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Archived

Avalanche Forecast

Jan 22nd, 2012–Jan 23rd, 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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Glacier.

Numerous natural avalanches to size 3.5 occurred yesterday. Expect things to be touchy today as the snowpack adjusts. Fidelity weather: 24hr snowfall 21cm, Storm snow (since the 18th) 52cm, Height of snow 318cm. Winds on Macdonald West Shoulder S 45

Avalanche Problems

Storm Slabs

50 cm of low density snow, under the influence of moderating temperatures and increasing wind is forming a cohesive storm slab. It overlies small facets on soft slabs. Numerous avalanches and snowpack tests indicate this interface is very touchy.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 4

Wind Slabs

Overnight winds increased. They have been consistently from the SW and in the transporting range. With 50 cm of new light snow available for transport, expect windloading and softslabs on exposed terrain.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Loose Dry

Where unaffected by wind, 50 cm of low density snow will sluff easily. Described as "power sluffing" these loose avalanches move very quickly and pick up mass as they travel. They should not be underestimated.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2