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Archived

Avalanche Forecast

Dec 28th, 2011–Dec 29th, 2011
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

The storm is forecasted to intensify tonight with continuing moderate to strong winds. Natural activity in the alpine is expected to be more widespread.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Forecast snowfall amounts are uncertain on Thursday

Avalanche Problems

Wind Slabs

In most areas, storm snow amounts are now about 30 to 40 cm. SW winds have created soft slabs up to 50 cm deep. These are touchy and are running long distances.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

Although there has been little recent avalanche activity on this layer, it could become active with the current additional loading. On a larger feature, a windslab release has the potential to step down into these facets.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3

Storm Slabs

Distribution of the December 10 buried surface hoar layer is spotty but mostly on the west side of the Divide. Isolated soft slabs on this layer were triggered as early as yesterday in the Yoho Valley at tree-line.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2