2016-17 W. Central Montana Avy conditions thread---"NO RATING"

Scott · Jan 19, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_258543308091508219templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_258543308091508219bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 17, 2017

View Full Advisory »

The current avalanche danger is LOW for the west central Montana backcountry. Human triggered avalanches are still possible in isolated terrain.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for January 17, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 13 F to 26 F in the region. Winds are 10 mph out of the S in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 22 mph with gusts of 32 mph out of the WSW. The forecast area received 0 to 1 inches of new snow in the last 24 hours. The new snow had SWE’s ranging from 0 to .2 inches of water.
Steve and I took the sleds into the Crooked Fork around Lolo Pass yesterday. Logan went to Crystal Theater. Dudley was at Yurtski in the southern Swan over the weekend teaching a level 1. The persistent weak layers in our snowpack are gaining strength. The high and dry weather has made for some good touring, but all observers reported large surface hoar growth on all aspects. This will be our next layer of concern.
The first avalanche problem is wind slabs. Remember identify wind slabs and avoid them. These slabs are on many different aspects, and some slopes are cross-loaded due to the changes in wind direction over the last couple of days. We had two great public observations from the weekend with wind slabs. Click on the links to see them. One of the slabs was human triggered, and the other was natural.
The second avalanche problem is persistent slabs. There are two layers (1.) 2 feet from the surface of near surface facets and (2.) the basal facets on the ground. The layers are gaining strength. Dig a pit to assess these facets before committing to any steep slope.
These avalanche problems are in isolated terrain. Low avalanche danger still means human triggered avalanches are still possible. Assess slopes carefully and identify any concerns.
Avalanche and Weather
The precipitation forecast maintains a slowing trend, so light snow is possible by this afternoon, but the majority is not expected to begin until Wednesday morning. The avalanche danger will increase with the precipitation. The main concern will be the surface hoar that is being buried by the new snow.
We have been getting a lot of public observations, thank you. If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory.
The West Central Montana Avalanche Center would like to extend our deepest condolences to friends and families of all involved in the avalanche fatality in Southern Glacier National Park on Thursday, January 05, 2017. Here is the link from the Flathead Avalanche Center of the full report. Logan will issue the next advisory on Thursday, January 19, 2017.
Ski and ride safe.

The post Avalanche Advisory for January 17, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 19, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-554478550912785463templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-554478550912785463bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 19, 2017

View Full Advisory »

The current avalanche danger is LOW for the west central Montana backcountry. Human triggered avalanches are still possible in isolated terrain. If we get more snow then predicted expect the avalanche danger to increase.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for January 19, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 24 F to 35 F in the region. Winds are 13 mph out of the SE in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 16 mph with gusts of 24 mph out of the WSW. The forecast area received 0 to 1 inches of new snow in the last 24 hours. The new snow had SWE’s ranging from 0 to .2 inches of water.
Tim and I took the sleds to the central Bitterroot yesterday, near Elk Meadows. Logan was in the Rattlesnake. We observed active snow transport(video). The warm temperatures have helped to decrease the instabilities in the snowpack. We all saw small loose wet releases.
The primary concern is small wind slabs. These formed on leeward terrain and should be relatively shallow due to the limited amount of snow available for transport.
The second avalanche problem is persistent slabs. There are two layers (1.) 2 feet from the surface of near surface facets and (2.) the basal facets on the ground. We have not had propagation on the two layers of concern for the past week. Dig a pit and see if these layers are reactive. If the mountains receive more heavy wet snow than predicted, expect these layers to become more sensitive to triggers.
The last avalanche concern is loose wet releases. We all observed roller balls on slopes later in the day. These show us the snow surface is getting warm. If you see rollerballs or small point releases on the slope, move to a more shaded aspect, and avoid terrain traps.
Avalanche and Weather Outlook.
Snow accumulations are predicted to be low, less than an inch. Warm temperatures will continue through tonight, and then a cold air mass will move in. The avalanche danger will remain the same with these conditions. If we get a large new load of snow on the layers, expect the avalanche danger to increase.
We have been getting a lot of public observations, thank you. If you are out in the backcountry, please send us what you saw, these are very helpful in producing the advisory.
Logan will issue the next advisory on Saturday, January 21, 2017.
Ski and ride safe.

The post Avalanche Advisory for January 19, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 23, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_5789107347554526397templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_5789107347554526397bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 21, 2017

View Full Advisory »

The current avalanche danger is LOW for the West Central Montana backcountry. Low danger does not mean no danger. Human triggered avalanches are still possible, unstable snow can be found on isolated terrain features.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Saturday, January 21, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Conditions this morning continue to be mild with mountain temperatures in the teens to low twenties across the region. Winds are light this morning as Point 6 is recording winds gusting to 18mph out of the east and at Deer Mountain in the southern Bitterroot winds are gusting to 17mph from the south-east. Most snotel sites show no new snow overnight while Twin Lakes in the Bitterroot possibly picked up an inch or two of snow since yesterday afternoon.
Observers near Lost Trail Pass were able to get small windslabs to fail on Thursday and the windslabs will continue to be the primary concern today. Windslabs are small and isolated and may be hard to identify so carefully look for sign of wind transport when choosing where to recreate today. Winds have been anything but consistent this year and unfortunately windslabs can still be found on any aspect due to local variability in the wind, so carefully evaluate which aspects and terrain features are wind loaded while you are traveling.
The secondary avalanche concern today will be persistent slabs. Travis and Matt were in the southern Missions yesterday and found the near surface facets to be reactive in compression tests but they did not propagate in extended column tests. The persistent weak layers will be of greatest concern in areas where the surface snow has settled and formed a slab. Slabs are not widespread but pay attention to how the snow feels underneath you as you travel and if it has a slab like feel to it, take the time to look at what snow structure is underneath.
Finally Temperatures have been warm and what little snow we have seen the last couple days has been wet and heavy. Small wet point releases have been seen throughout the region over the last few days. Be cautious of heavily solar affected aspects that will be more prone to these small wet slides, if you see rollerballs start moving try to find a cooler and dryer aspect to recreate on. Although not large in size these loose wet slides can be dangerous if terrain traps are present. Keep in mind the consequences of even a small slide if there are trees or rocks that you would get carried through or over.

Avalanche and Weather Outlook.
A weak disturbance is expected across the region today bringing scattered light snow showers, with minimal accumulations. The subtle change in the weather will not have an effect on the avalanche conditions and the avalanche danger looks to stay the same through today.
We continue to get great public observations, and as always if you get out please feel free to share what you are finding. Your observations are extremely helpful with writing the advisory and keeping track of regional conditions.
The next regularly scheduled advisory will be on Tuesday, January 24, 2017.
Ski and ride safe.
The post Avalanche Advisory for January 21, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 25, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-4492932626187708195templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-4492932626187708195bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 24, 2017

View Full Advisory »

The current avalanche danger is LOW for the west central Montana backcountry. Human triggered avalanches are still possible in isolated terrain.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for January 24, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 11 F to 18 F in the region. Winds are 8 mph with gust of 13 mph out of the NNE in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 9 mph with gusts of 13 mph out of the E. The forecast area received 0 to 2 inches of new snow in the last 24 hours. The new snow had SWE’s ranging from 0 to .2 inches of water.
Tim and I took sleds to Granite Pass in the northern Bitterroot, yesterday. Matt and Josh were in the Rattlesnake over the weekend, teaching a level 1 class. All of us observed fresh shallow wind slabs. We saw no propagation in ECT’s.
Today’s primary avalanche problem is small, shallow wind slabs. These slabs are 1 to 2 inches in depth. They are isolated on leeward terrain. Wind slabs can be identified by smooth rounded pillows on the surface near ridgelines.
The second avalanche problem is persistent slabs. There are two layers (1.) 2 feet from the surface of near surface facets and (2.) the basal facets on the ground. These instabilities are healing, and we have not seen propagation in tests for almost two weeks. Still, dig a pit before committing to any steep slopes.
Avalanche and Weather Outlook
A subtle disturbance is moving through the region today through Wednesday; this will bring a couple of inches of snow to the area. With these conditions, the avalanche danger will stay the same.
Join us tonight at the University of Montana in the North Urey Lecture Hall at 6:00 pm for a free lecture on Introduction to Avalanches.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next advisory on January 26, 2017.
Ski and ride safe.

The post Avalanche Advisory for January 24, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 26, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_8111689561993706727templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_8111689561993706727bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 26, 2017

View Full Advisory »

The current avalanche danger is LOW for the west central Montana backcountry. Human triggered avalanches are still possible in isolated terrain.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for January 26, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 12 F to 21 F in the region. Winds are 5 mph with gusts of 7 mph out of the WSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 7 mph with gusts of 10 mph out of the WNW. Some snotels are not reporting this morning. The North Fork of the Jocko received 8 inches of snow in the last 24 hours with a SWE of .5 inches of water. The other sites that are reporting received 2-3 new inches of snow with .1 inches of water.
Logan and I did an extended tour in the Rattlesnake, yesterday. Tim and Greg took the sleds to Spruce Creek in the central Bitterroot. We dug several pits on multiple aspects and elevations. The instabilities in our snowpack are healing. We were not able to get any propagation in any of our pit tests. The new snow is very low density and has come in with the very little wind.
The primary avalanche concern is loose dry avalanches. These sluffs are small and very low energy. They will only be a concern if they carry you into a terrain trap.
The second avalanche problem is wind slabs. These are small and shallow located in isolated pockets on leeward terrain. You can identify these slabs by smooth rounded pillows on the surface near ridgelines.
The final avalanche concern is persistent slabs. There are three layers to examine in pits before committing to a slope. The interface of the new snow and old snow surface. The rain crust 40 cm to 50 cm from the surface. Finally, the basal facets near the ground. These layers have not propagated in any of our observers’ tests for nearly two weeks. We did get a public observation of propagation on the rain crust in an ECT on Mt. Fuji near, Lolo Pass. If you get propagation in your pit, choose to back off the slope and ride lower angle terrain.
Avalanche and Weather Outlook
Light snow this morning then clearing skies. High pressure will build, but there is a chance for some light accumulation of snow on Friday. With these conditions, the avalanche danger will remain the same.
Join us tonight at the University of Montana in the North Urey Lecture Hall at 6:00 pm for a free lecture on Introduction to Avalanches part 2.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. Logan will issue the next advisory on January 28, 2017.
Ski and ride safe.

The post Avalanche Advisory for January 26, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 31, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-586369142752084284templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-586369142752084284bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 28, 2017

View Full Advisory »

The current avalanche danger is MODERATE on wind loaded terrain for the northern portion of the advisory area. Small to large human triggered avalanches are possible in areas where windloading has occurred. On all other terrain and for the rest of the advisory area the avalanche danger is LOW.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Saturday January 28, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
This morning mountain temperatures range from 11-20 degrees. Currently winds at Point 6 are 17mph and gusting to 21mph from the west. Winds are gusting to 12mph from the SSW at Deer Mountain in the southern Bitterroot. No snow accumulated overnight across the advisory area.
Travis and Matt were in the Rattlesnake yesterday and found the primary concern to be windslabs that have developed over the last couple of days. With the new low density snow for transport and good winds, soft windslabs have formed on lee terrain and will be sensitive to human triggers. We also received a public observation of a small windslab that was kicked of in the Rattlesnake yesterday. Windslab growth has been more concentrated in the northern part of the advisory area and will be a more widespread problem in the Rattlesnake and Southern Swan and Southern Mission ranges.
I toured around Mt. Fuji yesterday and found widespread surface hoar growth and two layers of buried surface hoar. The buried surface hoar had light snow sitting on top of it but will be suspect if the snow overlying it has more cohesive qualities (video). Travis also found persistent weak layers to be a concern with the basal facets being reactive and propagate yesterday in areas where the snowpack is shallow (video). Be wary of the persistent weak layers near likely trigger points, such as shallow or rocky areas and cooler aspect where the facet growth is more prominent.
Observers near Lost Trail yesterday found the light snow on the surface continued to create small loose snow avalanches and sluffs. Keep in mind the consequences of these small loose snow slides in areas with terrain traps.

Avalanche and Weather Outlook
The weather today will be similar to yesterday with the possibility of intermittent snow flurries with minimal accumulations. The avalanche danger will remain the same throughout the day today.
If you are out in the backcountry, please feel free to share your observations on our public observations page, they are a great resource and are very helpful in producing the advisory. I will issue the next advisory on Tuesday January 31, 2017.
Ski and ride safe.
The post Avalanche Advisory for January 28, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 31, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_7629159765051739462templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_7629159765051739462bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for January 31, 2017

View Full Advisory »

The current avalanche danger is MODERATE on wind loaded terrain for the West Central Montana Backcountry. Human triggered avalanches will be possible in specific areas and careful assessment will be required to identify areas of concern. On other terrain in the advisory area the avalanche danger is LOW. Conditions will be dynamic today and as more snow falls, continual evaluation of the snowpack will be essential to recreate safely.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday, January 31, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Snowfall and more mild temperatures have returned to the region overnight. So far across the advisory area 1-3 inches of snow have accumulated with more expected for the next 24 hours. The new snow has only added .1-.2 inches of snow water so far. The strong westerly winds have eased slightly this morning and are currently 11 gusting to 17 mph out of the NW at Point 6, and 7 gusting to 11 mph from the SSW at Deer Mountain.
The primary avalanche concern today will be windslabs. We had a number of public observations over the last couple of days from in and around the advisory area pointing to windslab concerns. Windslabs have had some time to settle the last few days but now that there is more snow for transport windslab growth will ramp back up and time will be needed for the snow to adjust to the developing windslabs.
Persistent slabs will be the secondary avalanche concerns today. There has been widespread surface hoar growth over the last week and a half. With snow falling on surface hoar and near surface facets not far below in the snowpack, persistent slabs will be sensitive to triggers today. With such widespread surface hoar growth take the time today to dig and look at the snow to see what is underneath before deciding where to recreate. Facets deeper in the snowpack will also have potential to be reactive in shallow areas as they are stressed by a new load. Carefully evaluate terrain for features that will make the persistent weak layers a greater concern, such as shallow or rocky areas.
Loose snow will be the final concern today. Small sluffs or loose snow avalanches are mainly concerns for areas that have terrain traps that increase the consequences of getting caught. As more snow accumulates so will the size of the loose snow avalanches.

Avalanche and Weather Outlook
The weather pattern has finally shifted and snow is expected to continue through tonight. The models suggest up to a foot of mountain snow by tomorrow morning. With significant snow in the forecast avalanche conditions look to increase today. As the snow totals increase so will the possibility of avalanches. Continually monitor conditions as they change throughout the day today.
If you are out in the backcountry, please feel free to share your observations on our public observations page, they are a great resource and are very helpful in producing the advisory. I will issue the next advisory on Thursday, February , 2017.
Ski and ride safe.
The post Avalanche Advisory for January 31, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Jan 31, 2017

I saw natural sloughing this past weekend, so don't kid yourself that things won't go on their own right now.

Scott · Feb 2, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_109505515857452656templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_109505515857452656bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 2, 2017

View Full Advisory »

The current avalanche danger is MODERATE on wind loaded terrain for the West Central Montana Backcountry. Human triggered avalanches are possible on specific terrain, careful evaluation of avalanche conditions are necessary to recreate today.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Thursday, February 2, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Since Tuesday morning an additional 7-14 inches of snow has accumulated in the advisory area. The new snow has added .6-.9 inches of SWE. Winds this morning are out of the East at Point 6 and range from 27-36 mph. At Deer Mountain in the southern Bitterroot winds are calm this morning.
Yesterday Tim and I rode into Twin Lakes and found nearly a foot of new low density snow. Travis found similar conditions while touring in the Rattlesnake. The new low density snow is easily transported and Travis found debris from a naturally released windslab from Tuesday night (pic). Tim and I found active transporting and were able to get some small results in wind loaded terrain with ski cutting. On our ride out we saw a few windslabs that released naturally during the day yesterday (pic1) (pic2). With the activity observed yesterday paired with the wind loading we observed the primary avalanche concern will be windslabs. Identify terrain that appears to be wind loaded and carefully evaluate consequences of an avalanche.
With a large amount of loose dry surface snow, sluffs and loose dry avalanches will be likely in steep terrain. Carefully evaluate the consequences of a loose snow slide as there is a significant amount of snow that can be entrained.
Finally persistent slabs were not reactive yesterday but will still be a bit suspect and will need some time to adjust to the new load. Take the time to dig and see what is under the new surface snow and be cautious of any persistent weak layer that has a slab above it.

Avalanche and Weather Outlook
As a little more moisture moves in, it will bring some light accumulating snow to most areas today. With minimal accumulations expected, avalanche conditions will remain the same today. The next round of significant snow looks to start Friday and continue through Monday.
If you are out in the backcountry, please feel free to share your observations on our public observations page, they are a great resource and are very helpful in producing the advisory. Travis will issue the next advisory on Saturday, February 4 , 2017.
Ski and ride safe.
The post Avalanche Advisory for February 2, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 6, 2017

THE CONDITIONS CHANGED VERY QUICKLY!!!

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-2238751841155595884templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-2238751841155595884bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 4, 2017

View Full Advisory »

The current avalanche danger is HIGH on wind loaded slopes for the west central Montana backcountry. The danger is CONSIDERABLE on all other slopes in the advisory area. Avoid all wind loaded terrain. Careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential today. Human triggered avalanches are likely.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for February 04, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 23 F to 33 F in the region. Winds are 9 mph with gusts of 24 mph out of the WSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 20 mph with gusts of 37 mph out of the W. The region has picked up several new inches of heavy wet snow in the last 24 hours. The new snow had SWE’s ranging from .3 to 1.4 inches of water.
Logan and I toured in the Rattlesnake yesterday. We chose to go to the Rattlesnake because the snowpack structure is the weakest in the advisory area. We were able to get the basal facets to propagate in ECT’s. Ed was in the southern Bitterroot; his two main concerns were wind slabs and layers of buried surface hoar. John Lehrman from Downing Mountain Lodge in the central Bitterroot sent observations of new loading and wind slab development between 6000 ft and 7000 ft.
The primary avalanche problem is wind slabs. The winds are transporting the new snow and loading leeward slopes(video). We observed some slopes that were cross-loaded yesterday in the Rattlesnake. Ed found ridges to have significant wind slabs on them. Identify wind loaded terrain and avoid traveling on these slopes today.
The second avalanche concern is persistent slabs. There are multiple weak layers in our snowpacks. The basal facets propagated yesterday in the Rattlesnake. With the new load of snow, Ed identified layers of buried surface hoar which could become reactive today. Dig a pit today to assess any weak layers before committing to avalanche terrain. Pay attention to any bullseye data (shooting cracks, collapse noises, and any recent avalanche activity). These are clear signs of instability in our snowpack.
The final avalanche problem today is storm slabs. The new heavy wet snow will take time to bond to the snow surfaces.
Avalanche and Weather Outlook
Snow levels should rise today with a maximum height of 4500 ft. Today there will be the additional loading of snow and high winds. The avalanche danger will increase with these conditions. Pay close attention to changing weather and snow conditions. Reassess travel plans regularly today. Avoid all wind loaded terrain. Dangerous avalanche conditions exist. Careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential today.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next advisory on February 07, 2017.
Ski and ride safe.

The post Avalanche Advisory for February 4, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 7, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-1554267165537682571templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-1554267165537682571bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 7, 2017

View Full Advisory »

The current avalanche danger is HIGH in the west central Montana backcountry. Travel in avalanche terrain is not recommended today. Human triggered avalanches are very likely and natural avalanches are likely. Avoid runout zones.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for February 07, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 8 F to 22 F in the region. Winds are 6 mph with gusts of 10 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 10 mph with gusts of 18 mph out of the W. The region has picked up 5 to 7 new inches of snow in the last 24 hours. The new snow had SWE’s ranging from .3 to .6 inches of water. Temperatures have cooled overnight.
Logan and I took the sleds to the southern Missions yesterday. Tim and Greg went to Lolo Pass yesterday. Josh and Matt were in the Rattlesnake over the weekend teaching a level 1 avalanche course. We all observed new loading and high winds. The new snow needs time to bond with the old snow surfaces. We got propagation on persistent weak layers in the Rattlesnake and Lolo Pass(video). The snow was very dense and felt slabby.
The primary avalanche problem is wind slabs. There is a lot of new low-density snow that fell overnight that loaded leeward aspects. Identify wind loaded terrain and avoid it. Stay away from lower angle terrain connected to steeper terrain and avoid runout zones.
The second avalanche concern is persistent slabs. There are multiple weak layers in our snowpack that the new loading of snow has made reactive. There is the possibility of triggering a layer and having it step down to the lower weak layers. Avoid runout zones. Stick to lower angle terrain.
The final avalanche problem is storm slabs. There is significant new snow in the area, and the snowpack needs time to adjust to the new load of snow. Stick to lower angle terrain and give this snow time to settle.
Avalanche and Weather Outlook
In our advisory area temperatures dropped throughout the day and night and it is currently snowing. Our region is predicted to accumulate more light snow through Wednesday. A warmer air mass is predicted to move in Wednesday night raising temperatures. The additional snow will keep our avalanche danger the same.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next advisory on February 09, 2017.
Ski and ride safe.

The post Avalanche Advisory for February 7, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 9, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="border-collapse: collapse;"><table width="600" id="m_-3273686847271374558templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-3273686847271374558bodyContent" valign="top" style="border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="border-collapse: collapse;">

Avalanche Warning for February 9, 2017

View Full Advisory »

An avalanche warning is in effect for the west central Montana backcountry. The current avalanche danger is HIGH. Very dangerous avalanche conditions are present. Travel in avalanche terrain is not recommended today. Human triggered avalanches are very likely, and natural avalanches are likely. Avoid runout zones.
Good morning, this is Travis Craft with an avalanche warning for February 09, 2017. This avalanche warning will expire at 0600 am on February 10, 2017. The warning will be extended or terminated at that time.
This danger rating does not apply to operating ski areas and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 27 F to 37 F in the region. Winds are calm in the Bitterroot. Point Six, in the northern part of the advisory area, winds are calm. The region has picked up 5 to 7 new inches of snow in the last 24 hours. The new snow had SWE’s ranging from .8 to 1.8 inches of water. Temperatures are warming increasing the height of rain snow mix. Rain on snow is a recipe for avalanches. This new rapid load of weight has increased the avalanche danger.
Logan and I went Lolo Pass yesterday. Tim and Greg went to the Rattlesnake. We got propagation in our snow pit tests. We all found a significant amount of new snow on buried weak layers. The addition of the overnight snow and rain to our snowpack will increase the sensitivity of the weak layers. Avoid traveling in all avalanche terrain today. Avoid runout zones.
The primary avalanche problem today is persistent slabs. There is a layer of near surface facets and surface hoar 65cm from the surface below a melt freeze crust that is propagating in Lolo(video). There is a layer of surface hoar in the Rattlesnake that is propagating(video). These layers will become more sensitive to triggers by the addition of the new load of snow and rain to 6500 feet.
The second avalanche problem is storm slabs. There is a significant amount of new heavy snow. Rain has fallen to 6500 feet. The snowpack needs time to adjust to the new load of snow and rain. Avoid all avalanche terrain today.
Wind slabs are the last avalanche concern today. Wind slabs will be sensitive today to triggers with the additional loading of snow. Avoid runout zones.
Avalanche and Weather Outlook
Snow levels are climbing. The snow line is predicted to be 6500 feet today. The forecast is for significant amounts of precipitation; this will increase the avalanche danger.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. Logan will issue the next advisory on February 11, 2017.
Ski and ride safe.

high

The post Avalanche Warning for February 9, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 10, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="border-collapse: collapse;"><table width="600" id="m_7289000156487167616templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_7289000156487167616bodyContent" valign="top" style="border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="border-collapse: collapse;">

Avalanche Warning for February 10, 2017

View Full Advisory »

An Avalanche Warning is in effect for the west central Montana backcountry. The current avalanche danger is HIGH. Very dangerous avalanche conditions are present. Travel in avalanche terrain is not recommended today. Human triggered avalanches are very likely, and natural avalanches are likely. Avoid runout zones.
Good morning, this is Travis Craft with an avalanche warning for February 10, 2017. This avalanche warning will expire at 0600 am on February 11, 2017. The warning will be extended or terminated at that time.
This danger rating does not apply to operating ski areas and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 30 F to 37 F in the region. Winds are 12 mph with gusts of 18 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are calm. The region has picked up several new inches of heavy wet snow and rain to 6500 ft in the last 24 hours. The new snow had SWE’s ranging from .3 to 2.1 inches of water.
Yesterday Snowbowl ski patrol got impressive results with explosives, slabs failed 8 to 12 inches deep then stepped down into deeper layers in the snowpack. All routes observed shooting cracks and collapse noises. Rain fell to 6500 feet yesterday.
The main avalanche problem today is persistent slabs. The new load of snow and rain are stressing our weak layers in the snowpack. Travel in avalanche terrain is not recommended.
The second avalanche concern is storm slabs. We are still accumulating snow. The new snow is heavy and wet and is on top of lighter dryer snow. The snowpack needs time to adjust to the new load. Avoid runout zones.
The final avalanche problem will be wind slabs above 6500 ft. These slabs were stubborn to ski cuts yesterday on control routes but released easily with explosives. The addition of new snow on these slabs will make them more sensitive to triggers. Travel in avalanche terrain is not recommended.
Below 6500 feet the primary concern will be wet slabs. Rain and temperatures above freezing have made unstable conditions in lower elevation snowpacks. Roller balls are sure signs of instability. Avoid traveling in runout zones.
Avalanche and Weather Outlook
Colder air moves into the area today and tonight which will drop the snow line. The forecast is for continued precipitation. With the predicted weather expect the avalanche danger to stay the same.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. Logan will issue the next advisory on February 11, 2017.
Ski and ride safe.

high

The post Avalanche Warning for February 10, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 13, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_2806229393394136606templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_2806229393394136606bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 11, 2017

View Full Advisory »

The avalanche warning has expired and the current avalanche danger is CONSIDERABLE for the West Central Montana Backcountry. Human triggered avalanches are likely in specific areas, careful evaluation of avalanche conditions are necessary to recreate in the backcountry today.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Saturday, February 11, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Precipitation has returned to dry snow and snow totals this morning range from a trace to 3 inches with SWE’s topping out at .2 inches of water. Since Wednesday the advisory area has seen 1.8-3.5 inches of SWE. At Deer Mountain the winds are currently 6mph gusting to 16mph from the WSW. Mountain temperatures this morning range from 19-25 degrees.
At elevations above freezing level, the main avalanche concerns will be wind slabs, storm slabs and persistent weak layers. Josh and Tim reported wind slabs as a major concern in the Rattlesnake yesterday and we found a surprising amount of wind affected snow near Granite Pass. Winds were under reported/recorded during the storm making windslabs harder to characterize, so look carefully for signs of wind loading before recreating.
Tim and Josh found a density change in the storm snow to be reactive and propagate in stability test. We also found a number of density changes within the new snow to be suspect near Granite Pass. This problem will require some time for the layers to bond and settle down. Persistent weak layers were broken down a bit by the rain on snow event and are less prominent but propagation saw tests showed the persistent weak layers to be reactive under the heavy new load in the Rattlesnake. Take the time to dig to find these density changes and persistent weak layers when assessing the snowpack before committing to avalanche terrain.
Yesterday Travis and I rode around near Granite Pass and found a very wet heavy load of new snow with clear signs of significant rain falling on the snowpack. Wet slab avalanches will be possible in any terrain where the snow did not freeze overnight. Be very careful at lower elevations as wet slabs are very difficult to predict and tend be large and very destructive. A human triggered wet slab was reported yesterday from just outside our advisory area.
Conditions will be touchy for the next day or two, careful snowpack evaluation, cautious route finding, and conservative decision making will be essential over the weekend as the weaknesses continue to settle out.

Avalanche and Weather Outlook
Light snow is expected off and on today with minimal accumulations before giving way to a high pressure system to start off next week. Avalanche danger will be decreasing as the snow has more time to adjust and settle. The next system looks to move in towards the end of next week and will be warm but doesn’t look to be as warm and wet as the last storm cycle.
If you are out in the backcountry, please feel free to share your observations on our public observations page, they are a great resource and are very helpful in producing the advisory. Travis will issue the next regular advisory on Tuesday, February 14 , 2017.
Ski and ride safe.
The post Avalanche Advisory for February 11, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 14, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-4497831443858616295templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-4497831443858616295bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 14, 2017

View Full Advisory »

The current avalanche danger is CONSIDERABLE on steep( >30 degrees) wind loaded slopes above 7000 ft for the west central Montana backcountry. All other slopes above 7000 ft are MODERATE. Below 7000 ft all slopes areLOW in the morning and will rise to MODERATE in the afternoon.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for February 14, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 17 F to 32 F in the region. Winds are 3 mph with gusts of 4 mph out of the S in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 11 mph with gusts of 16 mph out of the NNW. No new snow in the last 24 hours. Some remote stations are reporting and others are offline.
The past storm caused a natural avalanche cycle through the west central Montana backcountry. There were many reports of natural crowns from the southern Bitterroot to the southern Swan that happened Wednesday through Friday. Tim and I were in the central Bitterroot yesterday. Josh, Matt, and Ryan were at Lost Trail Pass teaching a level-one avalanche course over the weekend. Dudley was at Yurtski in the southern Swan also teaching. Josh and Ryan had a day off yesterday and went to the Missions just north of our advisory area. We all saw evidence of the natural avalanche cycle. We saw wind scoured and loaded slopes at elevations above 7000 ft. We all experienced the inversion yesterday and noted roller balls were releasing naturally in the afternoon on sun exposed slopes. Dudley got propagation in multiple snow pits on different aspects in the southern Swan above 7000 ft. Josh and Matt got propagation in pits at Lost Trail above 7000 ft. Tim and I did not get propagation in our pit at 7000 ft in the central Bitterroot. Ryan and Josh saw wind loaded slopes and natural debris in the Missions just North of our advisory area, above 7000 ft.(Here is the Link to Trip Report).
The primary avalanche problem is wind slabs above 7000 ft. These slabs are on leeward terrain. They will be sensitive to human triggers.
The second avalanche concern is persistent slabs. There are many weak layers in our snow pack. Before committing to any steep terrain assess the layers in the snowpack by digging a pit. These weak layers are at all elevations.
The last avalanche problem is loose wet releases in the afternoon on sun exposed slopes. The temperature will rise throughout the day, pay attention to roller balls. When the roller balls appear it is time to change aspects to a shadier one.
Avalanche and Weather Outlook
The region will be dominated by high pressure the next two days. There will be a strong inversion. Make sure that the snow pack has refrozen by checking the remote weather stations to get a gauge of mountain temperatures. If mountain temperatures do not get below freezing overnight, be cautious when traveling on these slopes. With the predicted conditions, the avalanche danger will rise in the afternoon on sun exposed slopes.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. Logan will issue the next advisory on February 16, 2017.
Ski and ride safe.
The post Avalanche Advisory for February 14, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 16, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-2884992500935899968templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-2884992500935899968bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 16, 2017

View Full Advisory »

The current avalanche danger is MODERATE for the west central Montana backcountry. Human triggered avalanches are possible in specific terrain. Conditions will change quickly today as water is added to the snowpack and could easily jump to CONSIDERABLE by early afternoon. Continual evaluation of the avalanche conditions will be essential for recreating in the backcountry today.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Thursday, February 16, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
The high pressure system that has dominated the region early this week is deteriorating and overnight precipitation has started. So far this morning .1-.5 inches of SWE have been added to the snowpack and looks to be rain and not snow to at least 7,500ft. Mountain temperatures this morning are well above freezing in the upper 30’s to low 40’s. Ridge top winds are from the SW at 18mph gusting to 33mph at Point 6 and 16mph gusting to 31mph from the SSE at Deer Mountain.
Yesterday Tim and I toured in the Rattlesnake and we found the near surface facets continue to fail and propagate in extended column tests and propagation saw tests. The near surface facets are healing but are still reactive under the right conditions in isolated areas. Take the time to dig and see if the near surface facets are present and reactive before committing to a slope. Carefully evaluate not just the likelihood but also the consequences of getting caught in a persistent slab avalanche as there is a sizable amount of snow in the slab on top of the near surface facets.
The secondary concerns this morning will be wind slabs and loose wet slides. Wind slabs have had some time to settle but are still a concern at higher elevations and in steeper terrain. Look for signs of wind loading and stay aware of conditions as they change today. Loose wet avalanches will also be a concern today, although they are small stay aware of terrain traps that will increase the consequences of getting caught up in a small loose wet slide.
With rain overnight and more expected today the potential for wet slab avalanches will develop by mid-day today. Models suggest that nearly an inch of rain is expected for the Bitterroot Range. Rain on snow events rapidly change avalanche conditions and wet slabs are very difficult to predict, so if you are seeing significant rain on snow conservative decision making will be critical in the mountains today.

Avalanche and Weather Outlook
As the high pressure system is replaced by tropical moisture, precipitation will continue to develop across the region. Rain is expected to persist through the day today and will shift to snow tonight as the temperature starts to drop. Rain on snow can rapidly increase avalanche danger so keep an eye on how much and what type of precipitation is falling.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next regular advisory on February 18, 2017.
Ski and ride safe.
The post Avalanche Advisory for February 16, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-2884992500935899968templateFooter" style="border-top-color: currentColor; border-top-width: 0px; border-top-style: none; background-color: rgb(255, 255, 255);" border="0" cellspacing="0" cellpadding="10"><tbody><tr><td class="m_-2884992500935899968footerContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="100%" border="0" cellspacing="0" cellpadding="10"><tbody><tr><td id="m_-2884992500935899968social" valign="middle" style="margin: 0px; border: 0px currentColor; border-image: none; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(250, 250, 250);" colspan="2">

Twitter | Facebook | forward to a friend

</td></tr><tr><td width="350" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

West Central Montana Avalanche Foundation

PO Box 62

Missoula, MT 59806

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 21, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_2237942163753282681templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_2237942163753282681bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 18, 2017

View Full Advisory »

The current avalanche danger for the West Central Montana backcountry is MODERATEabove 7,000ft. Avalanches are possible in specific terrain at upper elevations. Below 7,000ft the avalanche danger is LOW and human triggered avalanches will be isolated.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Saturday, February 18, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Overnight temperatures dropped below freezing and mountain temperatures currently range from 28-31 degrees. Overnight snow was minimal and only a few snotels this morning are showing accumulations of about 1 inch of new snow. Currently ridge top winds at Point 6 are out of the ESE and are sustained at 11mph gusting to 18mph. Conditions are similar in the southern Bitterroot, the wind at Deer Mountain is sustained at 12mph gusting to 19mph from the SE.
The primary avalanche concerns today will be persistent slabs and wind slabs above 7,000 feet. Near surface facets and buried surface hoar continue to be reactive in stability tests at upper elevations and in areas with a shallow snowpack. Persistent weak layers are reactive but isolated and therefore are hard to detect unless you dig in the snow. Take the time to dig and see if persistent weak layers are present and reactive while determining where to recreate. Sustained moderate winds have been reported for the last 48 hours and observers in the Southern Bitterroot reported wind slabs as a notable concern and we found significant signs of wind transport while ridding to Granite Pass yesterday.
Wet loose snow avalanches will be a concern today as there is a fair amount of moisture in a relatively warm snow pack. It will not take long this morning or much solar radiation to start to affect the snow surface. Keep an eye out for roller balls and pin wheels and if the snow surfaces starts to look saturated move towards more shaded aspects especially if you chose to recreate in areas with terrain traps.
Avalanche and Weather Outlook
Avalanche conditions look to remain fairly consistent today other than the increase of loose wet activity later in the day. Several weak disturbances are expected through the start of next week bringing periods of light showers to the region.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next advisory on Tuesday, February 21, 2017.
Ski and ride safe.
The post Avalanche Advisory for February 18, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 21, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_150560362205060267templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_150560362205060267bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 21, 2017

View Full Advisory »

The current avalanche danger for the West Central Montana backcountry is CONSIDERABLE on wind loaded terrain above 7,000ft. Human triggered avalanchesare likely on steep wind loaded terrain at upper elevations. Below 7,000ft and on non-wind loaded terrain the avalanche danger is MODERATE, small human triggered avalanches are possible in specific areas.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for Tuesday, February 21, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
The northern part of the advisory area received 5-8 inches of snow in the past 24 hours, and has accumulated a total of 6-10 inches of snow since the storm system moved in late Sunday night. Strong mountain winds have been observed for the last 24 hours at Point 6 peaking yesterday evening at 33mph gusting to 53mph. Current winds this morning have shifted towards the west and have settled in the last few hours to calm. SWE’s for the past 24 hours are .6-.8 inches for the northern parts of the advisory area. The southern part of the region has accumulated 1-4 inches of snow and the winds were not as strong yesterday. At Deer Mountain the winds this morning are 10mph gusting to 16mph from the SE.
The primary avalanche concern today is wind slabs. Josh and I toured in the Rattlesnake yesterday and found small soft wind slabs forming early in the day that were already starting to have some shooting cracks and signs of instability in tests (Video). With significantly more snow becoming available for transport through the day and winds reaching gale force, wind slabs will have further developed and will be touchy today. Winds have shifted directions from easterly to westerly so wind slabs and cross-loading can potentially be found on any aspect. Wind slabs will be suspect today and traveling on wind loaded terrain is not advised.
Persistent weak layers are the secondary concern today. Buried surface hoar and near surface facets continue to fail with clean shears but are not propagating as readily. The persistent weak layers still warrant attention so take the time to dig to see if these layers are present and propagating. The facets and buried surface hoar continue to break down and have become very small and are hard to identify until you perform stability tests.
The third concern today will depend on where you are in the advisory area. In the northern half of the advisory area small soft storm slabs will be possible. A good amount of new snow paired with wind effect will take some time for the new snow to bond to the old snow surface. In the southern portion of the advisory area where less snow has fallen loose avalanches will be more of a concern in steeper terrain.
Avalanche and Weather Outlook
Snow continues to fall in the mountains and an additional few inches are expected today. With more snow, the avalanche danger will slowly increasing throughout the day. Cooler temperatures and more snow are in the forecast for the next couple of days as winter looks to return.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. The next regular advisory will be issued on Thursday, February 23, 2017.
Ski and ride safe.
The post Avalanche Advisory for February 21, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 23, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_2294599314899845832templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_2294599314899845832bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 23, 2017

View Full Advisory »

The current avalanche danger is MODERATE in the west central Montana backcountry above 6000 feet. Evaluate snow and terrain carefully; identify features of concern. Human triggered avalanches are possible. Below 6000 ft the avalanche danger is LOW.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for February 23, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 16 F to 26 F in the region. Winds are 4 mph with gusts of 6 mph out of the N in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 9 mph with gusts of 11 mph out of the NE. The forecast area received 1 to 4 inches of new snow in the last 24 hours. The new snow had SWE’s ranging from .1 to .3 inches of water.
Logan and I took sleds to the southern Missions near Seeley Lake yesterday. Tim and Greg toured near Lolo Pass. Snowbowl Ski Patrol did mitigation work. They reported ski cutting had limited results and slabs were stubborn to hand charges. Logan and I observed evidence of significant wind with the last storm. Leeward terrain was wind loaded. Tim and Greg found localized cracking on leeward slopes. The new snow is bonding to the old snow surfaces. The storm slab from the last storm is settling out. The near surface facets and buried surface hoar(our persistent weak layers) are becoming less reactive in pit tests(not propagating), and we have not had any recent avalanche activity on these layers. With valley temperatures reaching below freezing the lower elevation snowpack is less likely to produce loose wet releases.
The primary avalanche problem is wind slabs. Leeward terrain is wind loaded. During the last storm cycle, the winds shifted, look for typical ridgeline loading and for some slopes to have been cross loaded. Identify these slopes and avoid wind loaded terrain.
Strom slabs are the second avalanche concern today. The northern part of the advisory area received over 2 feet of new snow in the last 72 hours and the southern part got 16 new inches. These slabs are gaining strength and bonding to the snowpack.
The final avalanche problem is persistent weak layers. The near surface facets and buried surface hoar are becoming less reactive in pit tests. Also, these layers have not been present for any natural avalanche activity in the last week. In the Rattlesnake, these layers have been the most reactive. These layers are reactive in isolated areas. Dig a pit before committing to any steep terrain.
Avalanche and Weather Outlook
Valley temperatures should be below freezing, and light flurries for today and Friday. With these conditions expect the avalanche danger to decrease as the snowpack refreezes in the low elevations and the snowpack adjusts to the new snow above 6000 ft.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next advisory on February 25, 2017.
Ski and ride safe.
The post Avalanche Advisory for February 23, 2017 appeared first on Missoula Avalanche.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

Scott · Feb 27, 2017

</td></tr></tbody></table></td></tr><tr><td align="center" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;"><table width="600" id="m_-2571905656084118921templateBody" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="m_-2571905656084118921bodyContent" valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse; background-color: rgb(255, 255, 255);"><table width="100%" border="0" cellspacing="0" cellpadding="20"><tbody><tr><td valign="top" style="margin: 0px; font-family: arial, sans-serif; border-collapse: collapse;">

Avalanche Advisory for February 25, 2017

View Full Advisory »

The current avalanche danger is MODERATE in the west central Montana backcountry above 6000 feet. Evaluate snow and terrain carefully; identify features of concern. Human triggered avalanches are possible. Below 6000 ft the avalanche danger is LOW.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for February 25, 2017. This danger rating does not apply to operating ski areas, expires at midnight tonight and is the sole responsibility of the U.S. Forest Service.
Weather and Snowpack
Mountain temperatures range from 5 F to 18 F in the region. Winds are 2 mph with gusts of 4 mph out of the W in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading calm. The forecast area received 1 to 2 inches of new snow in the last 24 hours. The new snow had SWE’s ranging from .1 to .2 inches of water.
Logan and I toured in the Rattlesnake yesterday. We were not able to get any of our persistent weak layers to propagate. The storm snow is bonding to the old snow surfaces. We did observe some loose dry sluffs. Tim was at Downing Mountain Lodge in the central Bitterroot and found the storm snow was settling out.
The primary avalanche concern is persistent slabs. There are weak layers in our snowpack, these layers (graupel, near surface facets, and different crusts) have not propagated in our pit tests. Dig a pit to see if these layers are reactive before committing to a steep slope.
The second avalanche concern is loose dry releases on steep terrain. These should not be a problem to manage unless they knock you down and carry you into a terrain trap.
The final avalanche problem is wind slabs. These slabs are very stubborn to trigger. Wind slabs are in isolated areas in the region. Identify these slopes and avoid them.
Avalanche and Weather Outlook
Light mountain showers today until a cold front moves into the area on Sunday. This cold front will bring 3 to 7 inches of new snow to the mid elevations and up to 12 inches to the higher elevations. Wind is expected to accompany this front. Temperatures will remain cooler and expect additional accumulations on Monday. The cooler temperatures will keep this snow low density. With these conditions expect the avalanche danger to increase.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. I will issue the next advisory on February 28, 2017.
Ski and ride safe.

The post Avalanche Advisory for February 25, 2017 appeared first on Missoula Avalanche.

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.

</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table>

2016-17 W. Central Montana Avy conditions thread---"NO RATING"

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Scott Stiegler

Similar threads