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 2019-03-02
March 2, 2019 at 6:56

NE winds have formed wind slabs on unusual slopes. Unusual loading means more uncertainty and more potential for unexpected avalanches. Human-triggered wind slab avalanches are possible today. If you want to decrease your exposure to avalanche hazard and poor snow conditions, sniff out soft snow in wind protected areas and you should find the safest and best riding conditions.

Whitefish Range
Click here to see the full advisory for 2019-03-01
March 1, 2019 at 7:12

Shifting winds and light new snow mean new wind slabs for today in areas exposed to the winds and the potential for loose dry avalanches on steep slopes in sheltered areas. Human triggered avalanches are possible today and could have consequences. Identify where wind slabs and wind-affected snow may exist. These areas will hold more complicated and potentially hazardous conditions. Softer, more consistent snow and less avalanche hazard should exist on sheltered lower angle slopes. 

Swan Range
Click here to see the full advisory for 2019-03-01
March 1, 2019 at 7:12

Shifting winds and light new snow mean new wind slabs for today in areas exposed to the winds and the potential for loose dry avalanches on steep slopes in sheltered areas. Human triggered avalanches are possible today and could have consequences. Identify where wind slabs and wind-affected snow may exist. These areas will hold more complicated and potentially hazardous conditions. Softer, more consistent snow and less avalanche hazard should exist on sheltered lower angle slopes. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-01
March 1, 2019 at 6:55

Shifting winds and light new snow mean new wind slabs today in areas exposed to the winds and the potential for loose dry avalanches on steep slopes in sheltered areas. Human triggered avalanches are likely today and could have serious consequences. Identify where wind slabs and wind-affected snow exist, and avoid those slopes in favor of more sheltered lower angled slopes. That strategy can help you to find better recreation conditions and expose your party to less potential avalanche hazards.

Whitefish Range
Click here to see the full advisory for 2019-02-28
February 28, 2019 at 5:49

The hazard posed by wind slabs that formed earlier this weak is diminishing, though the avalanche danger will rise again late today as new snow and winds create a new generation of wind slabs. The safest, best riding is in wind-sheltered terrain, though you may have to hunt and peck for long lines of undisturbed snow. Avoid steep slopes with dense deposits of drifted snow or where blowing snow is forming soft, cohesive slabs

Swan Range
Click here to see the full advisory for 2019-02-28
February 28, 2019 at 5:49

The hazard posed by wind slabs that formed earlier this weak is diminishing, though the avalanche danger will rise again late today as new snow and winds create a new generation of wind slabs. The safest, best riding is in wind-sheltered terrain, though you may have to hunt and peck for long lines of undisturbed snow. Avoid steep slopes with dense deposits of drifted snow or where blowing snow is forming soft, cohesive slabs

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-28
February 28, 2019 at 5:49

The hazard posed by wind slabs that formed earlier this weak is diminishing, though the avalanche danger will rise again late today as new snow and winds create a new generation of wind slabs. The safest, best riding is in wind-sheltered terrain, though you may have to hunt and peck for long lines of undisturbed snow. Avoid steep slopes with dense deposits of drifted snow or where blowing snow is forming soft, cohesive slabs

Whitefish Range
Click here to see the full advisory for 2019-02-27
February 27, 2019 at 6:41

You can find trouble today, but you’ll have to look for it. The safest, best riding is in terrain sheltered from the wind. If you stray from this terrain, you might find the exceptions: steep slopes where recent winds have drifted snow into slabs sensitive to a person’s weight. Return to the better alternatives if you encounter small drifts behind trees, branches empty of snow, and dense, harder snow underfoot or under your sled.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-27
February 27, 2019 at 6:41

You can find trouble today, but you’ll have to look for it. The safest, best riding is in terrain sheltered from the wind. If you stray from this terrain, you might find the exceptions: steep slopes where recent winds have drifted snow into slabs sensitive to a person’s weight. Return to the better alternatives if you encounter small drifts behind trees, branches empty of snow, and dense, harder snow underfoot or under your sled.

Whitefish Range
Click here to see the full advisory for 2019-02-27
February 27, 2019 at 6:41

You can find trouble today, but you’ll have to look for it. The safest, best riding is in terrain sheltered from the wind. If you stray from this terrain, you might find the exceptions: steep slopes where recent winds have drifted snow into slabs sensitive to a person’s weight. Return to the better alternatives if you encounter small drifts behind trees, branches empty of snow, and dense, harder snow underfoot or under your sled.

Swan Range
Click here to see the full advisory for 2019-02-26
February 26, 2019 at 7:06

The onslaught of northeast winds and bitterly cold wind chill continues. The snowpack is generally stable in the Flathead Range and Glacier Park, but watch for isolated areas where the wind has been transporting snow. Areas sheltered from the wind will hold safer and higher quality snow. Buried weak layers remain a concern in areas with a thin snowpack. Steer around convexities in favor of planar well-supported slopes.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-26
February 26, 2019 at 6:59

The onslaught of northeast winds and bitterly cold wind chill continues. Expect to encounter unusual loading patterns at all elevations, with fresh slabs identifiable by cracking and collapsing. Areas sheltered from the wind will hold safer and higher quality snow. Buried weak layers remain a concern in areas with a thin snowpack. Steer around convexities in favor of planar, well-supported slopes.

Whitefish Range
Click here to see the full advisory for 2019-02-26
February 26, 2019 at 6:59

The onslaught of northeast winds and bitterly cold wind chill continues. Expect to encounter unusual loading patterns at all elevations, with fresh slabs identifiable by cracking and collapsing. Areas sheltered from the wind will hold safer and higher quality snow. Buried weak layers remain a concern in areas with a thin snowpack. Steer around convexities in favor of planar, well-supported slopes.

Swan Range
Click here to see the full advisory for 2019-02-25
February 25, 2019 at 7:02

Continued northeast winds will drift snow in unique loading patterns at all elevations. Look for blowing snow with cracking and collapsing signs of instability. Areas sheltered from the wind will hold safer and higher quality snow. Triggering a Persistent Slab avalanche is a low-likelihood, high-consequence problem that is best managed through terrain selection. Avoid convexities while seeking out planar well-supported slopes with a uniform snow cover.



 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-25
February 25, 2019 at 6:05

Continued northeast winds will drift snow in unique loading patterns at all elevations. Look for blowing snow with cracking and collapsing signs of instability. Areas sheltered from the wind will hold safer and higher quality snow. Triggering a Persistent Slab avalanche is a low-likelihood, high-consequence problem that is best managed through terrain selection. Avoid convexities while seeking out planar well-supported slopes with a uniform snow cover.



 

Whitefish Range
Click here to see the full advisory for 2019-02-25
February 25, 2019 at 6:05

Continued northeast winds will drift snow in unique loading patterns at all elevations. Look for blowing snow with cracking and collapsing signs of instability. Areas sheltered from the wind will hold safer and higher quality snow. Triggering a Persistent Slab avalanche is a low-likelihood, high-consequence problem that is best managed through terrain selection. Avoid convexities while seeking out planar well-supported slopes with a uniform snow cover.



 

Swan Range
Click here to see the full advisory for 2019-02-24
February 24, 2019 at 6:58

Human triggered storm slabs are possible where the surface snow has settled into a cohesive slab. Long running sluffs are possible in very steep terrain. Watch for cracking in denser snow and be wary of steep slopes above terrain traps. Very large persistent slab avalanches remain a concern. Seek out well supported, concave slopes with a deep, uniform snow cover to best avoid that larger problem.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-24
February 24, 2019 at 6:44

Human triggered storm slabs are possible where the surface snow has settled into a cohesive slab. Long running sluffs are possible in very steep terrain. Watch for cracking in denser snow and be wary of steep slopes above terrain traps. Very large persistent slab avalanches remain a concern. Seek out well supported, concave slopes with a deep, uniform snow cover to best avoid that larger problem.

Whitefish Range
Click here to see the full advisory for 2019-02-24
February 24, 2019 at 6:44

Human triggered storm slabs are possible where the surface snow has settled into a cohesive slab. Long running sluffs are possible in very steep terrain. Watch for cracking in denser snow and be wary of steep slopes above terrain traps. Very large persistent slab avalanches remain a concern. Seek out well supported, concave slopes with a deep, uniform snow cover to best avoid that larger problem.

Swan Range
Click here to see the full advisory for 2019-02-23
February 23, 2019 at 6:47

Up to a foot of new snow and changing winds are creating obvious instabilities on the snow surface. Expect drifts that can break up to a foot or more deep on steep, leeward slopes. Watch for blowing snow and cracking in denser snow as red flags. Less obvious is the continuing threat of persistent slab avalanches. Choose lower angled terrain that is planar, or concave, and has uniform snow cover to reduce your risk to this dangerously large problem.

Whitefish Range
Click here to see the full advisory for 2019-02-23
February 23, 2019 at 6:47

New snow and changing winds are creating obvious instabilities on the snow surface. Expect drifts that can break up to a foot or more deep on steep, leeward slopes. Watch for blowing snow and cracking in denser snow as red flags. Less obvious is the continuing possibility of persistent slab avalanches. Choose lower angled terrain that is planar, or concave, and has uniform snow cover to reduce your risk to this dangerously large problem.

Swan Range
Click here to see the full advisory for 2019-02-23
February 23, 2019 at 6:47

New snow and changing winds are creating obvious instabilities on the snow surface. Expect drifts that can break up to a foot or more deep on steep, leeward slopes. Watch for blowing snow and cracking in denser snow as red flags. Less obvious is the continuing possibility of persistent slab avalanches. Choose lower angled terrain that is planar, or concave, and has uniform snow cover to reduce your risk to this dangerously large problem.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-22
February 22, 2019 at 7:06

Pay attention to signs of fresh wind drifting as you gain elevation today: winds have increased out of the south.  Weak layers buried 2 to 4 feet deep continue to hint at lingering instabilities, particularly in the Whitefish Range, where a skier escaped a very large persistent slab on Wednesday.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-22
February 22, 2019 at 7:06

Pay attention to signs of fresh wind drifting as you gain elevation today: winds have increased out of the south.  Weak layers buried 2 to 4 feet deep continue to hint at lingering instabilities, particularly in the Whitefish Range, where a skier escaped a very large persistent slab on Wednesday.  

Swan Range
Click here to see the full advisory for 2019-02-22
February 22, 2019 at 6:55

Pay attention to signs of fresh wind drifting as you gain elevation today: winds have increased out of the south.  Weak layers buried 2 to 4 feet deep continue to hint at lingering instabilities, particularly in the Whitefish Range, where a skier escaped a very large persistent slab on Wednesday.  

Whitefish Range
Click here to see the full advisory for 2019-02-21
February 21, 2019 at 7:07

We have had more near misses and accidentally-triggered large slides in the past week than the rest of the winter combined.  Many of these have involved solo travel. While the danger posed by buried weak layers and wind slabs is not widespread, it continues to catch people by surprise.  To hedge your bets against drawing a joker, grab a partner, carefully assess the snowpack and choose simpler, concave terrain that is out of the wind. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-21
February 21, 2019 at 7:07

We have had more near misses and accidentally-triggered large slides in the past week than the rest of the winter combined.  Many of these have involved solo travel. While the danger posed by buried weak layers and wind slabs is not widespread, it continues to catch people by surprise.  To hedge your bets against drawing a joker, grab a partner, carefully assess the snowpack and choose simpler, concave terrain that is out of the wind. 

Swan Range
Click here to see the full advisory for 2019-02-21
February 21, 2019 at 6:58

We have had more near misses and accidentally-triggered large slides in the past week than the rest of the winter combined.  Many of these have involved solo travel.  While the danger posed by buried weak layers and wind slabs is not widespread, it continues to catch people by surprise.  To hedge your bets against drawing a joker, grab a partner, carefully assess the snowpack and choose simpler, concave terrain that is out of the wind. 

Whitefish Range
Click here to see the full advisory for 2019-02-20
February 20, 2019 at 6:19

You can trigger dangerous slabs of drifted or wind-stiffened snow a foot or more deep on steep mid- and upper-elevation slopes. It’s also possible to trigger slides that break much deeper, on weak layers around buried crusts. The safest slopes are those free from drifted snow, convexities, and terrain traps. The danger may rise later today and tonight as increasing wind speeds drift more snow and form larger, more widespread slabs.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-02-20
February 20, 2019 at 6:19

You can trigger dangerous slabs of drifted or wind-stiffened snow a foot or more deep on steep mid- and upper-elevation slopes. It’s also possible to trigger slides that break much deeper, on weak layers around buried crusts. The safest slopes are those free from drifted snow, convexities, and terrain traps. The danger may rise later today and tonight as increasing wind speeds drift more snow and form larger, more widespread slabs.

Whitefish Range

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