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 2019-02-10
February 10, 2019 at 6:47

A foot of recent snow and extensive northeasterly winds have formed dangerous avalanche conditions. Observers yesterday noted numerous shooting cracks and collapses, breaking in fresh wind slabs and into older weak layers, from 1 to 4 feet deep.  Avoid wind loaded terrain and seek out softer, wind protected snow.

Whitefish Range
Click here to see the full advisory for 2019-02-10
February 10, 2019 at 6:47

A foot of recent snow and extensive northeasterly winds have formed dangerous avalanche conditions. Observers yesterday noted numerous shooting cracks and collapses, breaking in fresh wind slabs and into older weak layers, from 1 to 4 feet deep.  Avoid wind loaded terrain and seek out softer, wind protected snow.

Swan Range
Click here to see the full advisory for 2019-02-09
February 9, 2019 at 7:28

A grocery list of avalanche concerns today, with the greatest danger where snow accumulations are greatest and winds continue to blow. That’s generally areas closest to the Flathead Valley. Cold temperatures and bitter wind chills will complicate backcountry travel, decision-making, and rescue today. Keep it simple.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-09
February 9, 2019 at 6:46

A grocery list of avalanche concerns today, with the greatest danger where snow accumulations are greatest and winds continue to blow. That’s generally areas closest to the Flathead Valley. Cold temperatures and bitter wind chills will complicate backcountry travel, decision-making, and rescue today. Keep it simple.

Whitefish Range
Click here to see the full advisory for 2019-02-09
February 9, 2019 at 6:46

A grocery list of avalanche concerns today, with the greatest danger where snow accumulations are greatest and winds continue to blow. That’s generally areas closest to the Flathead Valley. Cold temperatures and bitter wind chills will complicate backcountry travel, decision-making, and rescue today. Keep it simple.

Swan Range
Click here to see the full advisory for 2019-02-08
February 8, 2019 at 6:22

Expect increasingly dangerous conditions today as new snow and cold northeast winds create fresh slabs and add weight to buried weak layers. Conservative decision making and cautious route-finding are required to travel in and near avalanche terrain. Dangerously cold windchill and decreasing visibility will complicate backcountry travel by this afternoon.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-08
February 8, 2019 at 6:21

Expect increasingly dangerous conditions today as new snow and cold northeast winds create fresh slabs and add weight to buried weak layers. Conservative decision making and cautious route-finding are required to travel safely in and near avalanche terrain. Dangerously cold windchill and decreasing visibility will complicate backcountry travel by this afternoon.

Whitefish Range
Click here to see the full advisory for 2019-02-08
February 8, 2019 at 6:21

Expect increasingly dangerous conditions today as new snow and cold northeast winds create fresh slabs and add weight to buried weak layers. Conservative decision making and cautious route-finding are required to travel safely in and near avalanche terrain. Dangerously cold windchill and decreasing visibility will complicate backcountry travel by this afternoon.

Swan Range
Click here to see the full advisory for 2019-02-07
February 7, 2019 at 6:04

Recent wind slabs 6” to 3’ deep sit atop weak snow and may be slow to heal. Steep open slopes below ridgelines and cross-loaded features are the greatest concern. Sheltered slopes will offer safer, better riding conditions. Cold temperatures will continue to increase the consequences of an accident.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-07
February 7, 2019 at 6:04

Recent wind slabs 6” to 3’ deep sit atop weak snow and may be slow to heal. Steep open slopes below ridgelines and cross-loaded features are the greatest concern. Sheltered slopes will offer safer, better riding conditions. Cold temperatures will continue to increase the consequences of an accident.

Whitefish Range
Click here to see the full advisory for 2019-02-07
February 7, 2019 at 6:04

Recent wind slabs 6” to 3’ deep sit atop weak snow and may be slow to heal. Steep open slopes below ridgelines and cross-loaded features are the greatest concern. Sheltered slopes will offer safer, better riding conditions. Cold temperatures will continue to increase the consequences of an accident.

Swan Range
Click here to see the full advisory for 2019-02-06
February 6, 2019 at 6:24

Recent human-triggered and natural wind slabs from 6" to 3' thick highlight the continued threat of slab avalanches in wind affected terrain.  You will find safer and softer riding conditions in wind protected terrain: Hunt for the low-density snow and mind your sluffs.    Cold temperatures will complicate a rescue or injury today. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-06
February 6, 2019 at 6:24

Recent human-triggered and natural wind slabs from 6" to 3' thick highlight the continued threat of slab avalanches in wind affected terrain.  You will find safer and softer riding conditions in wind protected terrain: Hunt for the low-density snow and mind your sluffs.    Cold temperatures will complicate a rescue or injury today. 

Whitefish Range
Click here to see the full advisory for 2019-02-06
February 6, 2019 at 6:24

Recent human-triggered and natural wind slabs from 6" to 3' thick highlight the continued threat of slab avalanches in wind affected terrain.  You will find safer and softer riding conditions in wind protected terrain: Hunt for the low-density snow and mind your sluffs.    Cold temperatures will complicate a rescue or injury today. 

Swan Range
Click here to see the full advisory for 2019-02-05
February 5, 2019 at 7:08

Surface instabilities involving the new and windblown snow are today's primary concern, especially in terrain where a small slide could knock you into trees or over rocks.  Larger and more dangerous wind slabs may exist in terrain that saw extensive wind transport during the past few days.  Pay attention to surface clues and recent wind drifting patterns before traveling in steep terrain.  Cold temperatures will complicate any kind of rescue or injury.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-05
February 5, 2019 at 7:08

Surface instabilities involving the new and windblown snow are today's primary concern, especially in terrain where a small slide could knock you into trees or over rocks.  Larger and more dangerous wind slabs may exist in terrain that saw extensive wind transport during the past few days.  Pay attention to surface clues and recent wind drifting patterns before traveling in steep terrain.  Cold temperatures will complicate any kind of rescue or injury.  

Whitefish Range
Click here to see the full advisory for 2019-02-05
February 5, 2019 at 7:08

Surface instabilities involving the new and windblown snow are today's primary concern, especially in terrain where a small slide could knock you into trees or over rocks.  Larger and more dangerous wind slabs may exist in terrain that saw extensive wind transport during the past few days.  Pay attention to surface clues and recent wind drifting patterns before traveling in steep terrain.  Cold temperatures will complicate any kind of rescue or injury.  

Swan Range
Click here to see the full advisory for 2019-02-04
February 4, 2019 at 7:03

Bitterly cold temperatures and breezy northerly winds are forming cold stiff slabs on atypical leeward aspects. Slabs are forming below ridgelines and in cross-loaded gullies on surfaces which may inhibit bonding. It remains possible for buried weak layers to become reactive as wind-deposited snow accumulates or from small wind slab avalanches. Expect to encounter hollow sounding snow which is a red flag that you are on a slab.  Areas sheltered from the wind offer a safer alternative. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-04
February 4, 2019 at 6:47

Bitterly cold temperatures and breezy northerly winds are forming cold stiff slabs on atypical leeward aspects. Slabs are forming below ridgelines and in cross-loaded gullies on surfaces which may inhibit bonding. It remains possible for buried weak layers to become reactive as wind-deposited snow accumulates or from small wind slab avalanches. Expect to encounter hollow sounding snow which is a red flag that you are on a slab.  Areas sheltered from the wind offer a safer alternative. 

Whitefish Range
Click here to see the full advisory for 2019-02-04
February 4, 2019 at 6:47

Bitterly cold temperatures and breezy northerly winds are forming cold stiff slabs on atypical leeward aspects. Slabs are forming below ridgelines and in cross-loaded gullies on surfaces which may inhibit bonding. It remains possible for buried weak layers to become reactive as wind-deposited snow accumulates or from small wind slab avalanches. Expect to encounter hollow sounding snow which is a red flag that you are on a slab.  Areas sheltered from the wind offer a safer alternative. 

Swan Range
Click here to see the full advisory for 2019-02-03
February 3, 2019 at 7:01

An Arctic intrusion entered our area overnight and strong easterly winds and light snow will continue through the day. Dangerous avalanche conditions are developing on atypical leeward aspects with fresh slab formation below ridgelines and in cross-loaded gullies. Wind-deposited snow, or small wind slab avalanches, may cause buried weak layers to become reactive. Look for signs of instability such as shooting cracks and whumpfing.  Areas sheltered from the wind offer a safer alternative. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-03
February 3, 2019 at 6:53

An Arctic intrusion entered our area overnight and strong easterly winds and light snow will continue through the day. Dangerous avalanche conditions are developing on atypical leeward aspects with fresh slab formation below ridgelines and in cross-loaded gullies. Wind-deposited snow, or small wind slab avalanches, may cause buried weak layers to become reactive. Look for signs of instability such as shooting cracks and whumpfing.  Areas sheltered from the wind offer a safer alternative. 

Whitefish Range
Click here to see the full advisory for 2019-02-03
February 3, 2019 at 6:53

An Arctic intrusion entered our area overnight and strong easterly winds and light snow will continue through the day. Dangerous avalanche conditions are developing on atypical leeward aspects with fresh slab formation below ridgelines and in cross-loaded gullies. Wind-deposited snow, or small wind slab avalanches, may cause buried weak layers to become reactive. Look for signs of instability such as shooting cracks and whumpfing.  Areas sheltered from the wind offer a safer alternative. 

Swan Range
Click here to see the full advisory for 2019-02-02
February 2, 2019 at 6:49

Complex avalanche conditions are developing today. Dense snow and strong southwest winds are forming slabs on the lee sides of ridges, gullies, and saddles. The new load is adding weight to fragile layers of surface hoar and facets buried between 1-2 feet deep at middle elevations. Prolonged warming is increasing the chances for loose wet avalanches. Watch for blowing snow, shooting cracks, and wet surface snow as red flags. The danger may rise as more snow accumulates tomorrow. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-02
February 2, 2019 at 6:49

Complex avalanche conditions are developing today. Dense snow and strong southwest winds are forming slabs on the lee sides of ridges, gullies, and saddles. The new load is adding weight to fragile layers of surface hoar and facets buried between 1-2 feet deep at middle elevations. Prolonged warming is increasing the chances for loose wet avalanches. Watch for blowing snow, shooting cracks, and wet surface snow as red flags. The danger may rise as more snow accumulates tomorrow. 

Whitefish Range
Click here to see the full advisory for 2019-02-02
February 2, 2019 at 6:49

Complex avalanche conditions are developing today. Dense snow and strong southwest winds are forming slabs on the lee sides of ridges, gullies, and saddles. The new load is adding weight to fragile layers of surface hoar and facets buried between 1-2 feet deep at middle elevations. Prolonged warming is increasing the chances for loose wet avalanches. Watch for blowing snow, shooting cracks, and wet surface snow as red flags. The danger may rise as more snow accumulates tomorrow. 

Swan Range
Click here to see the full advisory for 2019-02-01
February 1, 2019 at 6:24

It’s not quite Groundhog Day, but today seems a lot like the last few days. Primary danger? Mid-elevations, where you can still trigger slabs that break one to two feet deep on buried surface hoar. At upper elevations, gusty winds have been forming firm but small slabs sensitive to the weight of a snowmobile or person. The avalanche danger will rise with new snow and gusty winds overnight and this weekend.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-01
February 1, 2019 at 5:47

It’s not quite Groundhog Day, but today seems a lot like the last few days. Primary danger? Mid-elevations, where you can still trigger slabs that break one to two feet deep on buried surface hoar. At upper elevations, gusty winds have been forming firm but small slabs sensitive to the weight of a snowmobile or person. The avalanche danger will rise with new snow and gusty winds overnight and this weekend.

Whitefish Range
Click here to see the full advisory for 2019-02-01
February 1, 2019 at 5:47

It’s not quite Groundhog Day, but today seems a lot like the last few days. Primary danger? Mid-elevations, where you can still trigger slabs that break one to two feet deep on buried surface hoar. At upper elevations, gusty winds have been forming firm but small slabs sensitive to the weight of a snowmobile or person. The avalanche danger will rise with new snow and gusty winds overnight and this weekend.

Swan Range
Click here to see the full advisory for 2019-01-31
January 31, 2019 at 6:51

Two-step around the primary avalanche concerns today, and you can enjoy great riding. Steer around steep, shaded slopes at mid-elevations, where you can trigger slabs that break 1 to 2 feet deep on weak snow buried in mid-January.  Look for firm but thin slabs of drifted snow on leeward slopes at mid and upper elevations. A rider was caught and carried in a one of these slabs Wednesday. These slabs will grow thicker and more common with today's winds.

Whitefish Range

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