Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Its cold out there, bring the extra puffy jacket! Recent strong N-E winds have reverse loaded terrain at and above treeline, expect widespread wind effect.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Recent N-NE wind loading have created widespread wind slabs.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Persistent weak layers continue to linger and may be susceptible to human triggering in shallow areas. Larger triggers such as cornice fall may also wake these deeper weak layers resulting in larger avalanches.
Travel and Terrain Advice
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
- Avoid steep convexities or areas with a thin or variable snowpack.
Avalanche Summary
A dozen avalanches mostly in the size 2 range observed yesterday in the highway corridor. Two natural cornice triggered slides observed in Grizzly bowl this morning off of solar terrain. MIN report of a size 2 slab avalanche occurring in the alpine yesterday morning off a NE aspect of the Asulkan Glacier below Sapphire Col.
Snowpack Summary
Strong NE winds have formed reverse loaded cornices that have been failing and triggering size 2 avalanches. Widespread windslab can be expected in the alpine and exposed areas well into treeline. On solar aspects, a well developed crust is buried 40cm. Persistent weak layers from January and December are now buried 150-200cm.
Weather Forecast
Sunny with cloudy periods, N winds to 20km/h and alpine highs of -18C. Cloudy with sunny periods into mid week with continued cold temperatures and winds shifting from northerly to westerly by Wednesday.
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20 hrs of strong N-NE winds have formed reverse loaded windslab at and above treeline. Natural slab avalanches to size 2 have been randomly occurring many triggered by cornice fall. Avoid exposing yourself to overhead hazard.