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Archived

Avalanche Forecast

Mar 7th, 2012–Mar 8th, 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
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

Regions: Glacier.

Very tricky conditions exist. Large amounts of storm snow over several very weak layers are responsible for many large avalanches in the past 24 hours. This is a widespread cycle which is not yet over. Conservative route selection is advised.

Avalanche Problems

Storm Slabs

Since last Friday, over 1m of snow has fallen. Temps rose through the storm forming a cohesive "upside down" slab, with moist snow below 1500m. Temps dropped overnight, tightening this slab and forming a crust at lower elevations.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 2 - 3

Persistent Slabs

The Feb surface hoar layers are over 1.5m deep. Overloaded by the storm they produced very large avalanches. Avalanches are stepping down to these layers. Cornices have grown, and are becoming brittle, creating the potential for large triggers.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 4

Wind Slabs

High S winds are producing windslabs and deep drifts on open slopes at all elevations. Wind loading has rapidly increased the load on persistent weak layers, which will take time to adjust. The weight of a skier may be all they need to avalanche.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3