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.
Date the advisory was published: |
Forecast Region | |
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Click here to see the full advisory for 2021-01-16 |
January 16, 2021 at 5:34 On steep slopes where the snow surface isn't a thick, hard crust, you can still trigger slides that break 1 to 3 feet deep on weak layers buried by this week's storm. Reduce your risk of triggering a slide by sticking to slopes less than 35 degrees that have runouts free of obstacles. The hard, slick rain crust makes for difficult travel and slide-for-life conditions on other steep slopes. |
Swan Range |
Click here to see the full advisory for 2021-01-17 |
January 17, 2021 at 6:50 Due to an overproducing storm, we have reissued the Swan forecast. Anticipate thin slabs forming throughout the day. These will be thicker and more widespread as you gain elevation, especially on leeward slopes. You can still trigger a weak layer buried 1-3 feet below the surface in areas not capped by a thick crust. In these areas, choose lower-angled, planar terrain. Finish your weekend off in style by steering around slopes harboring dense snow that cracks around you. |
Swan Range |
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Click here to see the full advisory for 2021-01-17 |
January 17, 2021 at 6:58 Today's fresh snow is a beautiful sight, but don't forget about what is hidden under the surface. You can still trigger a weak layer buried 1-3 feet below the surface in areas not capped by a thick crust. Anticipate sluffing in the new snow, especially as you gain elevation. Finish your weekend off in style by choosing lower angle planar terrain in areas without a surface crust. Opt for slopes with good runouts free of terrain traps and surface obstacles. |
Flathead Range and Glacier National Park |
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Click here to see the full advisory for 2021-01-17 |
January 17, 2021 at 9:30 Due to an overproducing storm, we are reissuing the Whitefish forecast. You can still trigger a weak layer buried 1-3 feet below the surface in areas not capped by a thick crust. In these areas, choose lower-angled, planar terrain. Anticipate thin slabs forming throughout the day. These will be thicker and more widespread as you gain elevation, especially on leeward slopes. Finish your weekend off in style by steering around slopes harboring dense snow that cracks around you. |
Whitefish Range |
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Click here to see the full advisory for 2021-01-18 |
January 18, 2021 at 6:07 Triggering a slide in yesterday's storm snow remains our main concern. Avalanches have the potential to run long distances on top of a crust. In areas without a stout near-surface crust, you can impact a buried weak layer 1-3' below the surface, resulting in a larger slide. On steep slopes, steer around areas harboring dense snow that doesn't bond to the underlying crust. When in doubt, default to lower angle terrain free of rollovers. |
Swan Range |
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Click here to see the full advisory for 2021-01-18 |
January 18, 2021 at 6:55 In areas without a stout near-surface crust, you can impact a buried weak layer 1-3' below the surface, resulting in a larger slide. That hazard is relatively widespread at upper-elevations and isolated at mid-elevations. When in doubt, default to planar slopes less than 35 degrees with runouts free of surface obstacles and terrain traps. |
Flathead Range and Glacier National Park |
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Click here to see the full advisory for 2021-01-18 |
January 18, 2021 at 6:55 In areas without a stout near-surface crust, you can impact a buried weak layer 1-3' below the surface, resulting in a larger slide. That hazard is relatively widespread at upper-elevations and isolated at mid-elevations. When in doubt, default to planar slopes less than 35 degrees with runouts free of surface obstacles and terrain traps. |
Whitefish Range |
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