Avalanche Forecast
Issued: Dec 1st, 2021 3:00PM
The alpine rating is Wind Slabs and Deep Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeThe storm continues into Thursday with 25cm of snow and strong winds. A natural avalanche cycle is on-going. Avoid all avalanche terrain.
Summary
Confidence
Moderate -
Weather Forecast
Another 25cm of snow is expected by Thursday afternoon. With freezing levels dropping, this snow should get progressively drier. Winds remain in the strong to extreme range from the West. Friday looks like a dry and much colder day with light winds.
Avalanche Summary
Observations were extremely limited today due to severe weather, but it is expected a natural avalanche cycle is on-going.
Snowpack Summary
No field observations today as the highway was not drivable (sheer ice in many places). Weather stations at 2200m indicate 30mm of rain from Wednesday morning to afternoon, with only 10cm of snow. The freezing level was likely higher than this, so forecasters expect heavy wet snow extending up into the Alpine. With the continued snowfall, dropping temps and strong winds through Wednesday night and Thursday, it is expected that Alpine areas will have a fresh round of sensitive wind slabs. Conditions through the treeline elevation band will be highly variable and probably involve some sort of newly formed buried crust once temperatures finally drop. Expect rain runnels at lower elevations.
Terrain and Travel
- Avoid all avalanche terrain during periods of strong wind.
- Avoid slopes that sound hollow or drum-like.
- Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
Problems
Wind Slabs
Fresh wind slabs continue to build in the alpine. Natural avalanche activity related to this problem is on-going.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
Nov 15th rain crust currently is not producing any results. Something to watch as this new load tests out the whole snowpack
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 2nd, 2021 3:00PM