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Archived

Avalanche Forecast

Dec 7th, 2011–Dec 8th, 2011
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

The snowpack is settling rapidly, now 191 cm at Fidelity. Freezing levels are forecast to rise to ridgetop on Friday. Avalanche danger will also rise. A widespread and destructive avalanche cycle on Nov 27th was associated with warm temperatures.

Avalanche Problems

Loose Dry

Recent natural avalanches have been loose from steep rocky terrain in the alpine. Approximately 35cm of low density storm snow runs quickly on the well settled snowpack below. Skiers sluffs are fast moving and pick up mass.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wind Slabs

Variable winds have transported snow forming soft slabs on open slopes. These variable winds have also resulted in variable snowdepths in the alpine. Some slopes will be loaded while others will be thin. Thin areas will be weaker, see problem 3.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Very large avalanches have failed on a persistent weak layer near the ground. Avalanche control and a skier accidental last week produced avalanches up to 2m deep. This layer may be easily triggered from thin snowpack areas, or by a large trigger.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 4