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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
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
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: Banff Yoho Kootenay.

Weather Forecast

The storm is over. Expect mixed sun and cloud with light snow accumulations through the end of the week. Temperatures will cool off slightly with freezing levels near valley bottom. Winds forecast to be light from the west.

Snowpack Summary

30 cm of storm snow at tree-line along the continental divide along with moderate to strong westerly winds has created wind-slabs in the alpine. Wind slabs are reactive to skier triggering on steep lee terrain. Easy shears at storm snow interface and mod shears down 60 cm on Nov 6 crust.

Avalanche Summary

Sunshine Ski Hill reported several class 1 avalanches ski cut within storm snow on steep rolls. During field trip to Bow Summit area no natural avalanches were observed although visibility was not great. Some whoomphing was heard at treeline.

Confidence

Avalanche Problems

Wind Slabs

30 cm HSt and westerly winds producing wind slabs on lee aspects down into treeline elevations. Wind slabs are touchy and are reactive to skier triggering.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Although no recent natural avalanches has been observed on this layer, this still is a significant interface to be aware of. Latest storm inputs may make this layer close to being overloaded. Easy to mod shears found on this layer at Bow Summit .

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3