Avalanche Forecast
Dec 8th, 2011–Dec 9th, 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
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
Regions: Glacier.
Watch for rising freezing levels on Friday and Saturday. A rapid rise in temperature may be what it takes to cause avalanche danger to increase in the alpine.
Avalanche Problems
Wind Slabs
There are widespread windslabs at treeline and above. Strong winds have transported snow resulting in variable snowdepths in the alpine. Some slopes will be loaded while others will be thin. Thin areas will be weaker, see problem 2.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood: Unlikely - Possible
Expected Size: 1 - 2
Deep Persistent Slabs
A persistent weak layer at the bottom of the snowpack has caused very large avalanches. They have had wide propagations, failed 2m deep and ran to valley bottom. 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