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Archived

Avalanche Forecast

Mar 8th, 2012–Mar 9th, 2012
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
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

Regions: Banff Yoho Kootenay.

Strong to extreme W. winds, freezing levels to 2000m and up to 10cm of snow (drizzle at lower elevations) will keep the hazard elevated on Friday. A few large natural avalanches were observed today, and it still feels spooky out there. SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Forecast snowfall amounts are uncertain on Friday

Avalanche Problems

Persistent Slabs

The Valentine surface hoar down up to 90cm is overlain by a stiff slab and remains very sensitive to triggers. Natural activity has slowed somewhat,but a few solar releases (Urs Hole) to size 3 were seen. Some slopes have reloaded over the last day.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 2 - 4

Wind Slabs

Strong NW winds over the last 24-hours have created windslab conditions in open areas at higher elevations. These have been reported to be fairly stubborn to trigger today at Sunshine Village,

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

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