2017-18 West Central Montana Avy Conditions: 4/21/18--SECOND final forecast.
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Missoula Avalanche
Avalanche Special Update – Early Season Conditions – October 10, 2017
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Hi everyone, this is Travis Craft at the West Central Montana Avalanche Center with early season avalanche safety information issued Tuesday, October 10, 2017.
Snotel sites are slowly accumulating snow. With winter slowly taking over the higher elevations it is time to start thinking about avalanches and preparing for backcountry recreation.
In past years there have been a number of early season close calls and fatalities in Montana involving hunters and climbers. Hunters tend to travel solo without avalanche rescue equipment and avalanches are most likely the last thing they are thinking of as they follow elk tracks across steep, open terrain.
There was an avalanche fatality on Saturday, October 7th. The incident occurred on Imp Peak in the southern Madison Range, approximately 20 miles south of Big Sky. Two skiers were caught, one was fully buried and killed. This is the link to the accident details on the Gallatin National Forest Avalanche Center site.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the easy to use form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – October 10, 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.
Avalanche Special Update – Early Season Conditions – October 10, 2017
norating danger
View Full Advisory »
Hi everyone, this is Travis Craft at the West Central Montana Avalanche Center with early season avalanche safety information issued Tuesday, October 10, 2017.
Snotel sites are slowly accumulating snow. With winter slowly taking over the higher elevations it is time to start thinking about avalanches and preparing for backcountry recreation.
In past years there have been a number of early season close calls and fatalities in Montana involving hunters and climbers. Hunters tend to travel solo without avalanche rescue equipment and avalanches are most likely the last thing they are thinking of as they follow elk tracks across steep, open terrain.
There was an avalanche fatality on Saturday, October 7th. The incident occurred on Imp Peak in the southern Madison Range, approximately 20 miles south of Big Sky. Two skiers were caught, one was fully buried and killed. This is the link to the accident details on the Gallatin National Forest Avalanche Center site.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the easy to use form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – October 10, 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.
Missoula Avalanche
Avalanche Special Update – Early Season Conditions – November 2, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 02, 2017.
Mountain temperatures range from 23 F to 33 F in the region. Winds are 7 mph with gusts of 8 mph out of the South in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 4 mph with gusts of 8 mph out of the WSW. The region has picked up 4 to 10 new inches of snow in the last 24 hours. This storm is predicted to continue through the weekend with more snow and increasing winds. The backcountry weather forecast is now live on our weather page here is the link.
The primary avalanche problem is storm slabs. New snow will be reactive to human triggers. The second avalanche problem is wind slabs. Leeward terrain will have wind slabs.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
In past years there have been many early season close calls and fatalities in Montana involving skiers, hunters, and climbers. Make sure you have avalanche rescue gear (shovel, beacon, and probe). Hunters tend to travel solo without avalanche rescue equipment, and avalanches are most likely the last thing they are thinking of as they follow elk tracks across steep, open terrain.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 2, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Early Season Conditions – November 2, 2017
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View Full Advisory »
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 02, 2017.
Mountain temperatures range from 23 F to 33 F in the region. Winds are 7 mph with gusts of 8 mph out of the South in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 4 mph with gusts of 8 mph out of the WSW. The region has picked up 4 to 10 new inches of snow in the last 24 hours. This storm is predicted to continue through the weekend with more snow and increasing winds. The backcountry weather forecast is now live on our weather page here is the link.
The primary avalanche problem is storm slabs. New snow will be reactive to human triggers. The second avalanche problem is wind slabs. Leeward terrain will have wind slabs.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
In past years there have been many early season close calls and fatalities in Montana involving skiers, hunters, and climbers. Make sure you have avalanche rescue gear (shovel, beacon, and probe). Hunters tend to travel solo without avalanche rescue equipment, and avalanches are most likely the last thing they are thinking of as they follow elk tracks across steep, open terrain.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 2, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Early Season Conditions – November 10, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 10, 2017.
Mountain temperatures range from 22 F to 32 F in the region. Winds are 9 mph with gusts of 12 mph out of the South in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 8 mph with gusts of 11 mph out of the West. The region has picked up 1 to 3 new inches of snow in the last 24 hours. This storm is exiting the area and a new system will arrive over the weekend bringing snow above 4000 ft. The backcountry weather forecast is now live on our weather page here is the link.
Logan and I toured near Lost Trail Pass yesterday. We found wind scoured slopes and wind slabs on leeward terrain. Ryan went to St Mary’s in the Central Bitterroot on Nov 06. He found lots of snow viable for transport. We all found weak layers in our snow pits that should be accounted for by digging a pit to see how reactive they are before committing to any steep slopes.
The primary avalanche problem is wind slabs. These slabs are reactive to human triggers. Leeward terrain will have wind slabs that are likely to be reactive to human triggers. Logan I were able to get an interface of a wind slab and old snow to propagate in an ECT.
The second avalanche problem is storm slabs. New snow will need time to bond to old snow surfaces.
The third avalanche problem is persistent slabs. There are facets in our snow pack it is worth digging in the snow and seeing how reactive these layers are before committing to any steep terrain.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
In past years there have been many early season close calls and fatalities in Montana involving skiers, hunters, and climbers. Make sure you have avalanche rescue gear (shovel, beacon, and probe). Hunters tend to travel solo without avalanche rescue equipment, and avalanches are most likely the last thing they are thinking of as they follow elk tracks across steep, open terrain.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 10, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Early Season Conditions – November 10, 2017
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View Full Advisory »
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 10, 2017.
Mountain temperatures range from 22 F to 32 F in the region. Winds are 9 mph with gusts of 12 mph out of the South in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 8 mph with gusts of 11 mph out of the West. The region has picked up 1 to 3 new inches of snow in the last 24 hours. This storm is exiting the area and a new system will arrive over the weekend bringing snow above 4000 ft. The backcountry weather forecast is now live on our weather page here is the link.
Logan and I toured near Lost Trail Pass yesterday. We found wind scoured slopes and wind slabs on leeward terrain. Ryan went to St Mary’s in the Central Bitterroot on Nov 06. He found lots of snow viable for transport. We all found weak layers in our snow pits that should be accounted for by digging a pit to see how reactive they are before committing to any steep slopes.
The primary avalanche problem is wind slabs. These slabs are reactive to human triggers. Leeward terrain will have wind slabs that are likely to be reactive to human triggers. Logan I were able to get an interface of a wind slab and old snow to propagate in an ECT.
The second avalanche problem is storm slabs. New snow will need time to bond to old snow surfaces.
The third avalanche problem is persistent slabs. There are facets in our snow pack it is worth digging in the snow and seeing how reactive these layers are before committing to any steep terrain.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
In past years there have been many early season close calls and fatalities in Montana involving skiers, hunters, and climbers. Make sure you have avalanche rescue gear (shovel, beacon, and probe). Hunters tend to travel solo without avalanche rescue equipment, and avalanches are most likely the last thing they are thinking of as they follow elk tracks across steep, open terrain.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 10, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Early Season Conditions – November 18, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 18, 2017.
Mountain temperatures range from 19 F to 26 F in the region. Winds are 9 mph with gusts of 12 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 28 mph with gusts of 34 mph out of the West. The region has picked up 2 to 6 new inches of snow in the last 48 hours.
Tim and I toured near Lost Trail Pass yesterday in the southern Bitterroot. We saw active wind transport of snow loading leeward slopes with wind slabs. We also were able to get a layer of small-grained facets to propagate under the Halloween crust.
The primary avalanche problem is wind slabs. These slabs will be sensitive to human triggers and are located on leeward terrain. Winds have shifted in the last couple of days look for gullies to be cross-loaded and other unusual terrain to have wind slabs. The possibility also exists to trigger a wind slab and have it step down to a deeper weak layer in the snowpack causing a larger avalanche.
The second avalanche concern is persistent slabs. Tim and I were able to get a layer of small grain facets located below the Halloween crust to propagate in our stability tests. This layer is widespread in our snowpack and the only way to find it is to dig a pit and see how reactive it is in stability tests.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 18, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Early Season Conditions – November 18, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 18, 2017.
Mountain temperatures range from 19 F to 26 F in the region. Winds are 9 mph with gusts of 12 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 28 mph with gusts of 34 mph out of the West. The region has picked up 2 to 6 new inches of snow in the last 48 hours.
Tim and I toured near Lost Trail Pass yesterday in the southern Bitterroot. We saw active wind transport of snow loading leeward slopes with wind slabs. We also were able to get a layer of small-grained facets to propagate under the Halloween crust.
The primary avalanche problem is wind slabs. These slabs will be sensitive to human triggers and are located on leeward terrain. Winds have shifted in the last couple of days look for gullies to be cross-loaded and other unusual terrain to have wind slabs. The possibility also exists to trigger a wind slab and have it step down to a deeper weak layer in the snowpack causing a larger avalanche.
The second avalanche concern is persistent slabs. Tim and I were able to get a layer of small grain facets located below the Halloween crust to propagate in our stability tests. This layer is widespread in our snowpack and the only way to find it is to dig a pit and see how reactive it is in stability tests.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 18, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Early Season Conditions – November 21, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 21, 2017.
Mountain temperatures range from 26 F to 32 F in the region. Winds are 8 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 9 mph with gusts of 12 mph out of the SSW. The region has picked up 4 to 10 new inches of snow in the last 24 hours. The new snow had SWE’s ranging from .3 to 1.4 inches of water.
Josh and I toured in the Rattlesnake on Sunday before this storm entered our advisory area. We found wind slabs. We were able to get the facets under the Halloween crust to propagate in ECT’s.
Warming temperatures and rising freezing levels will increase the avalanche danger. Rain on snow will increase the Avalanche Danger. Natural avalanche activity will increase with the current and predicted weather.
The primary avalanche problem is storms slabs. The area received significant new snow. Monitor how well the new snow is bonding to older surfaces and avoid wind loaded slopes.
The second concern is persistent slabs. The layer of facets under the Halloween crust will be more reactive with new loading and rain added to the snowpack. You can reduce your risk by traveling on lower angled terrain.
The third avalanche problem will be loose wet releases. With rising temperatures and rain on our dry snowpack, loose wet releases will be triggered naturally and have the potential to become quite large. Pay attention to slopes above you.
With the current weather and predicted weather, the avalanche danger can change quickly.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 21, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Early Season Conditions – November 21, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for November 21, 2017.
Mountain temperatures range from 26 F to 32 F in the region. Winds are 8 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 9 mph with gusts of 12 mph out of the SSW. The region has picked up 4 to 10 new inches of snow in the last 24 hours. The new snow had SWE’s ranging from .3 to 1.4 inches of water.
Josh and I toured in the Rattlesnake on Sunday before this storm entered our advisory area. We found wind slabs. We were able to get the facets under the Halloween crust to propagate in ECT’s.
Warming temperatures and rising freezing levels will increase the avalanche danger. Rain on snow will increase the Avalanche Danger. Natural avalanche activity will increase with the current and predicted weather.
The primary avalanche problem is storms slabs. The area received significant new snow. Monitor how well the new snow is bonding to older surfaces and avoid wind loaded slopes.
The second concern is persistent slabs. The layer of facets under the Halloween crust will be more reactive with new loading and rain added to the snowpack. You can reduce your risk by traveling on lower angled terrain.
The third avalanche problem will be loose wet releases. With rising temperatures and rain on our dry snowpack, loose wet releases will be triggered naturally and have the potential to become quite large. Pay attention to slopes above you.
With the current weather and predicted weather, the avalanche danger can change quickly.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
The post Avalanche Special Update – Early Season Conditions – November 21, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Early Season Conditions – December 1, 2017
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for December 01 , 2017.
Mountain temperatures range from 18 F to 28 F in the region. Winds are 10 mph with gusts of 13 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 15 mph with gusts of 22 mph out of the WSW. The region has picked up 1 to 2 new inches of snow in the last 24 hours.
Logan and I went to Lolo Pass yesterday. We found 4 inches of new snow on a crust, with only a foot and half of the total depth
The warm temperatures and rain over thanksgiving defiantly have taken their toll on the depth of our snowpack. Most new snow is sitting on a crust, and the last couple of storms with low accumulations have created small wind slabs.
The primary avalanche problem is small wind slabs located on leeward terrain. These slabs will be small and localized to leeward terrain. They will be sensitive to triggers but small in size. Evaluate these slabs on small test slopes to check for sensitivity.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
Ski and ride safe.
Avalanche Special Update – Early Season Conditions – December 1, 2017
norating danger
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s early season update for December 01 , 2017.
Mountain temperatures range from 18 F to 28 F in the region. Winds are 10 mph with gusts of 13 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are reading 15 mph with gusts of 22 mph out of the WSW. The region has picked up 1 to 2 new inches of snow in the last 24 hours.
Logan and I went to Lolo Pass yesterday. We found 4 inches of new snow on a crust, with only a foot and half of the total depth
The warm temperatures and rain over thanksgiving defiantly have taken their toll on the depth of our snowpack. Most new snow is sitting on a crust, and the last couple of storms with low accumulations have created small wind slabs.
The primary avalanche problem is small wind slabs located on leeward terrain. These slabs will be small and localized to leeward terrain. They will be sensitive to triggers but small in size. Evaluate these slabs on small test slopes to check for sensitivity.
Across western Montana, there are backcountry locations that experienced wildfires during the 2017 season. Temporary emergency trail closures for the Lolo Peak (from the Mormon Ridge trailhead), Mill Creek and the Lantern Ridge trails. These burned areas, while sometimes opening up new skiable terrain, may also present hazards for backcountry skiers. Trees burned may have weakened or completely burned root systems. They could fall without warning – even in no wind conditions. Trees and other vegetation that may have anchored snow on steeper slopes in past years may now be completely burned. Downed trees from a fire can create unseen hazards on shallow snowpacks.
As always, be observant of conditions – not just the snowpack, but also what is above the snow when moving through a recently burned area, especially in strong and gusty winds.
If you see any of these obvious clues (listed below) signaling dangerous snow conditions, avoid being on or under open slopes steeper than 30 degrees.
Recent avalanche activity
Cracking or collapsing snowpack
Heavy snowfall
High winds
Rapid increase in temperature
If you spend any amount of time in the mountains in the winter, chances are good that you will encounter avalanche terrain. Having basic awareness of terrain, weather and snow factors goes a long way toward making good decisions in avalanche terrain. To assist you, we are offering several basic and advanced avalanche awareness classes this winter. We also have instructors available to provide your organization a range of programs from introductory lectures to classes with a field component.
Any information you can provide and send the WCMAC is appreciated and helps us inform the rest of the community about avalanche safety conditions. Please send a quick email to info@missoulaavalanche.org or complete the form here public observation.
We will update the advisory as the weather dictates and plan to begin issuing regular avalanche advisories with a danger rating in mid-December.
Ski and ride safe.
https://missoulaavalanche.org/advisories/6606-avalanche-advisory-for-12-16-2017/
Missoula Avalanche
Avalanche Advisory for December 16, 2017
moderate danger
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The current avalanche danger is MODERATE in the west central Montana backcountry. Evaluate snow and terrain carefully; identify features of concern. Human triggered avalanches are possible.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for December 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
Mountain temperatures range from 15 F to 27 F in the region. Winds are 8 mph with gusts of 14 mph out of the W in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 5 mph with gusts of 11 out of the WNW. The advisory area received 3 to 5 inches of snow.
Logan and I went to the southern Bitterroots on Thursday. We found near surface facets on the thanksgiving crust to be reactive in our pit tests. We also found surface hoar. The new snow has buried the surface hoar. These layers are throughout our advisory area at all elevations and aspects. Dig a pit to assess how reactive these layers are. Look for shooting cracks from skis and localized collapsing to identify avalanche hazards.
The primary avalanche problem is wind slabs. Leeward terrain has wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. Look for cross-loaded terrain as well as ridge tops.
The secondary avalanche problem is persistent slabs. The new snow will be stressing and burying layers of concern. The two layers of concern are the buried surface hoar and the near surface facets on top of the Thanksgiving crust. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
Avalanche and Weather Outlook
Snow will start to taper off by midday today and return with strong winds Sunday evening. With the addition of more snow and wind expect the avalanche danger to increase.
If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. I will issue a weather update tomorrow December 17, 2017.
Ski and ride safe.
The post Avalanche Advisory for December 16, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Advisory for December 16, 2017
moderate danger
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The current avalanche danger is MODERATE in the west central Montana backcountry. Evaluate snow and terrain carefully; identify features of concern. Human triggered avalanches are possible.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for December 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
Mountain temperatures range from 15 F to 27 F in the region. Winds are 8 mph with gusts of 14 mph out of the W in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 5 mph with gusts of 11 out of the WNW. The advisory area received 3 to 5 inches of snow.
Logan and I went to the southern Bitterroots on Thursday. We found near surface facets on the thanksgiving crust to be reactive in our pit tests. We also found surface hoar. The new snow has buried the surface hoar. These layers are throughout our advisory area at all elevations and aspects. Dig a pit to assess how reactive these layers are. Look for shooting cracks from skis and localized collapsing to identify avalanche hazards.
The primary avalanche problem is wind slabs. Leeward terrain has wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. Look for cross-loaded terrain as well as ridge tops.
The secondary avalanche problem is persistent slabs. The new snow will be stressing and burying layers of concern. The two layers of concern are the buried surface hoar and the near surface facets on top of the Thanksgiving crust. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
Avalanche and Weather Outlook
Snow will start to taper off by midday today and return with strong winds Sunday evening. With the addition of more snow and wind expect the avalanche danger to increase.
If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. I will issue a weather update tomorrow December 17, 2017.
Ski and ride safe.
The post Avalanche Advisory for December 16, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Weather – December 17, 2017
norating danger
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 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 8 F to 18 F in the region. Winds are 8 mph with gusts of 11 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 22 mph with gusts of 29 mph out of the WNW. The advisory area received 0 to 1 inches of snow in the last 24 hours.
The primary avalanche problem is wind slabs. Leeward terrain has wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. Look for cross-loaded terrain as well as ridge tops.
The secondary avalanche problem is persistent slabs. The new snow will be stressing and burying layers of concern. The two layers of concern are the buried surface hoar and the near surface facets on top of the Thanksgiving crust. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
Avalanche and Weather Outlook
A system is going to move into tonight with new snow and 50 mph ridge top winds. Look for the avalanche danger to rise when this storm moves in with the addition of new snow and strong winds.
The post Avalanche Special Update – Weather – December 17, 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.
Avalanche Special Update – Weather – December 17, 2017
norating danger
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 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 8 F to 18 F in the region. Winds are 8 mph with gusts of 11 mph out of the SSW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 22 mph with gusts of 29 mph out of the WNW. The advisory area received 0 to 1 inches of snow in the last 24 hours.
The primary avalanche problem is wind slabs. Leeward terrain has wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. Look for cross-loaded terrain as well as ridge tops.
The secondary avalanche problem is persistent slabs. The new snow will be stressing and burying layers of concern. The two layers of concern are the buried surface hoar and the near surface facets on top of the Thanksgiving crust. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
Avalanche and Weather Outlook
A system is going to move into tonight with new snow and 50 mph ridge top winds. Look for the avalanche danger to rise when this storm moves in with the addition of new snow and strong winds.
The post Avalanche Special Update – Weather – December 17, 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.
Missoula Avalanche
Avalanche Advisory for December 18, 2017
norating danger
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 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
Mountain temperatures range from 23 F to 33 F in the region. Winds are 10 mph with gusts of 19 mph out of the S in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 27 mph with gusts of 43 mph out of the W. The advisory area received 1 to 5 inches of snow in the last 24 hours. The new snow had SWE’s ranging from .1 to .7 inches of water.
The addition of new snow and wind overnight has increased the avalanche danger. Wind slabs will be larger and more sensitive to human triggers. The near surface facets will become more sensitive to triggers with the additional weight of the new snow. We got an observation yesterday before this storm from 7500 ft in the Missions, in the Grey Wolf area, 6 inch wind slabs that were sensitive to human triggers at 7500 feet (this is outside of the advisory area). Here is picture.
The primary avalanche problem is wind slabs. Leeward terrain and cross-loaded slopes will have wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. These slabs will be sensitive to human triggers.
The secondary avalanche problem is persistent slabs. The new snow will be stressing the layers of concern. The two layers of concern are the buried surface hoar and the near surface facets on top of the Thanksgiving crust. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
We will have a weather pattern that is active till Wednesday. With the addition of new snow and wind, the avalanche danger will increase throughout the day. If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. I will issue the next advisory with a danger rating tomorrow.
Ski and ride safe.
The post Avalanche Advisory for December 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.
Avalanche Advisory for December 18, 2017
norating danger
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 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
Mountain temperatures range from 23 F to 33 F in the region. Winds are 10 mph with gusts of 19 mph out of the S in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 27 mph with gusts of 43 mph out of the W. The advisory area received 1 to 5 inches of snow in the last 24 hours. The new snow had SWE’s ranging from .1 to .7 inches of water.
The addition of new snow and wind overnight has increased the avalanche danger. Wind slabs will be larger and more sensitive to human triggers. The near surface facets will become more sensitive to triggers with the additional weight of the new snow. We got an observation yesterday before this storm from 7500 ft in the Missions, in the Grey Wolf area, 6 inch wind slabs that were sensitive to human triggers at 7500 feet (this is outside of the advisory area). Here is picture.
The primary avalanche problem is wind slabs. Leeward terrain and cross-loaded slopes will have wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. These slabs will be sensitive to human triggers.
The secondary avalanche problem is persistent slabs. The new snow will be stressing the layers of concern. The two layers of concern are the buried surface hoar and the near surface facets on top of the Thanksgiving crust. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
We will have a weather pattern that is active till Wednesday. With the addition of new snow and wind, the avalanche danger will increase throughout the day. If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. I will issue the next advisory with a danger rating tomorrow.
Ski and ride safe.
The post Avalanche Advisory for December 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.
Missoula Avalanche
Avalanche Warning for December 20, 2017
high danger
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An avalanche warning is in effect for the northern portion of 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.
This is Logan King with an avalanche warning for Wednesday December 20th, 2017. This avalanche warning will expire at 6:00 am December 21st. The warning will either 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
Snotel data for The southern Missions, southern Swan, Rattlesnake and Central Bitterroot ranges shows a significant load over the last 36 hours. Mountain locations received between 1.0-2.4 inches of water and 10-20 inches of snow. Current mountain temps are in the 20’s and winds are calm at point six and in the low teens from the S at Deer Mountain.
The avalanche warning is in effect due to a significant load of new snow on a weak snowpack. The southern Missions, southern Swan, Rattlesnake and Central Bitterroot ranges have been subject to the brunt of the storm and will have an increased likelihood of avalanche activity. We received multiple reports of human triggered avalanches in the advisory area and the surrounding mountains. Dangerous avalanche conditions exist and travel in avalanche terrain is not recommended. The snow will need time to adjust to the load and for the new snow to bond.
Avalanche and Weather Outlook
Light snow is expected to continue through the day today with a brief break before starting again late Thursday leading to cold temperatures for the weekend. Conditions will not change until loading stops and the snow can settle.
The next advisory will be issued Thursday December 21st.
Ski and ride safe.
The post Avalanche Warning for December 20, 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.
Avalanche Warning for December 20, 2017
high danger
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An avalanche warning is in effect for the northern portion of 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.
This is Logan King with an avalanche warning for Wednesday December 20th, 2017. This avalanche warning will expire at 6:00 am December 21st. The warning will either 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
Snotel data for The southern Missions, southern Swan, Rattlesnake and Central Bitterroot ranges shows a significant load over the last 36 hours. Mountain locations received between 1.0-2.4 inches of water and 10-20 inches of snow. Current mountain temps are in the 20’s and winds are calm at point six and in the low teens from the S at Deer Mountain.
The avalanche warning is in effect due to a significant load of new snow on a weak snowpack. The southern Missions, southern Swan, Rattlesnake and Central Bitterroot ranges have been subject to the brunt of the storm and will have an increased likelihood of avalanche activity. We received multiple reports of human triggered avalanches in the advisory area and the surrounding mountains. Dangerous avalanche conditions exist and travel in avalanche terrain is not recommended. The snow will need time to adjust to the load and for the new snow to bond.
Avalanche and Weather Outlook
Light snow is expected to continue through the day today with a brief break before starting again late Thursday leading to cold temperatures for the weekend. Conditions will not change until loading stops and the snow can settle.
The next advisory will be issued Thursday December 21st.
Ski and ride safe.
The post Avalanche Warning for December 20, 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.
Missoula Avalanche
Avalanche Advisory for December 21, 2017
considerable danger
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The avalanche warning has expired and the current avalanche danger is CONSIDERABLE in the West Central Montana backcountry. Natural avalanches are possible and human triggered avalanches are likely across the region. Careful route finding and conservative decision-making are essential for backcountry travel today.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for December 21st, 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 has tapered off and the region received an additional 1-3 inches of snow overnight, adding another .1-.3 inches of water to the snowpack. Winds this morning at Deer Mountain are 7 mph gusting to 11 mph from the WNW. Temperatures early this morning are in the teens to low twenties.
Travis and I rode in Seeley Lake yesterday and Tim was in the Rattlesnake. We found a significant amount of new snow that lead to numerous natural and human triggered avalanches over the last few days. Widespread collapsing/whumphing was observed along with shooting cracks that traveled long distances. Avalanche activity is leveling off as the new snow bonds and the weak layers are adjusting to the load.
The primary avalanche problem today is persistent slabs. There are multiple layers of facets throughout the advisory area. Of greatest concern are the facets associated with the Thanksgiving crust. These facets were very reactive during the storm cycle and were responsible for the majority of large avalanches seen over the last few days. The persistent weak layers will continue to be sensitive to triggers and will produce large avalanches. Cautious evaluation and identification of this layer will be vital before committing to avalanche terrain.
The secondary avalanche concern today will be wind slabs. Winds were relatively calm with the storm but Tim reported finding beefy slabs that would result in large high consequence avalanches. Wind is forecast to increase today and through tonight as a cold front pushes into the region. Avoid steep terrain that appears to be wind loaded.
Storm Slabs are the final concern today. The storm slabs are bonding to the old snow surface and are becoming less reactive. Take the time to evaluate if the new/old snow interface is bonding.
Avalanche and Weather Outlook
Snow is expected to start this afternoon and continue into Friday as a cold front moves in dropping temperatures below zero. Conditions look to remain about the same as long as too much snow isn’t added too quickly to the snowpack.
If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. A weather update will be issued Friday. Ski and ride safe.
The post Avalanche Advisory for December 21, 2017 appeared first on Missoula Avalanche.
Avalanche Advisory for December 21, 2017
considerable danger
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The avalanche warning has expired and the current avalanche danger is CONSIDERABLE in the West Central Montana backcountry. Natural avalanches are possible and human triggered avalanches are likely across the region. Careful route finding and conservative decision-making are essential for backcountry travel today.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for December 21st, 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 has tapered off and the region received an additional 1-3 inches of snow overnight, adding another .1-.3 inches of water to the snowpack. Winds this morning at Deer Mountain are 7 mph gusting to 11 mph from the WNW. Temperatures early this morning are in the teens to low twenties.
Travis and I rode in Seeley Lake yesterday and Tim was in the Rattlesnake. We found a significant amount of new snow that lead to numerous natural and human triggered avalanches over the last few days. Widespread collapsing/whumphing was observed along with shooting cracks that traveled long distances. Avalanche activity is leveling off as the new snow bonds and the weak layers are adjusting to the load.
The primary avalanche problem today is persistent slabs. There are multiple layers of facets throughout the advisory area. Of greatest concern are the facets associated with the Thanksgiving crust. These facets were very reactive during the storm cycle and were responsible for the majority of large avalanches seen over the last few days. The persistent weak layers will continue to be sensitive to triggers and will produce large avalanches. Cautious evaluation and identification of this layer will be vital before committing to avalanche terrain.
The secondary avalanche concern today will be wind slabs. Winds were relatively calm with the storm but Tim reported finding beefy slabs that would result in large high consequence avalanches. Wind is forecast to increase today and through tonight as a cold front pushes into the region. Avoid steep terrain that appears to be wind loaded.
Storm Slabs are the final concern today. The storm slabs are bonding to the old snow surface and are becoming less reactive. Take the time to evaluate if the new/old snow interface is bonding.
Avalanche and Weather Outlook
Snow is expected to start this afternoon and continue into Friday as a cold front moves in dropping temperatures below zero. Conditions look to remain about the same as long as too much snow isn’t added too quickly to the snowpack.
If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. A weather update will be issued Friday. Ski and ride safe.
The post Avalanche Advisory for December 21, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Weather – December 22, 2017
norating danger
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Good morning, this is Logan King with the West Central Montana Avalanche Center’s weather and avalanche update for December 22nd, 2017.
Weather and Snowpack
Mountain temperatures are currently in the teens and the winds are out of the WNW. Wind speeds are around 10 mph gusting to 16 mph. Accumulating snow has resumed and snotels across the advisory area are reporting between 1-5 inches of low density snow.
The primary avalanche concern today will continue to be persistent slabs. The facets associated with the Thanksgiving crust continue to be reactive. We received multiple reports of slides being triggered on this layer yesterday.
The secondary avalanche problem is wind slabs. The low density snow will be easily transported by even light winds. With continued snow and stronger winds developing, windslabs will become increasingly problematic.
Avalanche and Weather Outlook
Snow is expected to continue through the day today and into tonight. Snow will be dry and light as temperatures are expected to drop. Winds will shift to the NE as the cold front moves in lowering temperatures to single digits.
The post Avalanche Special Update – Weather – December 22, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Weather – December 22, 2017
norating danger
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Good morning, this is Logan King with the West Central Montana Avalanche Center’s weather and avalanche update for December 22nd, 2017.
Weather and Snowpack
Mountain temperatures are currently in the teens and the winds are out of the WNW. Wind speeds are around 10 mph gusting to 16 mph. Accumulating snow has resumed and snotels across the advisory area are reporting between 1-5 inches of low density snow.
The primary avalanche concern today will continue to be persistent slabs. The facets associated with the Thanksgiving crust continue to be reactive. We received multiple reports of slides being triggered on this layer yesterday.
The secondary avalanche problem is wind slabs. The low density snow will be easily transported by even light winds. With continued snow and stronger winds developing, windslabs will become increasingly problematic.
Avalanche and Weather Outlook
Snow is expected to continue through the day today and into tonight. Snow will be dry and light as temperatures are expected to drop. Winds will shift to the NE as the cold front moves in lowering temperatures to single digits.
The post Avalanche Special Update – Weather – December 22, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Advisory for December 23, 2017
considerable danger
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The avalanche danger for the West Central Montana backcountry is CONSIDERABLE. Human triggered avalanches are likely. Careful snowpack and terrain evaluation remain important for safe backcountry travel.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for December 23rd, 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
An arctic cold front is flooding into the region dropping mountain temperatures to around zero in the northern portion of the advisory area. Further south, temperatures are in the low teens this morning. Scattered low density snow continues to fall and 1-4 inches have accumulated overnight. Winds are light this morning from the N.
Travis was in the Rattlesnake yesterday and I was up at Lolo Pass. We both found the primary concern to be persistent weak layers.
The primary avalanche problem today is persistent slabs. There are two distinct persistent weak layers of concern. Above 6,000 feet facets on the Thanksgiving crust continue to cause significant avalanche problems as indicated by multiple natural releases observed on this layer yesterday. Below 6,000 feet there is a spotty layer of buried surface hoar. You will need to dig and see if these layers are present and reactive. Carefully evaluate the snowpack before exposing yourself to avalanche terrain.
Loose snow avalanches are the secondary concern today. Loose snow avalanches are problematic due to the potential to step down and trigger a larger slide on one of the persistent weak layers or in steep terrain where terrain traps are present. Carefully identify features of concern and the resulting consequences of getting caught in a loose snow slide.
Avalanche and Weather Outlook
Snow will taper off today giving way to frigid temperatures before the next cycle of snow begins late Sunday. Avalanche conditions will not change much through the weekend.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. Ski and ride safe.
The post Avalanche Advisory for December 23, 2017 appeared first on Missoula Avalanche.
Avalanche Advisory for December 23, 2017
considerable danger
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The avalanche danger for the West Central Montana backcountry is CONSIDERABLE. Human triggered avalanches are likely. Careful snowpack and terrain evaluation remain important for safe backcountry travel.
Good morning, this is Logan King with the West Central Montana Avalanche Center’s avalanche advisory for December 23rd, 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
An arctic cold front is flooding into the region dropping mountain temperatures to around zero in the northern portion of the advisory area. Further south, temperatures are in the low teens this morning. Scattered low density snow continues to fall and 1-4 inches have accumulated overnight. Winds are light this morning from the N.
Travis was in the Rattlesnake yesterday and I was up at Lolo Pass. We both found the primary concern to be persistent weak layers.
The primary avalanche problem today is persistent slabs. There are two distinct persistent weak layers of concern. Above 6,000 feet facets on the Thanksgiving crust continue to cause significant avalanche problems as indicated by multiple natural releases observed on this layer yesterday. Below 6,000 feet there is a spotty layer of buried surface hoar. You will need to dig and see if these layers are present and reactive. Carefully evaluate the snowpack before exposing yourself to avalanche terrain.
Loose snow avalanches are the secondary concern today. Loose snow avalanches are problematic due to the potential to step down and trigger a larger slide on one of the persistent weak layers or in steep terrain where terrain traps are present. Carefully identify features of concern and the resulting consequences of getting caught in a loose snow slide.
Avalanche and Weather Outlook
Snow will taper off today giving way to frigid temperatures before the next cycle of snow begins late Sunday. Avalanche conditions will not change much through the weekend.
If you are out in the backcountry, please send us your observations, these are very helpful in producing the advisory. Ski and ride safe.
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Missoula Avalanche
Avalanche Special Update – Weather – December 25, 2017
norating danger
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Good morning and merry Christmas this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 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 8 F to 20 F in the region. Winds are 5 mph with gusts of 7 mph out of the SW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 17 mph with gusts of 21 mph out of the West. The advisory area received 3 to 7 inches of snow in the last 24 hours.
The addition of new snow to our poor snowpack structure will increase the avalanche danger.
Persistent slabs will continue to be the primary avalanche concern today. Facets on the Thanksgiving crust and buried surface hoar are the greatest concern not only because they are the most sensitive layers but because if they slide they will result in large avalanches. You will need to dig and see if these layers are present and reactive. Carefully evaluate the snowpack before exposing yourself to avalanche terrain.
Wind slabs are the second avalanche problem. Leeward terrain and cross-loaded slopes will have wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. These slabs will be sensitive to human triggers.
The post Avalanche Special Update – Weather – December 25, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Weather – December 25, 2017
norating danger
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Good morning and merry Christmas this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 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 8 F to 20 F in the region. Winds are 5 mph with gusts of 7 mph out of the SW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 17 mph with gusts of 21 mph out of the West. The advisory area received 3 to 7 inches of snow in the last 24 hours.
The addition of new snow to our poor snowpack structure will increase the avalanche danger.
Persistent slabs will continue to be the primary avalanche concern today. Facets on the Thanksgiving crust and buried surface hoar are the greatest concern not only because they are the most sensitive layers but because if they slide they will result in large avalanches. You will need to dig and see if these layers are present and reactive. Carefully evaluate the snowpack before exposing yourself to avalanche terrain.
Wind slabs are the second avalanche problem. Leeward terrain and cross-loaded slopes will have wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. These slabs will be sensitive to human triggers.
The post Avalanche Special Update – Weather – December 25, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Advisory for December 26, 2017
considerable danger
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The current avalanche danger is CONSIDERABLE in the West Central Montana backcountry. This means careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for December 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 -11 F to 23 F in the region. In the Bitterroot winds are 3 mph with gusts of 5 out of the W. In the northern part of the advisory area, at Point Six, winds are reading 6 mph with gusts of 22 mph out of the W. The forecast area received 3 to 6 inches of new snow in the last 24 hours.
We are still getting propagation in our pit tests throughout the advisory area. There was public observation of propagation in a pit near Lolo pass. See the full observation here.
The primary avalanche problem is persistent slabs. The new snow will stress our weak layers. We have poor snowpack structure throughout our advisory area. This means careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today. Look for clues from the snowpack, shooting cracks and localized collapsing. Dig a pit on low angle terrain in a safe spot out of runout zones to see how the layers are adjusting to the new load.
Avalanche and Weather Outlook
Today will be dry and then by Wednesday snow will move back into the forecast. The avalanche danger will stay the same until more snow comes to our area.
I will issue a weather update tomorrow.
Ski and ride safe.
The post Avalanche Advisory for December 26, 2017 appeared first on Missoula Avalanche.
Avalanche Advisory for December 26, 2017
considerable danger
View Full Advisory »
The current avalanche danger is CONSIDERABLE in the West Central Montana backcountry. This means careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for December 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 -11 F to 23 F in the region. In the Bitterroot winds are 3 mph with gusts of 5 out of the W. In the northern part of the advisory area, at Point Six, winds are reading 6 mph with gusts of 22 mph out of the W. The forecast area received 3 to 6 inches of new snow in the last 24 hours.
We are still getting propagation in our pit tests throughout the advisory area. There was public observation of propagation in a pit near Lolo pass. See the full observation here.
The primary avalanche problem is persistent slabs. The new snow will stress our weak layers. We have poor snowpack structure throughout our advisory area. This means careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today. Look for clues from the snowpack, shooting cracks and localized collapsing. Dig a pit on low angle terrain in a safe spot out of runout zones to see how the layers are adjusting to the new load.
Avalanche and Weather Outlook
Today will be dry and then by Wednesday snow will move back into the forecast. The avalanche danger will stay the same until more snow comes to our area.
I will issue a weather update tomorrow.
Ski and ride safe.
The post Avalanche Advisory for December 26, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Special Update – Weather – December 27, 2017
norating danger
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Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 27, 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 23 F in the region. Winds are 7 mph with gusts of 13 mph out of the SW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 20 mph with gusts of 28 mph out of the W. The advisory area received 2 to 4 inches of snow in the last 24 hours.
Primary avalanche problem is wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. Look for cross-loaded terrain as well as ridge tops.
The second avalanche problem is persistent slabs. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
The post Avalanche Special Update – Weather – December 27, 2017 appeared first on Missoula Avalanche.
Avalanche Special Update – Weather – December 27, 2017
norating danger
View Full Advisory »
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s weather and avalanche update for December 27, 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 23 F in the region. Winds are 7 mph with gusts of 13 mph out of the SW in the Bitterroot. Point Six, in the northern part of the advisory area, winds are 20 mph with gusts of 28 mph out of the W. The advisory area received 2 to 4 inches of snow in the last 24 hours.
Primary avalanche problem is wind slabs. Look for rounded pillows of snow near ridgelines and recognize signs of instability such as cracking in the surface snow. Look for cross-loaded terrain as well as ridge tops.
The second avalanche problem is persistent slabs. Dig a pit to assess how reactive these layers are before committing to any slope over 30 degrees.
The post Avalanche Special Update – Weather – December 27, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Advisory for December 28, 2017
considerable danger
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The current avalanche danger is CONSIDERABLE in the West central Montana backcountry on wind loaded slopes. This means careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today. All other slopes the danger is MODERATE. With changing weather conditions, the avalanche danger will rise.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for December 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
Mountain temperatures range from 16 F to 32 F in the region. In the Bitterroot winds are 4 mph with gusts of 5 out of the SSW. In the northern part of the advisory area, at Point Six, winds are reading 20 mph with gusts of 30 mph out of the W. The forecast area received 3 to 8 inches of new snow in the last 24 hours.
Steve and I toured in the Rattlesnake yesterday. We did get propagation on the Thanksgiving day crust. We did not get any collapsing or shooting cracks. We saw active transport of snow creating wind slabs. We have public observations from Gash Point in the Bitterroot and Lolo Pass. John Lehrman from Downing Mountain Lodge in the Central Bitterroot is worried about the tipping point that the facets on the Thanksgiving crust can take.
The primary avalanche problem in the Rattlesnake, southern Swans and southern Missions is wind slabs. These slabs will be sensitive to human triggers and grow in size throughout the day. The Bitterroot range will see this problem develop with wind speeds increasing in the storm.
The Primary avalanche problem in the Bitterroot is storm slabs. These slabs are increasing in size and are coming in upside-down. These slabs will be sensitive to human triggers and will grow throughout the day. The Rattlesnake, southern Swans, and southern Missions storm slabs will develop during the day with the addition of more snow.
The second avalanche problem throughout the advisory area is persistent slabs. These layers will become more reactive to triggers with the addition of new snow. We have poor snowpack structure throughout our advisory area. Look for clues from the snowpack shooting cracks and localized collapsing. Dig a pit on low angle terrain in a safe spot out of runout zones to see how the layers are adjusting to the new load.
Avalanche and Weather Outlook
The bottom line is the avalanche danger will increase today with new snow and wind. Pay close attention to changing conditions and reevaluate terrain choices throughout the day. Careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today. A potent storm is entering our area today. Here is a link to the discussion.
If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. I will issue a weather update tomorrow December 29, 2017.
Ski and ride safe.
The post Avalanche Advisory for December 28, 2017 appeared first on Missoula Avalanche.
Avalanche Advisory for December 28, 2017
considerable danger
View Full Advisory »
The current avalanche danger is CONSIDERABLE in the West central Montana backcountry on wind loaded slopes. This means careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today. All other slopes the danger is MODERATE. With changing weather conditions, the avalanche danger will rise.
Good morning, this is Travis Craft with the West Central Montana Avalanche Center’s avalanche advisory for December 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
Mountain temperatures range from 16 F to 32 F in the region. In the Bitterroot winds are 4 mph with gusts of 5 out of the SSW. In the northern part of the advisory area, at Point Six, winds are reading 20 mph with gusts of 30 mph out of the W. The forecast area received 3 to 8 inches of new snow in the last 24 hours.
Steve and I toured in the Rattlesnake yesterday. We did get propagation on the Thanksgiving day crust. We did not get any collapsing or shooting cracks. We saw active transport of snow creating wind slabs. We have public observations from Gash Point in the Bitterroot and Lolo Pass. John Lehrman from Downing Mountain Lodge in the Central Bitterroot is worried about the tipping point that the facets on the Thanksgiving crust can take.
The primary avalanche problem in the Rattlesnake, southern Swans and southern Missions is wind slabs. These slabs will be sensitive to human triggers and grow in size throughout the day. The Bitterroot range will see this problem develop with wind speeds increasing in the storm.
The Primary avalanche problem in the Bitterroot is storm slabs. These slabs are increasing in size and are coming in upside-down. These slabs will be sensitive to human triggers and will grow throughout the day. The Rattlesnake, southern Swans, and southern Missions storm slabs will develop during the day with the addition of more snow.
The second avalanche problem throughout the advisory area is persistent slabs. These layers will become more reactive to triggers with the addition of new snow. We have poor snowpack structure throughout our advisory area. Look for clues from the snowpack shooting cracks and localized collapsing. Dig a pit on low angle terrain in a safe spot out of runout zones to see how the layers are adjusting to the new load.
Avalanche and Weather Outlook
The bottom line is the avalanche danger will increase today with new snow and wind. Pay close attention to changing conditions and reevaluate terrain choices throughout the day. Careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential to recreate today. A potent storm is entering our area today. Here is a link to the discussion.
If you are out in the backcountry, please send us your observation, these are very helpful in producing the advisory. I will issue a weather update tomorrow December 29, 2017.
Ski and ride safe.
The post Avalanche Advisory for December 28, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Warning for December 29, 2017
high danger
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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.
This is Travis Craft with an avalanche warning for Friday, December 29th, 2017. This avalanche warning will expire at 6:00 am December 30, 2017. The warning will either 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 35 F in the region. In the Bitterroot winds are 2 mph with gusts of 5 out of the SSW. In the northern part of the advisory area, at Point Six, winds are reading 16 mph with gusts of 25 mph out of the W. The forecast area received 5 to 8 inches of new snow in the last 24 hours. The SWE totals range from .9 to 2.4 inches.
We are adding a significant new load to an already poor snowpack structure. Travel in avalanche terrain is not recommended today. This storm will continue through the weekend.
The primary concern is storm slabs. Heavy new snow sitting on weak lighter snow. These slabs will grow in size today. There is potential for these slides to fail and step down to our deeper weak layers in the snowpack.
The second avalanche problem is persistent slabs. These layers will be tested again with the addition of the new heavy snow.
I will issue the next advisory tomorrow December 30, 2017.
Ski and ride safe.
The post Avalanche Warning for December 29, 2017 appeared first on Missoula Avalanche.
Avalanche Warning for December 29, 2017
high danger
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.
This is Travis Craft with an avalanche warning for Friday, December 29th, 2017. This avalanche warning will expire at 6:00 am December 30, 2017. The warning will either 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 35 F in the region. In the Bitterroot winds are 2 mph with gusts of 5 out of the SSW. In the northern part of the advisory area, at Point Six, winds are reading 16 mph with gusts of 25 mph out of the W. The forecast area received 5 to 8 inches of new snow in the last 24 hours. The SWE totals range from .9 to 2.4 inches.
We are adding a significant new load to an already poor snowpack structure. Travel in avalanche terrain is not recommended today. This storm will continue through the weekend.
The primary concern is storm slabs. Heavy new snow sitting on weak lighter snow. These slabs will grow in size today. There is potential for these slides to fail and step down to our deeper weak layers in the snowpack.
The second avalanche problem is persistent slabs. These layers will be tested again with the addition of the new heavy snow.
I will issue the next advisory tomorrow December 30, 2017.
Ski and ride safe.
The post Avalanche Warning for December 29, 2017 appeared first on Missoula Avalanche.
Missoula Avalanche
Avalanche Warning for December 30, 2017
high danger
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. Avoid runout zones. Human triggered avalanches are very likely, and natural avalanches are likely.
This is Travis Craft with an avalanche warning for Saturday, December 30th, 2017. This avalanche warning will expire at 6:00 am December 31, 2017. The warning will either 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 35 F in the region. In the Bitterroot winds are calm. In the northern part of the advisory area, at Point Six, winds are reading 36 mph with gusts of 55 mph out of the W. The forecast area received 10 to 14 inches of new snow in the last 24 hours. The SWE totals range from 1 to 2.4 inches.
We are adding a significant new load to an already poor snowpack structure. We have reports of natural activity and triggered avalanches in the advisory area. Travel in avalanche terrain is not recommended today.
Josh and I went to the Rattlesnake yesterday and saw natural activity and had poor pit tests. The addition of strong winds today and more snow will keep the avalanche danger HIGH today. We are in a natural avalanche cycle.
The primary concern is storm slabs. Heavy new snow is sitting on weak lighter snow. These slabs will grow in size today. These slabs are large and will be sensitive to triggers. There is potential for these slides to fail and step down to our deeper weak layers in the snowpack.
The second avalanche problem is wind slabs. These slabs will be large and very sensitive to triggers. There is potential for these slides to fail and step down to our deeper weak layers in the snowpack.
The final avalanche problem is persistent slabs. We have a report of this layer being triggered in our advisory area. These slabs are very large and are possible to trigger.
Travel in avalanche terrain is not recommended today. Avoid runout zones.
Avalanche and Weather Outlook
The advisory area is in a natural avalanche cycle. We will continue to see strong winds and more loading today. The avalanche danger will be High. Avoid runout zones. Travel in avalanche terrain is not recommended today.
I will issue an update tomorrow.
Ski and ride safe.
The post Avalanche Warning for December 30, 2017 appeared first on Missoula Avalanche.
Avalanche Warning for December 30, 2017
high danger
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. Avoid runout zones. Human triggered avalanches are very likely, and natural avalanches are likely.
This is Travis Craft with an avalanche warning for Saturday, December 30th, 2017. This avalanche warning will expire at 6:00 am December 31, 2017. The warning will either 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 35 F in the region. In the Bitterroot winds are calm. In the northern part of the advisory area, at Point Six, winds are reading 36 mph with gusts of 55 mph out of the W. The forecast area received 10 to 14 inches of new snow in the last 24 hours. The SWE totals range from 1 to 2.4 inches.
We are adding a significant new load to an already poor snowpack structure. We have reports of natural activity and triggered avalanches in the advisory area. Travel in avalanche terrain is not recommended today.
Josh and I went to the Rattlesnake yesterday and saw natural activity and had poor pit tests. The addition of strong winds today and more snow will keep the avalanche danger HIGH today. We are in a natural avalanche cycle.
The primary concern is storm slabs. Heavy new snow is sitting on weak lighter snow. These slabs will grow in size today. These slabs are large and will be sensitive to triggers. There is potential for these slides to fail and step down to our deeper weak layers in the snowpack.
The second avalanche problem is wind slabs. These slabs will be large and very sensitive to triggers. There is potential for these slides to fail and step down to our deeper weak layers in the snowpack.
The final avalanche problem is persistent slabs. We have a report of this layer being triggered in our advisory area. These slabs are very large and are possible to trigger.
Travel in avalanche terrain is not recommended today. Avoid runout zones.
Avalanche and Weather Outlook
The advisory area is in a natural avalanche cycle. We will continue to see strong winds and more loading today. The avalanche danger will be High. Avoid runout zones. Travel in avalanche terrain is not recommended today.
I will issue an update tomorrow.
Ski and ride safe.
The post Avalanche Warning for December 30, 2017 appeared first on Missoula Avalanche.
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