Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Fresh storm snow is forming soft storm slabs at and above teeline. Recently formed windslab will now be hidden by storm snow.
Avalanche Problem 1: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Minimize overhead exposure during periods of heavy loading from new snow, wind.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
Avalanche Problem 2: Loose Dry
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Storm snow is landing on a facetted old snow surface. In steeper terrain expect surface sluffing, which can be an issue in terrain traps such as gully features.
Travel and Terrain Advice
- If triggered dry loose point releases can form deeper deposits in terrain traps.
Avalanche Summary
No new avalanche observations from the past 48 hours in the highway corridor. Field team was able to release loose dry 0.5 size avalanches off of steep unsupported convexities at treeline yesterday. The slides moved slowly and did not run far.
Snowpack Summary
20cm of storm snow with mod S winds forming soft slabs along lee of ridges. Storm snow landing on a facetted old snow surface making for a weak bond. Previous strong N'ly and recent mod S'ly winds have added to cornice growth. Old windslab can be expected in the alpine. On solar aspects, a crust is buried 40cm. PWL from Jan now buried 150-200cm
Weather Forecast
20cm of storm snow in the last 24hrs at 1900m with another 10cm expected this morning. Ridge winds will be moderate gusting to strong from the west. Cloudy with clear periods this afternoon into Monday with moderate southwest winds at ridge line.
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Moderate S'ly winds and 20cm of storm snow all landing on a facetted old snow surface should make for reactive storm slab at and above treeline. Lingering windslab is also a concern and will be hidden under the new snow.