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Archived

Avalanche Forecast

Dec 30th, 2011–Dec 31st, 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
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

Regions: Little Yoho.

Avalanche control planned for Mt. Bosworth, Stephen and Field tomorrow mid-day. Please no recreation of any sort on these peaks tomorrow. LP

Avalanche Problems

Wind Slabs

Since Dec 24, storm snow amounts total 40 cm (Lake Louise), 55 (Sunshine) , 60 (Bow Summit). SW winds have created touchy slabs 60-150 cm thick. Natural avalanches continue with on-going wind loading. Winds will taper and skies will clear tomorrow.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Large windslab releases continue to step down into the basal weak facets creating large avalanches. Size 3 Natural over Sacre Blue climb on Rundle today, photos on the mountain conditions report.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 3

Storm Slabs

The December 10 surface hoar is down approximately 60-70 cm. The distribution of this layer is spotty but mostly on the west side of the Divide (Mt. Whymper, Takakaw Falls). Avoid steep walled gully features, or steeper open slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2