two weeks. AND there is a lot of rain mixed in to it.
HooDoo went from 65ish to 125 in two weeks. AND there is a lot of rain mixed in to it.
Avalanche Warning Continues<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com
This entry was posted on Wednesday, February 19th, 2014 at 6:36 am
Categories: Advisories<o
A BACKCOUNTRY AVALANCHE WARNING remains in effect for mountain locations above 5000 feet in west central Montana.<o
An additional 6 to 12″ of new snow in the past 24 hours with an increase in overnight winds of up to 60 mph overnight will keep the avalanche danger elevated today. <o
This includes the Bitterroot mountains from Lost Trail Pass to Hoodoo Pass, the Rattlesnake mountains north of Missoula and the southern Swan and Mission Mountains on Lolo National Forest Lands near Seeley Lake, MT.<o
The avalanche danger is HIGH. Very dangerous avalanche conditions exist. Natural avalanches are likely, human triggered avalanches are very likely. Travel in avalanche terrain is not recommended. Any open terrain steeper than 30 degrees especially recently wind loaded terrain is dangerous. Avoid avalanche paths and their run out zones.<o
Good morning! This is Steve Karkanen with an update to the West Central Montana Avalanche Center’s avalanche advisory that was issued on February 19. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight. The avalanche warning will either be extended or allowed to expire Thursday morning.<o
<o
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o> </o>
Information Update for February 20<o></o>
This entry was posted on Thursday, February 20th, 2014 at 7:04 am
Categories: Advisories<o></o>
<o></o>
The backcountry avalanche warning has been allowed to expire but HIGH AVALANCHE DANGER exists on wind loaded terrain steeper than 30 degrees.<o></o>
Good morning! This is Steve Karkanen with an update to the West Central Montana Avalanche Center’s avalanche advisory issued on February 19. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight.<o></o>
The high winds we experienced since Tuesday have diminished, temperatures are cooling and snowfall amounts have tapered off. This morning, SNOTEL data shows that most sites received around .50″ of SWE or about 5-6 inches of new snow. Mountain temperatures are now in the high teens and low twenties and the wind speeds are down to a tolerable 11-15 mph.<o></o>
The main avalanche problem to be looking for now are wind slabs and heavily drifted areas caused by the 50-60 mph winds since Tuesday.<o></o>
The avalanche danger is HIGH Very dangerous avalanche conditions exist. Natural avalanches are likely, human triggered avalanches are very likely. Travel in avalanche terrain is not recommended. Any open terrain steeper than 30 degrees that has been recently wind loaded is dangerous. Avoid avalanche paths and their run out zones.<o></o>
On other terrain steeper than 30 degrees the avalanche danger is CONSIDERABLE. Natural avalanches are possible, human triggered avalanche are probable. Storm snow slabs are the secondary avalanche concern as there are now several different storm snow/old snow surface interfaces that have not had adequate time to bond and adjust to this weeks heavy load. The more deeply buried faceted layer that formed in late January is reactive in many of our stability tests. The close call in the Spruce Creek area is a good example of this potential.<o></o>
The bottom line is that you can’t trust this snowpack right now.<o></o>
This includes areas above 5000 feet in the Bitterroot mountains from Lost Trail Pass to Hoodoo Pass, the Rattlesnake mountains north of Missoula and the southern Swan and Mission Mountains on Lolo National Forest Lands near Seeley Lake, MT.<o></o>
Our field observers and avalanche specialists will be out in force today and I will issue an updated advisory tomorrow (Friday) morning by 0700. Your information is vital to the strength of this program as well. So if you get out and see avalanche activity or simply excellent conditions, let us know.<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o> </o>Information Update for February 20<o
></o>This entry was posted on Thursday, February 20th, 2014 at 7:04 am
Categories: Advisories<o
></o><o></o>The backcountry avalanche warning has been allowed to expire but HIGH AVALANCHE DANGER exists on wind loaded terrain steeper than 30 degrees.<o
></o>Good morning! This is Steve Karkanen with an update to the West Central Montana Avalanche Center’s avalanche advisory issued on February 19. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight.<o
></o>The high winds we experienced since Tuesday have diminished, temperatures are cooling and snowfall amounts have tapered off. This morning, SNOTEL data shows that most sites received around .50″ of SWE or about 5-6 inches of new snow. Mountain temperatures are now in the high teens and low twenties and the wind speeds are down to a tolerable 11-15 mph.<o
></o>The main avalanche problem to be looking for now are wind slabs and heavily drifted areas caused by the 50-60 mph winds since Tuesday.<o
></o>The avalanche danger is HIGH Very dangerous avalanche conditions exist. Natural avalanches are likely, human triggered avalanches are very likely. Travel in avalanche terrain is not recommended. Any open terrain steeper than 30 degrees that has been recently wind loaded is dangerous. Avoid avalanche paths and their run out zones.<o
></o>On other terrain steeper than 30 degrees the avalanche danger is CONSIDERABLE. Natural avalanches are possible, human triggered avalanche are probable. Storm snow slabs are the secondary avalanche concern as there are now several different storm snow/old snow surface interfaces that have not had adequate time to bond and adjust to this weeks heavy load. The more deeply buried faceted layer that formed in late January is reactive in many of our stability tests. The close call in the Spruce Creek area is a good example of this potential.<o
></o>The bottom line is that you can’t trust this snowpack right now.<o
></o>This includes areas above 5000 feet in the Bitterroot mountains from Lost Trail Pass to Hoodoo Pass, the Rattlesnake mountains north of Missoula and the southern Swan and Mission Mountains on Lolo National Forest Lands near Seeley Lake, MT.<o
></o>Our field observers and avalanche specialists will be out in force today and I will issue an updated advisory tomorrow (Friday) morning by 0700. Your information is vital to the strength of this program as well. So if you get out and see avalanche activity or simply excellent conditions, let us know.<o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
Avalanche Advisory for February 25, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This entry was posted on Tuesday, February 25th, 2014 at 6:21 am
Categories: Advisories<o></o>
<o></o>
The avalanche danger is CONSIDERABLE on wind loaded terrain above 5000 feet that is steeper than 35 degrees.<o></o>
Natural avalanches are possible, human triggered avalanches are likely. Careful snowpack evaluation, cautious route finding and conservative decision making is essential on leeward terrain.<o></o>
On all other terrain in the west central Montana backcountry, the avalanche danger is MODERATE. <o></o>
Heightened avalanche conditions can be found on steeper terrain in areas where deeply buried weak faceted snow exists. Snow and terrain must be evaluated carefully to identify these areas of concern.<o></o>
Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday February 25. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The danger rating expires at midnight tonight.<o></o>
<o></o>
Weather and Snowpack<o></o>
A major winter storm impacted western Montana during the past few days bringing February snow totals in the valleys to near record levels. SNOTEL data indicates that many valley locations picked up significantly more snow than many mountain locations. The mountains indeed have received plenty of new snow and conditions appear to be surprising stable.<o></o>
Mountain temperatures this morning are in the teens and winds are light from the north and northeast.<o></o>
SNOTEL stations report about .50 inches of snow water equivalent (SWE) or over 6 inches new snow in the past 12 hours.<o></o>
We’ve received no reports of avalanche activity, natural or otherwise, during the past 4 days. The Snowbowl Ski Patrol did initiate several soft slabs using explosives during morning avalanche control Monday. This involved mostly the newest snowfall from the previous 24 hours. I would expect they are finding similar conditions this morning.<o></o>
In both the Lolo Pass and Rattlesnake backcountry avalanche specialists were pleasantly surprised at how much the stability has improved. The overall snowpack appears to have adjusted well to the new load. No cracking or collapse noise was experienced in either area and stability test scores were high with no propagation.<o></o>
During a Level 1 class in the Rattlesnake this past weekend, instructors reported that stability test scores increased through the weekend. The now deeply buried facet layer still fails cleanly in some pits, but it takes a lot of force to get it to fail and it does not propagate like it did last week. You can view the snow profiles for the Rattlesnake and Lolo Pass backcountry on our 2013/14 Snow Profiles page.<o></o>
The primary avalanche problem today is wind slab development on lee terrain steeper than 35 degrees. Last week, the wind was brutal and created sensitive slabs on a variety of lee terrain. While these slabs have had a few days to heal, they now have a lot more weight on them and can still be triggered if you hit the right spot. Cross loaded pockets and terrain convexity are places where one of these could pull out.<o></o>
A secondary concern is the storm snow where it has formed a slab on terrain steeper than 35 degrees. Temperatures have been pretty cool during this storm so the newest snow hasn’t yet formed a slab in most areas. It will as settlement occurs especially once temperatures rise again.<o></o>
Of course with all the fresh powder out there, it will be easy to get a good size loose snow avalanche to slough off the steepest terrain which could add enough weight to step down to deeper weaknesses.<o></o>
<o></o>
Weather and Avalanche Forecast<o></o>
The recent surge of moisture is expected to diminish today as a short lived high pressure system builds over the area. Weather models indicate that another air mass and snow event will impact the area Thursday possibly lasting through the weekend.<o></o>
I expect the avalanche danger to remain similar but will increase rapidly to HIGH on leeward terrain if the wind starts moving snow around. Warmer conditions will also increase the avalanche danger but that is not in the near term weather forecast.<o></o>
Conditions are about as good as it gets. We are in the cautionary area where stability appears to be pretty good but there’s still enough concern about some of the steeper lee terrain to keep your situational awareness operating at a high level. Don’t take chances that may get you or someone else in trouble. We’re seeing far to many You Tube videos of skiers and snowmobilers on steep terrain together. There have been some unfortunate accidents recently where more than 1 person was caught.<o></o>
They only way you or your partners will have a chance at surviving a burial is to make certain only one person at a time is exposed.<o></o>
Have a great time but play it safe out there! I will issue the next avalanche advisory this Friday, February 28.<o></o>
<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Tuesday, February 25th, 2014 at 6:21 am
Categories: Advisories<o
></o><o></o>The avalanche danger is CONSIDERABLE on wind loaded terrain above 5000 feet that is steeper than 35 degrees.<o
></o>Natural avalanches are possible, human triggered avalanches are likely. Careful snowpack evaluation, cautious route finding and conservative decision making is essential on leeward terrain.<o
></o>On all other terrain in the west central Montana backcountry, the avalanche danger is MODERATE. <o
></o>Heightened avalanche conditions can be found on steeper terrain in areas where deeply buried weak faceted snow exists. Snow and terrain must be evaluated carefully to identify these areas of concern.<o
></o>Good morning! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday February 25. This information is the responsibility of the Forest Service and does not apply to operating ski areas. The danger rating expires at midnight tonight.<o
></o><o
></o>Weather and Snowpack<o
></o>A major winter storm impacted western Montana during the past few days bringing February snow totals in the valleys to near record levels. SNOTEL data indicates that many valley locations picked up significantly more snow than many mountain locations. The mountains indeed have received plenty of new snow and conditions appear to be surprising stable.<o
></o>Mountain temperatures this morning are in the teens and winds are light from the north and northeast.<o
></o>SNOTEL stations report about .50 inches of snow water equivalent (SWE) or over 6 inches new snow in the past 12 hours.<o
></o>We’ve received no reports of avalanche activity, natural or otherwise, during the past 4 days. The Snowbowl Ski Patrol did initiate several soft slabs using explosives during morning avalanche control Monday. This involved mostly the newest snowfall from the previous 24 hours. I would expect they are finding similar conditions this morning.<o
></o>In both the Lolo Pass and Rattlesnake backcountry avalanche specialists were pleasantly surprised at how much the stability has improved. The overall snowpack appears to have adjusted well to the new load. No cracking or collapse noise was experienced in either area and stability test scores were high with no propagation.<o
></o>During a Level 1 class in the Rattlesnake this past weekend, instructors reported that stability test scores increased through the weekend. The now deeply buried facet layer still fails cleanly in some pits, but it takes a lot of force to get it to fail and it does not propagate like it did last week. You can view the snow profiles for the Rattlesnake and Lolo Pass backcountry on our 2013/14 Snow Profiles page.<o
></o>The primary avalanche problem today is wind slab development on lee terrain steeper than 35 degrees. Last week, the wind was brutal and created sensitive slabs on a variety of lee terrain. While these slabs have had a few days to heal, they now have a lot more weight on them and can still be triggered if you hit the right spot. Cross loaded pockets and terrain convexity are places where one of these could pull out.<o
></o>A secondary concern is the storm snow where it has formed a slab on terrain steeper than 35 degrees. Temperatures have been pretty cool during this storm so the newest snow hasn’t yet formed a slab in most areas. It will as settlement occurs especially once temperatures rise again.<o
></o>Of course with all the fresh powder out there, it will be easy to get a good size loose snow avalanche to slough off the steepest terrain which could add enough weight to step down to deeper weaknesses.<o
></o><o
></o>Weather and Avalanche Forecast<o
></o>The recent surge of moisture is expected to diminish today as a short lived high pressure system builds over the area. Weather models indicate that another air mass and snow event will impact the area Thursday possibly lasting through the weekend.<o
></o>I expect the avalanche danger to remain similar but will increase rapidly to HIGH on leeward terrain if the wind starts moving snow around. Warmer conditions will also increase the avalanche danger but that is not in the near term weather forecast.<o
></o>Conditions are about as good as it gets. We are in the cautionary area where stability appears to be pretty good but there’s still enough concern about some of the steeper lee terrain to keep your situational awareness operating at a high level. Don’t take chances that may get you or someone else in trouble. We’re seeing far to many You Tube videos of skiers and snowmobilers on steep terrain together. There have been some unfortunate accidents recently where more than 1 person was caught.<o
></o>They only way you or your partners will have a chance at surviving a burial is to make certain only one person at a time is exposed.<o
></o>Have a great time but play it safe out there! I will issue the next avalanche advisory this Friday, February 28.<o
></o><o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
></o>
Avalanche Advisory for February 28, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
This entry was posted on Friday, February 28th, 2014 at 6:54 am
Categories: Advisories<o></o>
<o></o>
The current avalanche danger is MODERATE, or Level 2, on all terrain above 5000 feet in the west central Montana backcountry. Heightened avalanche conditions can be found on some terrain features, natural avalanches are unlikely but human triggered avalanches are possible.<o></o>
This moderate rating may be short lived as a BLIZZARD WARNING has been issued by the Missoula Office of the National Weather Service. We are watching this develop and may raise the danger rating if necessary.<o></o>
If you get out in the backcountry, send us a quick email or a detailed observation. Your information is highly valued during transitional periods like we’re experiencing now. We will respect any desire to remain anonymous, we just want the information.<o></o>
Hello! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Friday, February 28, 2014. The avalanche danger rating expires at midnight tonight. The USDA Forest Service is solely responsible for the content of this advisory.<o></o>
<o></o>
Weather and Snowpack<o></o>
This is certainly shaping up to be a memorable late February.<o></o>
This morning, SNOTEL stations report about a half inch of snow water accumulation in the past 24 hours with the Stuart Peak station reporting 1.6 inches. Snowbowl reports 14 inches of new snow this morning.<o></o>
Locations north of Missoula are under the influence of the arctic air spilling over the Continental Divide this morning and temperatures are in the low teens and dropping at both Stuart Peak and North Fork Jocko SNOTEL stations. Bitterroot range SNOTEL temperatures remain near 30 degrees with much less snow accumulation. Rain was reported up to 7500 feet yesterday in the Bitterroot.<o></o>
At 5 am, the wind at Point Six is from the east at 6mph gusting to 10 and out of the west. At the Deer Mountain RAWS station, the wind is out of the west at 13 gusting to 20 mph.<o></o>
Skies cleared Tuesday and we were given a 2 day respite in the snow. Temperatures responded quickly to solar heating on most sun exposed aspects with SNOTEL stations reporting high temperatures into the forties by Tuesday and Wednesday afternoons. We received a few reports of minor loose snow point release avalanches in the Swan and Bitterroot ranges on steep aspects affected by solar heating.<o></o>
The overall snowpack has adjusted well to last weeks new load and people are skiing and riding onto steeper terrain. Warmer temperatures further settled this new snow but also left a thin sun crust on most aspects on the south half of the compass. Locations that received rain yesterday now have a rain crust.<o></o>
We have not received any reports of widespread avalanche activity or reports of the usual clues of unstable conditions in the past 48 hours.<o></o>
A thin layer of surface hoar formed on this sun crust in some sheltered areas Wednesday night before cloud cover moved in.<o></o>
Observations from the Bitterroot, the Rattlesnake and the Seeley Lake area indicate mostly stable conditions. The area of most concern in all the profiles is how well this upper level feature adjusts to the storm slab currently forming.<o></o>
The primary avalanche problem today is new storm snow slab development on the sun crust or rain crusts on slopes steeper than 35 degrees. East to southwest aspects are suspect but it should be pretty easy to stick your arm down into the snow to see if the crust is present.<o></o>
Another avalanche problem to be aware of is wind slab development. Mountain winds have been mostly calm through this morning but the weather models say this is about to change, with a vengeance. Arctic air is spilling over the divide this morning with increasing winds from the east. This scenario loads unusual places so it will be possible to find wind slab and cornice development opposite from the expected places.<o></o>
Cornices have grown with each storm and are pretty sensitive now. Many cornices have collapsed naturally in all areas after the last storm. They deserve a wide berth.<o></o>
The more deeply buried facet/crust that we’ve been describing continues to gain strength but in areas with shallow snow cover, it is still producing clean failures when a lot of force is applied. It does not propagate as it did 2 weeks ago, but it must not be ruled out as a potential problem in areas that have less than 4 feet of snow.<o></o>
<o></o>
Weather and Avalanche Forecast<o></o>
We are currently under a BLIZZARD WARNING for the entire area. 6-8 inches of new snow is expected with this storm with 60 mph winds. Wind direction will be N-NE at the peak of the storm returning to a more westerly direction as the storm subsides Saturday.<o></o>
Expect the avalanche danger to increase, possibly to HIGH avalanche danger levels, through the weekend. Any leeward terrain, especially the more southern aspects that have a sun crust, will have dangerous wind slab formations.<o></o>
This is what we live for! Enjoy it while it lasts, but do so in a way that you live to do it again. Have a safe weekend!<o></o>
Dudley Improta will issue the next advisory on March 4, 2014.<o></o>
This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o></o>
--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o></o>
fficeffice" /><o></o>This entry was posted on Friday, February 28th, 2014 at 6:54 am
Categories: Advisories<o
></o><o></o>The current avalanche danger is MODERATE, or Level 2, on all terrain above 5000 feet in the west central Montana backcountry. Heightened avalanche conditions can be found on some terrain features, natural avalanches are unlikely but human triggered avalanches are possible.<o
></o>This moderate rating may be short lived as a BLIZZARD WARNING has been issued by the Missoula Office of the National Weather Service. We are watching this develop and may raise the danger rating if necessary.<o
></o>If you get out in the backcountry, send us a quick email or a detailed observation. Your information is highly valued during transitional periods like we’re experiencing now. We will respect any desire to remain anonymous, we just want the information.<o
></o>Hello! This is Steve Karkanen with the West Central Montana Avalanche Center’s avalanche advisory for Friday, February 28, 2014. The avalanche danger rating expires at midnight tonight. The USDA Forest Service is solely responsible for the content of this advisory.<o
></o><o
></o>Weather and Snowpack<o
></o>This is certainly shaping up to be a memorable late February.<o
></o>This morning, SNOTEL stations report about a half inch of snow water accumulation in the past 24 hours with the Stuart Peak station reporting 1.6 inches. Snowbowl reports 14 inches of new snow this morning.<o
></o>Locations north of Missoula are under the influence of the arctic air spilling over the Continental Divide this morning and temperatures are in the low teens and dropping at both Stuart Peak and North Fork Jocko SNOTEL stations. Bitterroot range SNOTEL temperatures remain near 30 degrees with much less snow accumulation. Rain was reported up to 7500 feet yesterday in the Bitterroot.<o
></o>At 5 am, the wind at Point Six is from the east at 6mph gusting to 10 and out of the west. At the Deer Mountain RAWS station, the wind is out of the west at 13 gusting to 20 mph.<o
></o>Skies cleared Tuesday and we were given a 2 day respite in the snow. Temperatures responded quickly to solar heating on most sun exposed aspects with SNOTEL stations reporting high temperatures into the forties by Tuesday and Wednesday afternoons. We received a few reports of minor loose snow point release avalanches in the Swan and Bitterroot ranges on steep aspects affected by solar heating.<o
></o>The overall snowpack has adjusted well to last weeks new load and people are skiing and riding onto steeper terrain. Warmer temperatures further settled this new snow but also left a thin sun crust on most aspects on the south half of the compass. Locations that received rain yesterday now have a rain crust.<o
></o>We have not received any reports of widespread avalanche activity or reports of the usual clues of unstable conditions in the past 48 hours.<o
></o>A thin layer of surface hoar formed on this sun crust in some sheltered areas Wednesday night before cloud cover moved in.<o
></o>Observations from the Bitterroot, the Rattlesnake and the Seeley Lake area indicate mostly stable conditions. The area of most concern in all the profiles is how well this upper level feature adjusts to the storm slab currently forming.<o
></o>The primary avalanche problem today is new storm snow slab development on the sun crust or rain crusts on slopes steeper than 35 degrees. East to southwest aspects are suspect but it should be pretty easy to stick your arm down into the snow to see if the crust is present.<o
></o>Another avalanche problem to be aware of is wind slab development. Mountain winds have been mostly calm through this morning but the weather models say this is about to change, with a vengeance. Arctic air is spilling over the divide this morning with increasing winds from the east. This scenario loads unusual places so it will be possible to find wind slab and cornice development opposite from the expected places.<o
></o>Cornices have grown with each storm and are pretty sensitive now. Many cornices have collapsed naturally in all areas after the last storm. They deserve a wide berth.<o
></o>The more deeply buried facet/crust that we’ve been describing continues to gain strength but in areas with shallow snow cover, it is still producing clean failures when a lot of force is applied. It does not propagate as it did 2 weeks ago, but it must not be ruled out as a potential problem in areas that have less than 4 feet of snow.<o
></o><o
></o>Weather and Avalanche Forecast<o
></o>We are currently under a BLIZZARD WARNING for the entire area. 6-8 inches of new snow is expected with this storm with 60 mph winds. Wind direction will be N-NE at the peak of the storm returning to a more westerly direction as the storm subsides Saturday.<o
></o>Expect the avalanche danger to increase, possibly to HIGH avalanche danger levels, through the weekend. Any leeward terrain, especially the more southern aspects that have a sun crust, will have dangerous wind slab formations.<o
></o>This is what we live for! Enjoy it while it lasts, but do so in a way that you live to do it again. Have a safe weekend!<o
></o>Dudley Improta will issue the next advisory on March 4, 2014.<o
></o>This information is the sole responsibility of the Forest Service and does not apply to operating ski areas. The avalanche danger rating expires at midnight tonight but you can use the information we provide to help you make more informed decisions regarding travel in avalanche terrain for the next few days.
Our advisory area includes the Bitterroot Mountains from Lost Trail Pass North to Hoodoo Pass, the Rattlesnake Mountains and the Southern Swan and Mission Mountains near Seeley Lake. Avalanche information for the Lookout Pass/St. Regis Basin is available from the Idaho Panhandle Avalanche Center. <o
></o>--
West Central Montana Avalanche Center
Lolo National Forest
Bldg. 24a Fort Missoula Rd.
Missoula, MT 59804
406-329-3752 cell 406-370-3371
info@missoulaavalanche.org<o
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