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Archived

Avalanche Forecast

Dec 18th, 2011–Dec 19th, 2011
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
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.

15-30cm fell Sunday, which is making conditions touchy at higher elevations. Skiers had a close call today, causing a size 2.5 avalanche in the Lake Louise backcountry today on basal facets. Click the Facebook link below to see pictures.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Wind speed and direction is uncertain on Monday

Avalanche Problems

Wind Slabs

Many soft wind slabs 15-30cm will be developing in lee areas that will be touchy to human triggering with increased forecast alpine winds on Monday afternoon.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Deep Persistent Slabs

The new snow load is adding stress to the snowpack that sits over basal depth hoar and facets. This will be easiest to trigger from thin areas. The Lake Louise avalanche slid on this layer to ground.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Loose Dry

Lots of loose snow at all elevations that will spindrift heavily with any wind input, especially in gullies and climbing terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2