Use this page to view archived advisories. The table below shows the overall danger rating and the bottom line for the 20 most recent advisories. Click on the time and date link above each danger rating icon to view the full advisory for that day. Use the date chooser or the pager at the bottom to scroll through the older advisories.

E.g., Thursday, November 21, 2024
E.g., Thursday, November 21, 2024
E.g., Thursday, November 21, 2024
Date the advisory was published:sort ascending Forecast Region
Click here to see the full advisory for 2020-01-14
January 14, 2020 at 5:25

You can trigger avalanches that break 1-2 feet thick where winds have drifted the recent snow into soft slabs. They'll be largest near ridges and summits, and most widespread on typically leeward slopes. Triggered sluffs of recent snow pose a serious danger on very steep slopes where the wind hasn't affected the surface snow. Pay close attention to surface conditions, so you can adjust your riding to match the hazard.

Swan Range
Click here to see the full advisory for 2020-01-13
January 13, 2020 at 7:33

Wind Slab avalanches pose a danger on steep slopes with slabs of drifted snow a foot or more thick, which may have formed in unusual spots. On very steep slopes where the snow surface remains loose and soft, triggered sluffs pose a danger above terrain traps. Lurking below the surface is weak snow near crusts; triggering slides on these layers remains possible. Stick to moderately-angled, sheltered slopes for good riding with less exposure to these hazards.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-13
January 13, 2020 at 6:23

Drifted snow or loose snow. Today's primary avalanche hazard will depend on surface conditions, and these will be highly variable, thanks to terrain-dependent wind conditions. Avoid steep slopes with slabs of drifted snow a foot or so thick. These may have formed in unusual spots. On very steep slopes where the snow surface remains loose and soft, triggered sluffs pose a danger above terrain traps. Stick to moderately-angled, sheltered slopes for good riding with less exposure to these hazards.

Whitefish Range
Click here to see the full advisory for 2020-01-13
January 13, 2020 at 6:23

Drifted snow or loose snow. Today's primary avalanche hazard will depend on surface conditions, and these will be highly variable, thanks to terrain-dependent wind conditions. Avoid steep slopes with slabs of drifted snow a foot or so thick. These may have formed in unusual spots. On very steep slopes where the snow surface remains loose and soft, triggered sluffs pose a danger above terrain traps. Stick to moderately-angled, sheltered slopes for good riding with less exposure to these hazards.

Swan Range
Click here to see the full advisory for 2020-01-12
January 12, 2020 at 7:10

Up to a foot of snow has stacked up, creating the potential for slab avalanches large enough to bury or injure you. Proceed with caution at mid and upper elevations as snow and wind continue to stress weak layers buried 2 to 3 feet deep. Collapses, shooting cracks, or blowing snow are signs to seek terrain with slope angles 30 degrees or less. Expect the danger to rise as another pulse of snow and wind approach our area this evening. 

Whitefish Range
Click here to see the full advisory for 2020-01-12
January 12, 2020 at 6:59

Up to a foot of snow has stacked up, creating slab avalanches large enough to bury or injure you. Proceed with caution at mid and upper elevations as snow and wind continue to stress weak layers buried 2 to 3 feet deep. Collapses, shooting cracks, or blowing snow are signs to seek terrain with slope angles 30 degrees or less. Expect the danger to rise as another pulse of snow and wind approach our area this evening. 

Swan Range
Click here to see the full advisory for 2020-01-12
January 12, 2020 at 6:59

Up to a foot of snow has stacked up, creating slab avalanches large enough to bury or injure you. Proceed with caution at mid and upper elevations as snow and wind continue to stress weak layers buried 2 to 3 feet deep. Collapses, shooting cracks, or blowing snow are signs to seek terrain with slope angles 30 degrees or less. Expect the danger to rise as another pulse of snow and wind approach our area this evening. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-11
January 11, 2020 at 7:06

The avalanche hazard will rise throughout the day. The obvious: as new snow stacks up, watch for loose dry and soft slab avalanches. Manage this by sticking to terrain with clean run-outs and away from steep, rocky avalanche chutes. The dangerous: persistent weak layers buried in our snowpack could wake up with the weight of a rider, new snow, or a smaller avalanche. Shooting cracks and collapses are signs to seek low angle terrain.

Swan Range
Click here to see the full advisory for 2020-01-11
January 11, 2020 at 7:06

The avalanche hazard will rise throughout the day. The obvious: as new snow stacks up, watch for loose dry and soft slab avalanches. Manage this by sticking to terrain with clean run-outs and away from steep, rocky avalanche chutes. The dangerous: persistent weak layers buried in our snowpack could wake up with the weight of a rider, new snow, or a smaller avalanche. Shooting cracks and collapses are signs to seek low angle terrain.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-11
January 11, 2020 at 7:03

The avalanche hazard will rise throughout the day. The obvious: as new snow stacks up, watch for loose dry and soft slab avalanches. Manage this by sticking to terrain with clean run-outs and away from steep, rocky avalanche chutes. The dangerous: persistent weak layers buried in our snowpack could wake up with the weight of a rider, new snow, or a smaller avalanche. Shooting cracks and collapses are signs to seek low angle terrain.

Whitefish Range
Click here to see the full advisory for 2020-01-10
January 10, 2020 at 7:11

Avalanche activity has quieted down since Wednesday, but there is potential for skiers or riders to trigger a slab avalanche several feet thick that fails on a buried crust or surface hoar layer.  Careful snowpack assessments and terrain selection are key.  Steep terrain with abrupt rollovers or previous wind-loading is where you are most likely to find lingering trouble.  A series of wintry storms are approaching the region starting this afternoon. The avalanche danger will rise overnight towards CONSIDERABLE.   

Swan Range
Click here to see the full advisory for 2020-01-10
January 10, 2020 at 7:09

Avalanche activity has quieted down since Wednesday, but there is potential for skiers or riders to trigger a slab avalanche several feet thick that fails on a buried crust or surface hoar layer.  Careful snowpack assessments and terrain selection are key.  Steep terrain with abrupt rollovers or previous wind-loading is where you are most likely to find lingering trouble.  A series of wintry storms are approaching the region starting this afternoon. The avalanche danger will rise overnight towards CONSIDERABLE.   

Whitefish Range
Click here to see the full advisory for 2020-01-10
January 10, 2020 at 7:09

Avalanche activity has quieted down since Wednesday, but there is potential for skiers or riders to trigger a slab avalanche several feet thick that fails on a buried crust or surface hoar layer.  Careful snowpack assessments and terrain selection are key.  Steep terrain with abrupt rollovers or previous wind-loading is where you are most likely to find lingering trouble.  A series of wintry storms are approaching the region starting this afternoon. The avalanche danger will rise overnight towards CONSIDERABLE.   

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-09
January 9, 2020 at 7:09

The natural cycle is over and the avalanche danger is trending down, but we aren't out of the woods yet.  Skiers and riders can still trigger large and dangerous avalanches that break several feet deep on weak layers that were buried at the start of the year.  Carefully assess the snowpack before moving into avalanche terrain, and choose shorter, lower consequence pitches over big terrain or terrain traps.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-09
January 9, 2020 at 6:31

The natural cycle is over and the avalanche danger is trending down, but we aren't out of the woods yet.  Skiers and riders can still trigger large and dangerous avalanches that break several feet deep on weak layers that were buried at the start of the year.  Carefully assess the snowpack before moving into avalanche terrain, and choose shorter, lower consequence pitches over big terrain or terrain traps.  

Whitefish Range
Click here to see the full advisory for 2020-01-09
January 9, 2020 at 6:31

The natural cycle is over and the avalanche danger is trending down, but we aren't out of the woods yet.  Skiers and riders can still trigger large and dangerous avalanches that break several feet deep on weak layers that were buried at the start of the year.  Carefully assess the snowpack before moving into avalanche terrain, and choose shorter, lower consequence pitches over big terrain or terrain traps.  

Swan Range
Click here to see the full advisory for 2020-01-08
January 8, 2020 at 6:48

Observers reported numerous natural and triggerd avalanches yesterday. New snow and strong winds will continue to create very dangerous avalanche conditions. Travel in or below avalanche terrain is not recommended, particularly at upper elevations. At lower elevations, stick to lower angled terrain and avoid exposure to avalanche terrain overhead. Collapses, shooting cracks, and recent natural avalanches are red flags. Blowing snow will point to the slopes where the most sensitive slabs are still forming.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-08
January 8, 2020 at 6:17

Observers reported numerous natural and triggerd avalanches yesterday. Today, you will need good self discipline, a conservative attitude, and strong hazard identification skills to travel safely in the mountains. New snow and winds will continue to create dangerous avalanche conditions. Stick to lower angled terrain with little overhead exposure. Collapses, shooting cracks, and recent natural avalanches are red flags. Blowing snow will point to the slopes where the most sensitive slabs are still forming.

Whitefish Range
Click here to see the full advisory for 2020-01-08
January 8, 2020 at 6:17

Observers reported numerous natural and triggerd avalanches yesterday. Today, you will need good self discipline, a conservative attitude, and strong hazard identification skills to travel safely in the mountains. New snow and winds will continue to create dangerous avalanche conditions. Stick to lower angled terrain with little overhead exposure. Collapses, shooting cracks, and recent natural avalanches are red flags. Blowing snow will point to the slopes where the most sensitive slabs are still forming.

Swan Range
Click here to see the full advisory for 2020-01-07
January 7, 2020 at 6:34

New and drifted snow will cause the danger to rise rapidly by this afternoon. Exercise more caution the higher up you go. Today, large avalanches can fail in the new snow and on buried weak layers. Rain and rising freezing levels may cause loose wet avalanches at lower elevations. Choosing low-angle slopes and simple terrain will help keep you safe.

Whitefish Range
Click here to see the full advisory for 2020-01-07
January 7, 2020 at 6:33

New and drifted snow will cause the danger to rise rapidly by this afternoon. Exercise more caution the higher up you go. Today, large avalanches can fail in the new snow and on buried weak layers. Rain and rising freezing levels may cause loose wet avalanches at lower elevations. Traveling at upper elevations is not recommended. Choosing low angle slopes and simple terrain will help keep you safe at lower elevations.

Swan Range
Click here to see the full advisory for 2020-01-07
January 7, 2020 at 6:33

New and drifted snow will cause the danger to rise rapidly by this afternoon. Exercise more caution the higher up you go. Today, large avalanches can fail in the new snow and on buried weak layers. Rain and rising freezing levels may cause loose wet avalanches at lower elevations. Traveling at upper elevations is not recommended. Choosing low angle slopes and simple terrain will help keep you safe at lower elevations.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-06
January 6, 2020 at 5:55

Today's hazards are avalanches that break 1 to 2 feet deep on old snow, or slides that involve recently-drifted snow at the snow surface. Both hazards are more widespread, with the potential to produce larger avalanches, at upper elevations. You can find safe riding that avoids these hazards on low angle, sheltered slopes at mid elevations. An approaching storm will bring sustained snowfall and yet more powerful winds tonight and tomorrow, with dangerous conditions expected by tomorrow morning. 

Whitefish Range
Click here to see the full advisory for 2020-01-06
January 6, 2020 at 5:55

Today's hazards are avalanches that break 1 to 2 feet deep on old snow, or slides that involve recently-drifted snow at the snow surface. Both hazards are more widespread, with the potential to produce larger avalanches, at upper elevations. You can find safe riding that avoids these hazards on low angle, sheltered slopes at mid elevations. An approaching storm will bring sustained snowfall and yet more powerful winds tonight and tomorrow, with dangerous conditions expected by tomorrow morning. 

Swan Range
Click here to see the full advisory for 2020-01-06
January 6, 2020 at 5:55

Today's hazards are avalanches that break 1 to 2 feet deep on old snow, or slides that involve recently-drifted snow at the snow surface. Both hazards are more widespread, with the potential to produce larger avalanches, at upper elevations. You can find safe riding that avoids these hazards on low angle, sheltered slopes at mid elevations. An approaching storm will bring sustained snowfall and yet more powerful winds tonight and tomorrow, with dangerous conditions expected by tomorrow morning. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-05
January 5, 2020 at 6:55

Steep terrain near upper elevation ridgelines harbors avalanche hazards that have developed in the past few weeks. You can find safe riding that avoids these hazards on low angle, sheltered slopes at mid elevations. If you climb onto higher terrain that's more exposed to the wind, stick to slopes less than about 35 degrees. Shooting cracks and whumpfing collapses are clear signs you can trigger avalanches large enough to bury or injure you.  

Whitefish Range
Click here to see the full advisory for 2020-01-05
January 5, 2020 at 6:55

Steep terrain near upper elevation ridgelines harbors avalanche hazards that have developed in the past few weeks. You can find safe riding that avoids these hazards on low angle, sheltered slopes at mid elevations. If you climb onto higher terrain that's more exposed to the wind, stick to slopes less than about 35 degrees. Shooting cracks and whumpfing collapses are clear signs you can trigger avalanches large enough to bury or injure you.  

Swan Range
Click here to see the full advisory for 2020-01-05
January 5, 2020 at 6:55

Steep terrain near upper elevation ridgelines harbors avalanche hazards that have developed in the past few weeks. You can find safe riding that avoids these hazards on low angle, sheltered slopes at mid elevations. If you climb onto higher terrain that's more exposed to the wind, stick to slopes less than about 35 degrees. Shooting cracks and whumpfing collapses are clear signs you can trigger avalanches large enough to bury or injure you.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-04
January 4, 2020 at 7:06

As new snow and winds add stress to the snowpack, concern remains for dangerous avalanches to break 1 to 2 feet deep. As you gain elevation, this problem will become more likely to trigger. Seek wind-sheltered, low angle terrain if you experience blowing snow at ridgelines or collapses and shooting cracks underfoot. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2020-01-04
January 4, 2020 at 7:02

As new snow and winds add stress to the snowpack, concern remains for dangerous avalanches to break 1 to 2 feet deep. As you gain elevation, this problem will become more possible to trigger. Seek wind-sheltered, lower angle terrain if you experience blowing snow at ridgelines or collapses and shooting cracks underfoot. 

Whitefish Range

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