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Archived

Avalanche Forecast

Nov 20th, 2012–Nov 21st, 2012
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Highly variable snow distribution across forecast area. Evaluate each slope carefully.

Weather Forecast

There are two distinct weather systems over our forecast area. To the north, cold temperatures (-16) and light flurries are expected for the next two days. South of the Columbia Icefield  a much milder air mass has produced 30+ cm of snow.

Snowpack Summary

There are a variety of layers in the snowpack that relate to the early season snow, rain and freeze-thaw cycles. These can be consistently found in field tests but the depth of the weaknesses and the type of shears vary from slope to slope.

Avalanche Summary

Several natural avalanches to size 2.5 were observed today. All the slide activity seems to be wind slabs on steep lee and cross loaded slopes in the alpine.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Avalanche Problems

Wind Slabs

Avoid freshly wind loaded features.Avoid lee and cross-loaded terrain near ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

Early season hazards such as rocks, trees and stumps are still visible.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2