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Archived

Avalanche Forecast

Mar 4th, 2012–Mar 5th, 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
4: High
The avalanche danger rating below treeline will be high
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
4: High
The avalanche danger rating below treeline will be high
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.

Mild temps, 10-15cm snow and westerly winds in the transporting range forecast today. Yesterdays storm overloaded the snowpack, with natural avalanches running full path and touchy instabilities triggerable by skiers. This will continue today.

Avalanche Problems

Storm Slabs

60cm of snow has fallen in 48hrs with rising temps. This has created a cohesive "upside down" slab. Skiers yesterday were easily triggering an instability within this slab, with propagations up to 100m wide.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 2 - 3

Persistent Slabs

Buried surface hoar layers down over a meter continue to be reactive. Rapid loading with new snow amplified by windloading will make these layers more reactive. They may be triggered naturally with the new load, by skiers, or cornice fall.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 4

Wind Slabs

New snow is being transported by strong S winds, producing windslabs and deep drifts on open slopes at all elevations. Windloading will significantly increase the load on persistent weak layers. In fatter areas, they may be more easily triggered.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3