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Archived

Avalanche Forecast

Dec 19th, 2011–Dec 20th, 2011
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
4: High
The avalanche danger rating at treeline will be high
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
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Strong to extreme winds coupled with warm temperatures are creating hard, easily-triggered windslabs in most treeline lee features as well as pockets of the alpine that are sheltered enough to hold snow.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Wind effect is extremely variable

Avalanche Problems

Wind Slabs

Windslabs have formed in sheltered lee features at Treeline and protected pockets in the Alpine.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Basal facet collapses are still being noted in test pits below midpack bridging layers. Shallow snowpack areas and rocky outcrops are likely trigger locations.

Aspects: North, North East, East, South East, South, South West.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3

Storm Slabs

Anywhere from 5-35cm of new snow fell Saturday evening. Warm temperatures and winds have stiffened the storm snow into a more cohesive soft slab layer. Some pockets of soft slab may release from skier presence.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2