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Archived

Avalanche Forecast

Dec 24th, 2011–Dec 25th, 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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Continuous weather systems are forecast to bring snow and strong S wind to the forecast area this weekend. Fidelity conditions: 12 cm new snow, HS is 210 cm.

Avalanche Problems

Wind Slabs

Wind slabs can be expected at ridge tops after lgt to mod snowfall and strong S wind overnight. This condition will intensify with high wind and snow forecast over the next two days.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Persistent Slabs

A layer of surface hoar buried on Dec. 11 is overlaid by 60cm of storm snow. This persistent weak layer has caused several recent skier involvements. It may still be touchy in areas that have not yet avalanched. RB6 on this layer in alpine.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3

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: All elevations.

Likelihood: Unlikely

Expected Size: 3 - 4