Avalanche Forecast
Avalanche Bulletin - Glacier National Park
The persistent weak layers in the snowpack remain susceptible to human triggering.
Avalanche Problem 1: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.
- Use conservative route selection, choose moderate angled and supported terrain with low consequence.
Avalanche Summary
Seven new natural avalanches to size 2.5 recorded in the highway corridor yesterday off of steep south facing terrain. No new slides observed or recorded in the back country yesterday.
Snowpack Summary
70cm of storm snow has settled into a slab over a series of persistent weak layers. The Jan 4th & Dec 15 surface hoar layers are down around 60cm and 90cm. The combination of load and a temperature inversion made these layers reactive over the last several days. These layers remain reactive with sudden planar results and potential for propagation.
Weather Forecast
Mainly cloudy with scattered flurries and around 4cm of snow today. A pending storm system will bring snowfall with upwards of 30cm expected by Friday afternoon. The avalanche danger will increase with this new snow load on the persistent weak layers.
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The Jan 4 and Dec 15 surface hoar layers are down ~60cm and ~90cm respectively. These layers are widespread at treeline. A receding weak temp inversion and mainly cloudy conditions should reduce reactivity compared to recent days.