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Archived

Avalanche Forecast

Mar 9th, 2012–Mar 10th, 2012
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
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
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Banff Yoho Kootenay.

Expect rain tonight to 1250 m, 10-20 cm up high with the greater amounts West of the divide. With continued Strong SW wind tonight and tomorrow, slopes that have not yet run may be triggered by these additional inputs. Avoid avalanche terrain.LP

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Persistent Slabs

The Valentine surface hoar down up to 90 cm is overlain by a stiff slab and remains very sensitive to triggers. Skier remote size 2 on Narao ridge, near Louise, yesterday afternoon. This layer is still very touchy, stick to lower angle terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 2 - 4

Wind Slabs

Recent strong NW wind and strong SW wind over the last 24 hrs have developed slabs on all aspects. These are reported to be a more stubborn to trigger at Sunshine and Lake Louise. Tonight's snow may make them more sensitive or create new thin slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

The deep facets in the Rockies snowpack are awake again. These have mainly been observed on bigger features where the weight of the initial avalanche triggers the basal depth hoar, causing very large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4