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2013-14 west central MT avalanche advisories

Special Avalanche Information for March 1, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Saturday, March 1st, 2014 at 7:31 am
Categories:
Advisories<o:p></o:p>
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High winds and continued heavy snowfall have created HIGH AVALANCHE DANGER conditions in the Rattlesnake and the southern Swan and Mission Mountains north of Missoula. This special update also includes the foothills areas close to Missoula as well as Mount Jumbo and Mount Sentinel. The avalanche danger is HIGH on any open slope steeper than 30 degrees.<o:p></o:p>
The avalanche danger in the Bitterroot mountains on wind loaded terrain steeper than 30 degrees is CONSIDERABLE. South facing slopes here also developed a sun crust earlier this week so with east to north winds expect these aspects to get loaded. <o:p></o:p>
AVALANCHE ACCIDENT<o:p></o:p>
Strong east winds and heavy snowfall associated with a blizzard in the Missoula valley have created very dangerous avalanche conditions on Mount Jumbo, Mount Sentinel and other steep open slopes close to Missoula. A large slab avalanche was triggered by a snowboarder near the top of Mount Jumbo yesterday afternoon. The avalanche ran to the valley floor, destroyed two homes and buried 3 people. A large rescue effort consisting of local first response teams, law enforcement, Search and Rescue personnel and at least 100 nearby residents quickly mobilized to assist with search efforts. All 3 victims were found alive and transported to local hospitals.<o:p></o:p>
The City of Missoula Police and Fire Departments are conducting an investigation into this tragic event.<o:p></o:p>
Our thoughts are with them and their families hoping for a speedy and full recovery. Many thanks to everyone involved in this complicated rescue.<o:p></o:p>
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Weather and Snow<o:p></o:p>

Warm temperatures and sun Tuesday and Wednesday created a hard ice crust which is now a perfect bed surface for avalanches. Blizzard conditions in the valley have formed sensitive storm slabs and wind slabs on a variety of aspects. Any open terrain steeper than 30 degrees that has been recently loaded should be avoided. Many people reported to us Friday that they triggered wind slabs and experienced collapse and fracture propagation in areas loaded by the wind on Mount Sentinel.<o:p></o:p>
It has been many years since Missoula has seen a full-on blizzard with this much snow. High winds are expected again today and will continue to load these low elevation slopes. Please respect these conditions and avoid Mount Jumbo and the steeper slopes of Mount Sentinel for a few days.<o:p></o:p>
The backcountry of the Bitterroot Mountains has not received the heavy snowfall seen in the Rattlesnake or Missoula valley. Mountain winds have been fairly calm until late yesterday when east winds reached the higher elevations. This morning on Point Six, east winds are topping out at 61 mph! The temperature is -21 for a wind chill value in the negative 60 degree range. I would expect to see high ridgetop winds throughout the Bitterroot today as this arctic air takes hold.<o:p></o:p>
Weather and Avalanche Forecast<o:p></o:p>

The Weather Service is forecasting east winds of up to 50 mph to continue thru this morning. The heavy snow has moved out of the area but we can expect ANOTHER round of heavy snowfall starting Sunday night. This storm may be much wetter and warmer than what we current have which will only make avalanche danger conditions worsen.<o:p></o:p>
The next regular avalanche advisory will be issued by Dudley Tuesday morning however we will post information updates as needed.<o:p></o:p>
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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:p></o:p>


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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:p></o:p>
 
Avalanche Advisory March 4, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Tuesday, March 4th, 2014 at 6:34 am
Categories: Advisories
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<o:p></o:p>
The avalanche danger is CONSIDERABLE in the West Central Montana backcountry on slopes 30 degrees and steeper. New, heavy, wet, snow has loaded steep slopes in the area. We aren’t on an area-wide avalanche warning, but make no mistake; there is some very touchy snow out there. Any rain on the snow and all bets are off; the rain’s immediate effect will make the snow less stable.<o:p></o:p>
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for March 4, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight (March 4).<o:p></o:p>
We are saddened to hear of the passing of one of the people caught in the avalanche on Mt. Jumbo in Missoula on February 28. Our thoughts and condolences go out to the family and friends.<o:p></o:p>
Weather and Snowpack Analysis<o:p></o:p>
Westerly winds are blowing in the 20mph range at higher elevations this morning. Mountain temperatures are warm, ranging in the high twenties to low thirties. The area picked up several inches of snow last night; 5 inches in the southern Bitterroot, 4 inches in the Rattlesnake, 7 inches at Hoodoo Pass. This new snow is likely heavy and wet. We are currently under a winter weather advisory.<o:p></o:p>
Travis and I traveled in the Rattlesnakes yesterday and found a wildly variable snowpack. The northerly aspects appeared fairly stable (Rattlesnakes pit profile) while the south sides are loaded and reactive (Rattlesnakes video). Northerly winds loaded the south slopes in the Rattlesnakes and the new, relatively heavier, snow is sitting on a crust and colder snow. On March 2<SUP>nd</SUP> the Snowbowl Patrol, using explosives, triggered slabs, up to 20 inches in depth in southwest couloirs.<o:p></o:p>
Tim and Dave also found heavy, wet snow sitting on colder snow near Lolo Pass yesterday. (Lolo Pass pit profile). All the steep road cuts near Lolo Pass were naturally sliding.<o:p></o:p>
I got a call from the Yurtski guides (Southern Swans) March 2. Although their pits were showing fairly stable results; they were remaining cautious of wind-loaded areas. The winds there, as we found in the Rattlesnake, have loaded slopes that are not the usual suspects.<o:p></o:p>
Parts of I-90 near St. Regis were closed yesterday afternoon due to rain-induced wet slides.<o:p></o:p>
Missoula Foothills Special Statement<o:p></o:p>
In the foothills surrounding Missoula there is HIGH avalanche danger in basins and gullies steeper than 30 degrees.<o:p></o:p>
The heightened avalanche danger in the Missoula foothills is due to rain on unstable snow in the basins and gullies. Dave and I investigated the crown of the Mt. Jumbo avalanche Sunday and had unstable results with snow tests (Mt. Jumbo Crown profile) and collapsing of wind-loaded areas.<o:p></o:p>
Weather Forecast and Avalanche Outlook<o:p></o:p>
A warming pattern should remain through the week. Perhaps some significant snow will develop today over the mountains with off and on showers into Friday. The snow predicted will be heavy and wet; with possible rain up to 6000 feet. The warmer, heavier snow may settle quickly; but the immediate effect of a heavy load, or rain, will destabilize the snowpack.<o:p></o:p>
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 .<o:p></o:p>
Ski and ride safe.<o:p></o:p>
I will issue the next advisory on Friday, March 7.<o:p></o:p>
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:p></o:p>

<o:p> </o:p>
--

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:p></o:p>




 
Avalanche Warning for March 6, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Thursday, March 6th, 2014 at 8:21 am
Categories: Advisories
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A BACKCOUNTRY AVALANCHE WARNING is in effect for West Central Montana.<o:p></o:p>
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:p></o:p>
The avalanche danger is HIGH. Dangerous avalanche conditions exist. Natural avalanches are likely, human triggered avalanches are very likely. Terrain 30 degrees and steeper is capable of natural avalanching. Avalanche paths and runout zone should be avoided.<o:p></o:p>
Good morning. This is Dudley Improta with this special statement form the West Central Montana Avalanche Center. 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 (March 6). I will issue the regularly scheduled avalanche advisory tomorrow morning.<o:p></o:p>
Weather and Snowpack Analysis<o:p></o:p>
Heavy, wet snow has loaded steep slopes in the area. High elevation winds are gusting above 50mph. Snotels are showing 1 to 1.7 inches of accumulated snow water over the last 24 hours.<o:p></o:p>
The snowpack will be unstable today. Natural avalanches are likely. Travel in the backcountry will be difficult, as well as possibly dangerous, with the heavy snow. Rain may fall above 6000 feet. The immediate effect of the rain will destabilize the snowpack.<o:p></o:p>
The area is under a winter weather advisory.<o:p></o:p>
Weather Forecast and Avalanche Outlook<o:p></o:p>
Moderate to heavy rain and, in the higher elevations, snow is expected to continue through this morning. Snow levels may lower today. Tonite, snow levels should drop back to 4000 feet and allow more accumulation in the mountains. Drier air may work its way into the area on Friday.<o:p></o:p>
If I elected to venture out today; I would avoid steep slopes.<o:p></o:p>
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 .<o:p></o:p>
Ski and ride safe.<o:p></o:p>
I will issue the regular advisory tomorrow morning Friday, March 7.<o:p></o:p>
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.<o:p></o:p>
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.-

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:p></o:p>
 
Avalanche Advisory March 7, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Friday, March 7th, 2014 at 6:35 am
Categories: Advisories
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The avalanche danger is CONSIDERABLE in the West Central Montana backcountry on slopes 30 degrees and steeper. We have rescinded the avalanche warning from yesterday; but there is still potential to trigger a slide on steep slopes.<o:p></o:p>
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for March 7, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight (March 7).<o:p></o:p>
Weather and Snowpack Analysis<o:p></o:p>
Westerly winds are blowing in the 20mph range and gusting in the 30′s at higher elevations this morning. Mountain temperatures are in the high 20′s to low 30′s (F). The area picked up 2 to 4 inches of snow ovenight.<o:p></o:p>
The snow in the Rattlesnakes is still a bit fickle. On Monday we found unstable snow on southeast slopes; we went 700 feet higher yesterday; the snow was gaining strength but propagating in tests on north slopes (video). The south slopes, at a higher elevation, seemed more stable(Rattlesnakes pit profile). I would check for instability before recreating on any aspect in the Rattlesnakes.<o:p></o:p>
Tim and Dave traveled near Lolo Pass and reported a wet and unsupported snowpack up to 6000’ (Lolo Pass pit profile). They felt any cold temperatures would help solidify the snow. Travel will be difficult and it may be possible to trigger a deep wet slide until we see the cool temperatures.<o:p></o:p>
A report from Downing Mountain lodge reported a heavy load from the week’s storms as well. Their main concern is the continued wind-loading on north and northeast slopes.<o:p></o:p>
Geoff Fast and Ed Snook had unstable results with pit tests about 65 cm into the snowpack (Lost Trail pit profile); much the same problem we saw in the Rattlesnake. This layer could be easily triggered at elevations above 6500 feet.<o:p></o:p>
So, we have a few different chances to trigger an avalanche; relatively heavy snow from the week’s storms sitting on colder snow at higher elevations and weaknesses associated with rain and wet snow below 6500 feet (glide avalanche snowbowl road 3/6/14) . Don’t be lulled into complacency by a little sun; pay close attention if you are considering riding or skiing any aspect over 30 degrees in steepness.<o:p></o:p>
Weather Forecast and Avalanche Outlook<o:p></o:p>
Snow and snow levels are expected to decrease this morning. High pressure should develop over the region tonight and last through Sunday. Daytime temperatures may warm lower and mid-elevations; particularly on south-facing slopes. I would expect snow stability to improve ever so slightly. Over the weekend, I would definitely check for instabilities with observations and snow pits before committing to any slopes over 30 degrees.<o:p></o:p>
Cheers for Charity – Draught Works – 915 Toole Avenue in Missoula – March 18 – 5pm<o:p></o:p>
Missoulaavalanche is being sponsored at Draught Works on March 18 with “Cheers for Charity”. Come on down and have a pint. The event will help raise a few bucks for the West Central Montana Avalanche Center.<o:p></o:p>
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 .<o:p></o:p>
Ski and ride safe; have a great weekend!<o:p></o:p>
Steve will issue the next advisory on Tuesday, March 11, 2014.<o:p></o:p>
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Avalanche Advisory March 11, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Tuesday, March 11th, 2014 at 6:02 am
Categories: Advisories
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The avalanche danger is CONSIDERABLE in the West Central Montana backcountry on slopes 30 degrees and steeper. Over the past two days; heavy, wet snow and rain have loaded steep slopes in the advisory area<o:p></o:p>
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for March 11, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight (March 11).<o:p></o:p>
Weather and Snowpack Analysis<o:p></o:p>
This morning, northwest mountain winds are blowing 10 to 16 mph and gusting into the 20’s. High elevation temperatures are in the twenties (F). New snow accumulations are from 5 to 7 inches in the Southern Swans, Southern Missions and Rattlesnakes; to 3 to 4 inches in the Central Bitterroot and Southern Bitterroot. The southern part of the advisory area is under a winter storm watch until 9am.<o:p></o:p>
Wet snow has accumulated in the mountains over the last couple of days; rain levels have reached above 6000 feet. The quick shot of sun on Saturday was enough to leave a thin crust, except on the northerly aspects. Storm layers on cold snow from last week are gaining strength; but reports from the Central Bitterroots and the Rattlesnakes indicate weak snow within a foot of the surface.<o:p></o:p>
Even with pit tests strengthening; there is enough new weight from the last two day’s rain and snow to keep us at CONSIDERABLE today. Last night’s snow came in with colder temperatures which is a good thing for future stability.<o:p></o:p>
Another concern is cornice failure. We got a report of human triggered cornices in the Brushy Fork of Lolo on March 8 (photo). Cornices are large and weighted by the last week’s heavy snow and rain at higher elevations. The sunshine predicted for this week may tip the scales and cause some failures.<o:p></o:p>
Weather Forecast and Avalanche Outlook<o:p></o:p>
Snow over the last week (where it didn’t rain) came in under relatively warm temperatures. This is the type of snow that should settle quickly. I do expect the chances for cornice failure to rise with the anticipated sunny days.<o:p></o:p>
This afternoon, temperatures will keep cooling as high pressure builds over the area through the week. A slight disturbance on Thursday is not expected to produce much precipitation. Enjoy the high pressure if you can, because mountain snow and valley rain should move back in Friday.<o:p></o:p>
Missoula County Search and Rescue <o:p></o:p>
Missoula County Search and Rescue responded to the devastating avalanche off Mt. Jumbo, assisting initial response from the Missoula Fire Department, on February 28. They then responded to lost skiers up Grant Creek near the Snowbowl Ski Area that same evening. Not only did they respond, more than 12 members worked at Mt. Jumbo; and when all were accounted for; went to Grant Creek to search for skiers who, unlike the victims of Mt. Jumbo, chose to participate in an activity with hazards.<o:p></o:p>
Our local Search and Rescue deserves acknowledgement and thanks.<o:p></o:p>
Cheers for Charity – Draught Works – 918 Toole Avenue – March 18 – 5pm<o:p></o:p>
Missoulaavalanche is being sponsored at Draught Works on March 18 with “Cheers for Charity”. Come on down and have a pint. The event will help raise a few bucks for the West Central Montana Avalanche Center.<o:p></o:p>
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 .<o:p></o:p>
Ski and ride safe; have a good week.<o:p></o:p>
We will issue the next advisory on Friday, March 14, 2014.<o:p></o:p>
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:p></o:p>

<o:p> </o:p>
--

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:p></o:p>





 
Avalanche Advisory for March 18, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Tuesday, March 18th, 2014 at 6:49 am
Categories:
Advisories<o:p></o:p>
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The avalanche danger in the west central Montana backcountry is MODERATE.<o:p></o:p>
Natural avalanches are unlikely, human triggered avalanches are possible.<o:p></o:p>
It will be possible to trigger an avalanche on recently wind loaded slopes steeper than 35 degrees near ridges.<o:p></o:p>
Cornices are sensitive now and can’t be trusted. It is also possible to trigger a much larger avalanche in shallow rocky terrain where weak snow exists at the bottom of the snowpack.<o:p></o:p>
Good morning! This is Steve Karkanen with the Tuesday backcountry avalanche advisory provided by the West Central Montana Avalanche Center. The avalanche danger rating expires tonight at midnight. This information is the responsibility of the Forest Service and does not apply to operating ski areas.<o:p></o:p>
Special Announcement:<o:p></o:p>
A celebration of Peter Maxwell’s life is being held at 4 pm today at Caras Park in downtown Missoula. Our thoughts and prayers are with Peter’s family and friends during this difficult time.<o:p></o:p>
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Weather And Snowpack<o:p></o:p>

A quick moving storm passed through western Montana Monday dropping several inches of snow in most mountain locations. SNOTEL sites recorded 6-10 inches of new snow in the past 24 hours. This morning, mountain temperatures are in the 20′s and northerly winds are 27 mph at Point Six and 12 mph at the Deer Mountain RAWS station at 7200 feet near Darby, MT.<o:p></o:p>
Travis and Dudley toured an area near Lolo Pass yesterday and found fair stability conditions (view profile) with wind loading being their primary concern. They also indicated that wet slab avalanche activity will become a problem during warm, sunny days or if it rains.<o:p></o:p>
The primary avalanche problem today is wind slab formation in areas where high winds pummeled the ridges. Wind speeds during the storm yesterday were in the 30-40 mph range. Snow plumes were seen in the Bitterroot peaks Sunday and Monday so any available snow was obviously getting moved around.<o:p></o:p>
A secondary avalanche problem, very much related to the first, is the cornice build up of the past few weeks. We’ve seen and have received reports of cornice collapse triggering avalanches in the Bitterroot and Rattlesnake recently.<o:p></o:p>
These 2 creatures of the wind deserve the same level of respect a Grizzly bear commands. Similar to the great bear, cornices and fresh wind loaded terrain are an awesome sight, but you don’t want to get to close to, or jump on one. Give these features a wide berth especially during warm sunny weather.<o:p></o:p>
The weather of the past few days has been exactly what is expected for mid-March in the northern Rockies. The best powder skiing of the winter can be in March but you must be quick and hope the sun stays hidden by cloud cover. As soon as the sun hits any slope, the snow turns to glop and wants to start moving to the Pacific Ocean.<o:p></o:p>
On warm days, pay close attention to how the sun is affecting stability. Visual clues such as pinwheels and small point release avalanches are indicators of changing stability. Move onto more shaded terrain and avoid being on or under steep open terrain.<o:p></o:p>
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Weather and Avalanche Forecast<o:p></o:p>

The Missoula Weather Service is forecasting scattered mountain snow showers to persist today with a strong weather disturbance expected to enter the area Wednesday and Thursday. Up to 6 inches of new snow is expected with this system. Additional new snowfall and wind will increase the avalanche danger to CONSIDERABLE on wind loaded terrain. Clear skies will rapidly raise the avalanche danger on any steep sun exposed slope steeper than 35 degrees.<o:p></o:p>
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Benefit for Missoulaavalanche<o:p></o:p>

The past 2 weeks have been an exceptional challenge for us. We have been involved with the Mount Jumbo and more recently the Altoona Lakes avalanche investigations. Both are outside our advisory areas and in both cases, the responsible agencies asked for our assistance.<o:p></o:p>
The Mount Jumbo avalanche was a rare event, but one that required an unusual amount of involvement from us. An on-going avalanche hazard to a residential area required our daily attention, which we responded to.<o:p></o:p>
We will continue to assist the City, and other agencies, with avalanche hazard assessment when the need arises. Our ability to do this is highly dependent on the support we receive from you.<o:p></o:p>
We receive NO direct financial assistance from the Forest Service, which is our host agency. 100% of our operating budget comes from donations to the non-profit, West Central Montana Avalanche Foundation.<o:p></o:p>
Please consider a tax-deductible donation to this organization.<o:p></o:p>
Tonight, at 5-10pm, Draught Works, 915 Toole Street, is sponsoring a Cheers for Charity event for the West Central Montana Avalanche Foundation. A portion of the proceeds from this event will go directly back into the community in the form of avalanche advisories and avalanche classes. Hope to see you there!<o:p></o:p>
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Mount Jumbo and Altoona Lakes Avalanche Reports.<o:p></o:p>

A preliminary report on the Mount Jumbo avalanche is available for viewing on our Accidents page. This report will be updated as more information is made available to us.<o:p></o:p>
A report on the Altoona Lakes avalanche is nearly complete and will be posted in the next few days.<o:p></o:p>
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If you get out, send an observation to our Public Observations page. You can also send a short email to info@missoulaavalanche.org. Your information is helpful and helps people make more informed decisions.<o:p></o:p>
I will issue the next advisory this Friday, March 21. Please be safe out there!<o:p></o:p>
<o:p></o:p>
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:p></o:p>


--

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:p></o:p>
 
Avalanche Advisory for March 21, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Friday, March 21st, 2014 at 6:08 am
Categories:
Advisories<o:p></o:p>
<o:p></o:p>
The avalanche danger is MODERATE in the west central Montana backcountry.<o:p></o:p>
Natural avalanches are unlikely but human triggered avalanches are possible. Heightened avalanche conditions exist on steep, recently wind loaded terrain at the higher elevations.<o:p></o:p>
Carefully evaluate snow, weather and terrain as conditions can change dramatically over short periods of time and distance.<o:p></o:p>
Hello! This is Steve Karkanen at the West Central Montana Avalanche Center with the avalanche advisory for Friday, March 21. The avalanche danger rating expires at midnight tonight and does not apply to operating ski areas.<o:p></o:p>
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Snow and Weather<o:p></o:p>

Since Tuesday, SNOTEL sites have picked up an average of .50″ of SWE or about 5″ new snow with temperatures staying cool. This morning, mountain temperatures are in the teens and winds have calmed with both the Point Six and Deer Mountain RAWS stations reporting west winds at 9 mph.<o:p></o:p>
The primary avalanche problem in the west central Montana backcountry is wind slab formation on any lee terrain steeper than 35 degrees. These wind slabs are being reported on multiple aspects and in areas further down slope that have been cross loaded by high winds earlier this week.<o:p></o:p>
A secondary problem is loose snow sloughing off the hard old snow surface on steeper terrain.<o:p></o:p>
Cornices are huge and can’t be trusted. They have a nasty habit of breaking farther back than expected so give them a wide berth.<o:p></o:p>
Yesterday, Ed and Casey were in the southern Bitterroot near Lost Trail and they report mostly stable conditions with wind slabs and cornices being the main concerns.<o:p></o:p>
We received a report from Blake at Downing Mountain Lodge Wednesday who gave a great description of the wind slab problem on some of the terrain in the Central Bitterroot earlier this week.<o:p></o:p>
Tim and Dave rode into the Brushy Fork area on the MT/ID line and were able to tour to a site near Rocky point . They also describe conditions as being mostly stable with recent wind slabs and cornices being the primary avalanche problem.<o:p></o:p>
Al and Dan rode out to Hoodoo Pass yesterday and sent a report on conditions there. Like many other western Montana locations, a significant avalanche cycle occurred in this area within the past two weeks. You can view the photos of the slide path at Gully’s and see the equally impressive amount of total snow in Al’s profile.<o:p></o:p>
In the Rattlesnake, wind gusting to 45 mph from the W-SW was moving snow throughout the day. Travis and Logan reported the main avalanche problem here is wind slab formation mostly on east facing terrain with cross loading on the south aspects. In sheltered areas, new snow on a sun crust was reactive and will easily slough on steeper slopes. View the Rattlesnake profile here.<o:p></o:p>
<o:p></o:p>
Weather and Avalanche Forecast<o:p></o:p>

The National Weather Service Forecast Office in Missoula is tracking an arctic air mass that will impact much of western Montana this weekend. The main impact will be north and east of our advisory area but we can expect colder temperatures and higher winds this weekend. The Seeley Lake area may see as much as 6 inches of new snow by late Saturday with smaller amounts in the Bitterroot mountains.<o:p></o:p>
I don’t expect much change in the overall avalanche danger unless the mountains receive higher snowfall amounts with wind this weekend. Wind slabs are the main issue now and will continue to be a factor for several days.<o:p></o:p>
<o:p></o:p>
Mount Jumbo and Altoona Lakes Avalanche Reports.<o:p></o:p>

A preliminary report on the Mount Jumbo avalanche is available for viewing on our Accidents page. This report will be updated as more information is made available to us.<o:p></o:p>
A report on the Altoona Lakes avalanche is now complete and available for viewing.<o:p></o:p>
<o:p></o:p>
If you get out, send an observation to our Public Observations page. You can also send a short email to info@missoulaavalanche.org. Your information is helpful and helps people make more informed decisions.<o:p></o:p>
The Draught Works Cheers For Charity event last Tuesday evening was a great success. Thank You!<o:p></o:p>
A special thanks goes out to those who were involved with or who know people who are involved in the Mount Jumbo and Altoona Lakes avalanches. This has been a tough time and our thoughts are with you.<o:p></o:p>
Dudley will issue the advisory on Tuesday March 25.<o:p></o:p>
<o:p></o:p>
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:p></o:p>


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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:p></o:p>
 
Avalanche Advisory March 25, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Tuesday, March 25th, 2014 at 6:34 am
Categories: Advisories
<o:p></o:p>

<o:p></o:p>
There is MODERATE avalanche danger in the West Central Montana backcountry above 5000 feet, on slopes 35 degrees and steeper. MODERATE means heightened avalanche conditions in specific terrain. Steep slopes at higher elevations (>5000 feet) may produce avalanches, particularly during the warmest parts of the day.<o:p></o:p>
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for March 25, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight (March 25).<o:p></o:p>
Our last scheduled avalanche advisory for the season will be this Friday, March 28.<o:p></o:p>
Weather and Snowpack <o:p></o:p>
This morning west and southwest mountain winds are blowing 12 to 20 mph and gusting into the upper 20’s. Mountain temperatures are ranging between 19 (F) in the southern Missions to 32 (F) at Saddle Mountain near Lost Trail Pass. Today may be the end of the nice weather for awhile.<o:p></o:p>
I hiked into the Rattlesnakes yesterday and observed a lot of point releases on steep slopes during the heat of the day. These types of slides usually aren’t a problem, unless you get caught in a big one and it carries you into rocks or trees. We got a public observation from the Bitterroot yesterday that mentioned ice crusts. I found this “double crust” in the Rattlesnakes yesterday (Rattlesnakes Pit Profile); and though my pit tests were showing good strength and moderate energy, I wasn’t comfortable with the layering. I would look for this weakness if considering steep terrain.<o:p></o:p>
The guides at Yurtski (southern Swans) found the “double crust” in their snowpits as well. They saw and triggered some small wet slides during the afternoon on southerly exposures.<o:p></o:p>
Tim and Travis took the sleds into the Spruce Creek area near Lolo Pass. They saw the same “double crust”, albeit with more snow sandwiched in between (Spruce Creek Pit Profile). They noted loose, cold snow sluffing on steep northerly slopes, evidence of cornice releases and point releases near rocks (most likely during warm periods). As Travis put it “specific terrain has problems; everything else looks low”.<o:p></o:p>
These crust formations in the snow (from the intermittent sun, then snow, then sun) are widespread. Folks are getting failures in pits throughout the advisory area. You wouldn’t have to dig too deep to look for an instability, and it may pay off.<o:p></o:p>
Cornices are large and will continue to be a concern through Spring. Warmer temperatures can make them more likely to fail. Cornices are unpredictable in the Spring; best to avoid them during the warm part of the day.<o:p></o:p>
Weather Forecast and Avalanche Outlook<o:p></o:p>
The sun was out in the morning yesterday and then a bit of cloud cover came over. This kept things from heating up too radically. The warm temperatures offset with some clouds should help the snow continue to settle.<o:p></o:p>
Scattered mountain snow showers are predicted to return tonight and persist into the weekend. Snow levels will begin around 5000 feet and lower to 4000 feet by Thursday. With new snow, I would expect the avalanche danger to remain MODERATE on steep slopes.<o:p></o:p>
Generally, the first rain-on-snow event in the Spring causes us the most concern. That being said, anytime it rains on steep slopes the immediate effect adds weight and loosens the snow. You should avoid steep slopes during and immediately after rain events.<o:p></o:p>
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 .<o:p></o:p>
Ski and ride safe; have a good week.<o:p></o:p>
I will issue our last regular advisory on Friday, March 28, 2014.<o:p></o:p>
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:p></o:p>

<o:p> </o:p>
--

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:p></o:p>



 
Avalanche Advisory March 28, 2014<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

This entry was posted on Friday, March 28th, 2014 at 6:44 am
Categories: Advisories
<o:p></o:p>

<o:p></o:p>
There is MODERATE avalanche danger in the West Central Montana backcountry above 5000 feet, on slopes steeper than 35 degrees. Avalanches involving new snow or fresh wind slabs are possible on steep (>35 degrees) slopes. Rain on the snow may produce avalanches on melt-freeze crusts in the snowpack. Warmer temperatures can make cornice failure more likely.<o:p></o:p>
In the last 24 hours the southern Missions, southern Swans and central Bitterroot picked up more snow than the general advisory area. Due to the increased load, the snow will be more sensitive in these locales.<o:p></o:p>
Good Morning, this is Dudley Improta with the West Central Montana avalanche advisory for March 28, 2014. This danger rating does not apply to operating ski areas and expires at midnight tonight (March 28). This is our last regularly scheduled advisory for the season.<o:p></o:p>
We will continue to post public observations that are sent in.<o:p></o:p>
Weather and Snowpack<o:p></o:p>
This morning westerly mountain winds are blowing around 13 mph and gusting into the 20′s . Mountain temperatures are in the low to upper 20 (F) degree range. The area picked up snow yesterday and it is snowing this morning. Generally there are 5 to 6 inches of new snow; but the North Fork Jocko Snotel is showing 8 inches and Twin Lakes Snotel is showing 11 inches. The snow in the southern Missions and Swans, as well as the central Bitterroots will be more sensitinve due to the increased load.<o:p></o:p>
Travis and I were in the Rattlesnakes yesterday; Tim and Dave checked out the snow near Lolo Pass. We had the same avalanche concerns:<o:p></o:p>
1. New, loose snow was sluffing easily on steep slopes. The new snow from Wednesday night and Friday did not bond well to the old surface layer. There is about a half a foot of snow that will slide. Get enough of it going on a big, steep slope and it could be an issue. The wind will have increased the amount of snow on leeward slopes; creating wind slabs above 7000 feet.<o:p></o:p>
2. The multiple crusts I talked about Tuesday are still present in the snowpack (Rattlesnake profile) (Lolo Pass profile). They are not producing energetic failures in tests; but they could produce avalanches by allowing horizontal movement of water in the snowpack if (when) it rains.<o:p></o:p>
3. Cornices are large this year. Avoid them during warm weather.<o:p></o:p>
David Fox and Geoff Fast were out near Lost Trail Pass. Their main concern was also the new snow, but near 8000 feet wind slab formation was number one on the list, with loose snow avalanches a secondary worry. They also noted the chance of deeper layers failing (Lost Trail profile) and cornice failure.<o:p></o:p>
Weather Forecast and Avalanche Outlook<o:p></o:p>
Tonight and Saturday a wet Pacific system is expected to move into the Bitterroot Mountains. The storm could produce up to an inch of water equivalent in the Bitterroots. Other mountains in West Central Montana should expect at least a half an inch of water equivalent.<o:p></o:p>
Heavy, wet snow will increase the avalanche danger.<o:p></o:p>
I hate to leave with the previous sentence on our last regular advisory – so I won’t. Many of you will be in the mountains this spring, as you should; we have a ton of snow out there. Generally, the snow tends to stabilize as spring progresses. But, late-season avalanches are not that rare; so keep the radar up. Heavy snowfalls, rain, the heat of the day and cornices are some of the things that should get your attention when riding or skiing the steeps this spring.<o:p></o:p>
missoulaavalanche.org (West Central MT Avalanche Foundation)<o:p></o:p>
The relationship between the West Central Montana Avalanche Center and missoulaavalanche.org can sometimes be confusing. Missoulaavlanche.org is a 501(3)(c) that supports the Center through a cost-share agreement with Lolo National Forest.<o:p></o:p>
Although the Forest Service is responsible for the avalanche advisories; missoulaavlanche.org provides all operating funds, including salaries for the forecasters (avalanche specialists) and educators. Funds are raised primarily through the efforts of the folks on the missoulaavalanche.org Board of Directors. They are Mark Waller (Chair), Steve Porcella, Spencer Bradford, Ross Peterson, Russ Read, Mike Birnbaum, Justin Metcalf, Zachary Millar, Mark Fricke and Katy-Robin Garton.<o:p></o:p>
Without their hard work it would be difficult, if not impossible, for the Center or the advisories to exist. The community is fortunate to have these folks volunteering their time.<o:p></o:p>
If you would like to send us snow observations; you can use our public observations form or e-mail us at info@missoulaavalanche.org .<o:p></o:p>
This is our last scheduled advisory for the 2013/2014 season.<o:p></o:p>
Ski and ride safe; enjoy the spring snow.<o:p></o:p>
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:p></o:p>

<o:p> </o:p>
--

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:p></o:p>


 
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