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Archived

Avalanche Forecast

Mar 10th, 2012–Mar 11th, 2012
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
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: Northwest Coastal.

Confidence

Fair - Intensity of incoming weather is uncertain on Sunday

Weather Forecast

Sunday: light snowfall - light southerly winds - freezing level at 400m Monday: trace amounts of snow with some clearing- light southeast winds - freezing level at 400m Tuesday: very light snowfall - light southwest winds - freezing level at 200m

Avalanche Summary

A size 1.5 natural wind slab avalanche was reported on Friday on a cross-loaded slope at treeline. Storm snow avalanches up to size 3.5 were reported from the big terrain around Bear Pass. A few natural size 2 slab releases on the early February persistent weak layer interface were reported on Thursday. They occurred below treeline on steep, unsupported terrain.

Snowpack Summary

Continued strong westerly winds have created widespread reactive wind slabs on lee aspects. A persistent weak layer of surface hoar buried at the beginning of March is as much as 70cm deep and has started to become reactive in some areas. The early February persistent weak layers (surface hoar, facets, crusts) are buried as much as 110cm down and also remain a concern in some parts of the region. Although not widespread throughout the region, persistent slabs would be destructive in nature and may be reactive to human triggers, particularly below treeline on isolated and sheltered steep terrain where buried surface hoar may be preserved. Cornices in the region are reported to be large and unstable.

Avalanche Problems

Wind Slabs

Recent strong winds have deposited large and reactive wind slabs in unusual places, but generally lurking below ridgecrests, behind terrain features and in gullies.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 6

Persistent Slabs

Persistent weaknesses, where they exist, may be susceptible to rider triggers. Any avalanches failing on these layers are expected to be large and destructive.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 6