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Archived

Avalanche Forecast

Mar 5th, 2012–Mar 6th, 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
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.

A large avalanche cycle is ongoing. This morning several size 3.5 avalanches have run full path stopping at the end of the fans. The storm will continue today, as will the avalanche activity. Avoid all avalanche terrain.

Avalanche Problems

Storm Slabs

Heavy snow, mild temps and strong winds formed a cohesive "upside down" slab this weekend. Skiers report easily triggering an instability within this slab, with propagations up to 100m wide. The slab has also been triggered by avalanches from above.

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, is making 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