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Archived

Avalanche Forecast

Mar 11th, 2012–Mar 12th, 2012
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Another storm has resulted in a widespread avalanche cycle with avalanches to size 4 from all aspects running across valleys. Forecast inputs (10-20 cm snow, south winds, and afternoon sun) may trigger natural avalanches running full path. DM

Avalanche Problems

Storm Slabs

Up to 60 cm of snow has fallen in the past 48 hrs. Temps rose to just above freezing at treeline with moist snow to 1600m. This cohesive slab overlies a layer that is reactive and may step down to deeper layers resulting in very large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3

Persistent Slabs

Up to 60 cm of snow has overloaded the Feb surface hoar layers, which continue to produce impressively large avalanches. These layers are down 1.5-2 m. They may be triggered by skiers, loading by wind or cornice fall, or stepping down (problem 2).

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 3 - 4

Wind Slabs

Southerly winds during the storm transported snow, loading slopes, triggering avalanches and forming windslabs on exposed slopes at treeline and above. These windslabs overlie lower density snow and may be triggered by skiers.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 3