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., Friday, March 22, 2019
E.g., Friday, March 22, 2019
E.g., Friday, March 22, 2019
Date the advisory was published:sort ascending Forecast Region
Click here to see the full advisory for 2019-03-22
March 22, 2019 at 6:55

An AVALANCHE WARNING is in effect until 8pm for all areas. The avalanche danger will rise to HIGH as a result of unusual and prolonged warming. We expect more wet snow avalanches that are large, destructive, and can run long distances. Many avalanches have entrained the entire season’s snowpack. Travel in, or under, avalanche terrain is not recommended.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-22
March 22, 2019 at 6:55

An AVALANCHE WARNING is in effect until 8pm for all areas. The avalanche danger will rise to HIGH as a result of unusual and prolonged warming. We expect more wet snow avalanches that are large, destructive, and can run long distances. Many avalanches have entrained the entire season’s snowpack. Travel in, or under, avalanche terrain is not recommended.

Whitefish Range
Click here to see the full advisory for 2019-03-22
March 22, 2019 at 6:55

An AVALANCHE WARNING is in effect until 8pm for all areas. The avalanche danger will rise to HIGH as a result of unusual and prolonged warming. We expect more wet snow avalanches that are large, destructive, and can run long distances. Many avalanches have entrained the entire season’s snowpack. Travel in, or under, avalanche terrain is not recommended.

Swan Range
Click here to see the full advisory for 2019-03-21
March 21, 2019 at 6:13

The avalanche danger is directly related to unusual and prolonged warming. The danger will rise to HIGH. We expect more wet snow avalanches that are large, destructive, and that can run long distances. Start and finish your day early. Plan to avoid avalanche terrain as the day warms up.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-21
March 21, 2019 at 6:13

The avalanche danger is directly related to unusual and prolonged warming. The danger will rise to HIGH. We expect more wet snow avalanches that are large, destructive, and that can run long distances. Start and finish your day early. Plan to avoid avalanche terrain as the day warms up.

Whitefish Range
Click here to see the full advisory for 2019-03-21
March 21, 2019 at 6:13

The avalanche danger is directly related to unusual and prolonged warming. The danger will rise to HIGH. We expect more wet snow avalanches that are large, destructive, and that can run long distances. Start and finish your day early. Plan to avoid avalanche terrain as the day warms up.

Swan Range
Click here to see the full advisory for 2019-03-20
March 20, 2019 at 5:37

Here comes the hottest day so far!  Start and finish your day early, and move towards shady aspects as the day warms up.  The avalanche danger will rise to CONSIDERABLE.  We are expecting more large and dangerous natural wet avalanches this afternoon.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-20
March 20, 2019 at 5:37

Here comes the hottest day so far!  Start and finish your day early, and move towards shady aspects as the day warms up.  The avalanche danger will rise to CONSIDERABLE.  We are expecting more large and dangerous natural wet avalanches this afternoon.  

Whitefish Range
Click here to see the full advisory for 2019-03-20
March 20, 2019 at 5:37

Here comes the hottest day so far!  Start and finish your day early, and move towards shady aspects as the day warms up.  The avalanche danger will rise to CONSIDERABLE.  We are expecting more large and dangerous natural wet avalanches this afternoon.  

Swan Range
Click here to see the full advisory for 2019-03-19
March 19, 2019 at 6:27

The intensifying heatwave will lead to another day of wet avalanche activity. Large, dangerous wet loose slides have occurred each of the past three days. While the snowpack is generally stable this morning, the avalanche danger will rise with prolonged sunshine. Unsupportable, mashed potato-like snow is a clear sign of instability. Safer and higher quality snow can be found on shaded slopes.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-19
March 19, 2019 at 6:27

The intensifying heatwave will lead to another day of wet avalanche activity. Large, dangerous wet loose slides have occurred each of the past three days. While the snowpack is generally stable this morning, the avalanche danger will rise with prolonged sunshine. Unsupportable, mashed potato-like snow is a clear sign of instability. Safer and higher quality snow can be found on shaded slopes.  

Whitefish Range
Click here to see the full advisory for 2019-03-19
March 19, 2019 at 6:27

The intensifying heatwave will lead to another day of wet avalanche activity. Large, dangerous wet loose slides have occurred each of the past three days. While the snowpack is generally stable this morning, the avalanche danger will rise with prolonged sunshine. Unsupportable, mashed potato-like snow is a clear sign of instability. Safer and higher quality snow can be found on shaded slopes.  

Swan Range
Click here to see the full advisory for 2019-03-18
March 18, 2019 at 7:09

Another day of warm sunny conditions will increase the threat of wet avalanches. Large, dangerous wet loose slides occurred yesterday and will become more widespread today.  While the snowpack is generally stable this morning, the avalanche danger will rise with prolonged sunshine. Unsupportable, mushy snow or rollerballs are signs to move to shaded or lower angled slopes. Safer and higher quality snow can be found on shaded slopes.  

Whitefish Range
Click here to see the full advisory for 2019-03-18
March 18, 2019 at 7:09

Another day of warm sunny conditions will increase the threat of wet avalanches. Large, dangerous wet loose slides occurred yesterday and will become more widespread today.  While the snowpack is generally stable this morning, the avalanche danger will rise with prolonged sunshine. Unsupportable, mushy snow or rollerballs are signs to move to shaded or lower angled slopes. Safer and higher quality snow can be found on shaded slopes.  

Swan Range
Click here to see the full advisory for 2019-03-18
March 18, 2019 at 7:09

Another day of warm sunny conditions will increase the threat of wet avalanches. Large, dangerous wet loose slides occurred yesterday and will become more widespread today.  While the snowpack is generally stable this morning, the avalanche danger will rise with prolonged sunshine. Unsupportable, mushy snow or rollerballs are signs to move to shaded or lower angled slopes. Safer and higher quality snow can be found on shaded slopes.  

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-17
March 17, 2019 at 7:02

Spring-like temperatures and sunshine are increasing the danger of wet avalanches. While the snowpack is generally stable this morning, the avalanche danger will rise to MODERATE if the sun comes out for extended periods. Monitor the snow surface for signs of instabilities such as sticky, heavy snow or rollerballs. If you see these, avoid recreating on or below steep slopes, in gullies, and above terrain traps. Safer and higher quality snow can be found on shaded slopes. 

Whitefish Range
Click here to see the full advisory for 2019-03-17
March 17, 2019 at 7:02

Spring-like temperatures and sunshine are increasing the danger of wet avalanches. While the snowpack is generally stable this morning, the avalanche danger will rise to MODERATE if the sun comes out for extended periods. Monitor the snow surface for signs of instabilities such as sticky, heavy snow or rollerballs. If you see these, avoid recreating on or below steep slopes, in gullies, and above terrain traps. Safer and higher quality snow can be found on shaded slopes. 

Swan Range
Click here to see the full advisory for 2019-03-17
March 17, 2019 at 7:02

Spring-like temperatures and sunshine are increasing the danger of wet avalanches. While the snowpack is generally stable this morning, the avalanche danger will rise to MODERATE if the sun comes out for extended periods. Monitor the snow surface for signs of instabilities such as sticky, heavy snow or rollerballs. If you see these, avoid recreating on or below steep slopes, in gullies, and above terrain traps. Safer and higher quality snow can be found on shaded slopes. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-16
March 16, 2019 at 5:29

Steer clear of the exceptions to the generally stable conditions. In upper elevation terrain near the crests of the Flathead, Swan, and Whitefish Ranges or the peaks in Glacier National Park, the exceptions will be long-running sluffs of dry snow and pockets of wind slab. At lower elevations, the concern will be wet snow slides on steep slopes receiving direct sun. The danger posed by the latter will rise if cloud cover does not develop as forecast. 

Whitefish Range
Click here to see the full advisory for 2019-03-16
March 16, 2019 at 5:29

Steer clear of the exceptions to the generally stable conditions. In upper elevation terrain near the crests of the Flathead, Swan, and Whitefish Ranges or the peaks in Glacier National Park, the exceptions will be long-running sluffs of dry snow and pockets of wind slab. At lower elevations, the concern will be wet snow slides on steep slopes receiving direct sun. The danger posed by the latter will rise if cloud cover does not develop as forecast. 

Swan Range
Click here to see the full advisory for 2019-03-16
March 16, 2019 at 5:29

Steer clear of the exceptions to the generally stable conditions. In upper elevation terrain near the crests of the Flathead, Swan, and Whitefish Ranges or the peaks in Glacier National Park, the exceptions will be long-running sluffs of dry snow and pockets of wind slab. At lower elevations, the concern will be wet snow slides on steep slopes receiving direct sun. The danger posed by the latter will rise if cloud cover does not develop as forecast. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-15
March 15, 2019 at 5:39

Today you can trigger slides of loose, unconsolidated snow that can be dangerous on steep slopes above terrain traps. These sluffs can involve dry snow in shaded, colder terrain, and wet snow on slopes receiving sustained sun. Reduce your exposure to these hazards with judicious terrain choices: keep your partners in sight, let sluff run away from you, and stay out from under steep, rocky terrain when you see rollerballs or the snow is getting sticky. 

Whitefish Range
Click here to see the full advisory for 2019-03-15
March 15, 2019 at 5:39

Today you can trigger slides of loose, unconsolidated snow that can be dangerous on steep slopes above terrain traps. These sluffs can involve dry snow in shaded, colder terrain, and wet snow on slopes receiving sustained sun. Reduce your exposure to these hazards with judicious terrain choices: keep your partners in sight, let sluff run away from you, and stay out from under steep, rocky terrain when you see rollerballs or the snow is getting sticky. 

Swan Range
Click here to see the full advisory for 2019-03-15
March 15, 2019 at 5:39

Today you can trigger slides of loose, unconsolidated snow that can be dangerous on steep slopes above terrain traps. These sluffs can involve dry snow in shaded, colder terrain, and wet snow on slopes receiving sustained sun. Reduce your exposure to these hazards with judicious terrain choices: keep your partners in sight, let sluff run away from you, and stay out from under steep, rocky terrain when you see rollerballs or the snow is getting sticky. 

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-14
March 14, 2019 at 6:42

To avoid triggering loose wet avalanches today, trade steep, sunny aspects for shaded or lower-angled terrain. Watch for rollerballs and wet snow at the surface as signs that conditions are deteriorating.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-14
March 14, 2019 at 6:41

To avoid triggering loose wet avalanches today, trade steep, sunny aspects for shaded or lower-angled terrain. Watch for rollerballs and wet snow at the surface as signs that conditions are deteriorating. Where new snow is more cohesive, triggering wind slabs is still possible. Watch for denser snow, especially below ridgelines and near crossloaded features. Shooting cracks are a red flag.

Whitefish Range
Click here to see the full advisory for 2019-03-14
March 14, 2019 at 6:41

To avoid triggering loose wet avalanches today, trade steep, sunny aspects for shaded or lower-angled terrain. Watch for rollerballs and wet snow at the surface as signs that conditions are deteriorating. Where new snow is more cohesive, triggering wind slabs is still possible. Watch for denser snow, especially below ridgelines and near crossloaded features. Shooting cracks are a red flag.

Swan Range
Click here to see the full advisory for 2019-03-13
March 13, 2019 at 6:29

New slabs may bond poorly to the underlying snow. Use caution on slopes steeper than about 35 degrees. Track new snow totals and look for recently drifted snow. Slabs thicker than about 8” can be dangerous. Exercise caution below ridgelines and near crossloaded features. Choose simpler, sheltered terrain to avoid the problem.

Flathead Range and Glacier National Park
Click here to see the full advisory for 2019-03-13
March 13, 2019 at 6:24

New slabs, up to a foot or more thick, may bond poorly to the underlying snow. Use caution on slopes steeper than about 30 degrees. Track new snow totals and look for recently drifted snow. Slabs thicker than about 8” can be dangerous. Use extra caution below ridgelines and near crossloaded features. Choose simple, sheltered terrain to stay out of harm’s way.

Whitefish Range
Click here to see the full advisory for 2019-03-13
March 13, 2019 at 6:24

New slabs, up to a foot or more thick, may bond poorly to the underlying snow. Use caution on slopes steeper than about 30 degrees. Track new snow totals and look for recently drifted snow. Slabs thicker than about 8” can be dangerous. Use extra caution below ridgelines and near crossloaded features. Choose simple, sheltered terrain to stay out of harm’s way.

Swan Range

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