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Archived

Avalanche Forecast

Feb 4th, 2012–Feb 5th, 2012
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.

Loose avalanches followed the sun yesterday, and are expected again today. This is a localized and predictable problem, specific to solar aspects. Pay attention to areas affected by the sun: the slope or cornice above you might be getting cooked.

Avalanche Problems

Cornices

Cornices are large, will become weaker due to solar warming and fail. Slopes with cornices looming above should be avoided. Cornices provide large triggers capable of triggering deeper layers. They are easily triggered when traveling along ridges.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 4

Loose Dry

Yesterday, as the sun worked it's way around aspects loose avalanches were triggered and running far. Expect loose avalanches on solar aspects, most likely triggered on steep slopes with rocky outcrops. Avoid exposure to slopes that are in the sun.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Wind Slabs

Significant wind loading onto lee slopes last week created hard and soft wind slabs. These are most touchy in start zones, and have potential to propagate widely.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3