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Archived

Avalanche Forecast

Dec 26th, 2011–Dec 27th, 2011
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
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

Regions: Glacier.

Light precip today with Mod amounts forecast for tonight, Wed and Thurs. Natural and skier triggered avalanches failing in the storm snow and on the Dec. 24 surface hoar are likely to certain as the load increases. Step down to Dec 11 SH potential!

Avalanche Problems

Wind Slabs

Mod to Strong Southerly winds combined with a period of intense snowfall overnight produced wind slabs below ridge crests, at terrain features and on cross loaded slopes. Slabs formed over a new layer of surface hoar at elevations up to 2300m.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Persistent Slabs

The surface hoar buried Dec 11 is a persistent weak layer that presents a concern as the load increases over the week. Avalanches failing on the surface hoar buried Dec 24th could step down to this layer resulting in very large avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4

Deep Persistent Slabs

A weak basal crust is present in the alpine and was responsible for large avalanches. The deep layers are generally unreactive but may be triggered from thin snowpack areas. Glide cracks are forming at all elevations. One failed at 1100m Dec 22.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely

Expected Size: 3 - 4