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Archived

Avalanche Forecast

Dec 1st, 2021–Dec 2nd, 2021
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Kananaskis.

The storm continues into Thursday with 25cm of snow and strong winds. A natural avalanche cycle is on-going. Avoid all avalanche terrain.

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.

Avalanche 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: Very Likely

Expected Size: 1.5 - 3

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: Likely

Expected Size: 2.5 - 3.5