Avalanche Forecast
Avalanche Bulletin - Glacier National Park
Conservative terrain choices are still required given current conditions.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Watch for whumpfing, hollow sounds, and shooting cracks.
- Use conservative route selection, choose moderate angled and supported terrain with low consequence.
Avalanche Problem 2: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
10cm of storm snow accompanied by mod-strong S'ly winds have formed fresh storm slab at and above treeline. These slabs reside on a variety of surfaces such as small surface hoar, temperature crust and sun crust.
Travel and Terrain Advice
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
- Be wary of slopes that did not previously avalanche.
Avalanche Summary
Limited natural avalanche activity through the highway corridor and no new slides reported or observed in the back country yesterday.
Snowpack Summary
10cm storm snow overnight with mod-strong S'ly winds have formed new thin storm slab on alpine and treeline lee features. This adds load to the previous storm slab over persistent weak layer condition that formed over the last 10 days. The Jan 4th, Dec 15 surface hoar layers are down ~60cm and ~90cm. Both layers are producing sudden planar results.
Weather Forecast
Cloudy with sunny periods and a trace of snow and an alpine high of -2C today. Tonight through Thursday the forecast calls for upwards of 30cm of storm snow with gusty moderate to strong SW winds and alpine temperatures of -3C.
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The Jan 4 and Dec 15 surface hoar layers are down ~65cm and ~95cm respectively. These layers are widespread at treeline. 10cm storm snow in the last 24hrs will add load to the slab over these weak layers.