Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Human triggered avalanches are still likely.
Avalanche Problem 1: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.
- Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Deeply buried persistent weak layers were reactive in the recent avalanche cycle. Larger loads such as storm slab or cornice fall may trigger these layers. Resulting avalanches will have the potential to reach the full extent of their run-out zones.
Travel and Terrain Advice
- Be aware of the potential for wide propagations.
- Use conservative route selection, choose moderate angled and supported terrain with low consequence.
Avalanche Summary
Numerous natural and artillery controlled avalanches to sz 4.0 occurred during Thursday's storm. Several ran full extent, taking out mature trees. Friday avalanche control just west of the park produced more large destructive size 4 avalanches. While natural activity has tapered off, human triggered avalanches are likely given the right location.
Snowpack Summary
Approximately 60cm of snow from the past storm has settled into a widespread storm slab. Strong winds in the alpine have created variable wind slab in the alpine and in exposed areas at treeline. Dec and Jan persistent weak layers are now buried 150-200cm in the snowpack. Height of snow is 350cm at treeline.
Weather Forecast
Sunny with cloudy periods today along with light ridge winds and alpine temperatures a chilly -17C. Monday expect cloudy with sunny periods and no precipitation. Tuesday a pulse of moisture is forecast to bring us ~10cm of snow and a little warmer temperatures.
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The last storm brought 60cm+ of snow. In the alpine, strong winds have formed windslab. If triggered these slabs have potential to propagate. Cornices have grown in size & become more fragile in the last week, avoid exposing yourself to this hazard.