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Archived

Avalanche Forecast

Jan 7th, 2012–Jan 8th, 2012
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Moist and mild weather is forecast to affect this area beginning tonight through Sunday. Moderate to heavy snowfall amounts are possible. Avalanche hazard will significantly rise on Sunday if the intensity of this weather system materializes.

Avalanche Problems

Storm Slabs

30 cm of storm snow overlies rain crust. This storm slab has gained strength but large triggers have indicated that this still presents an avalanche problem.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 4

Persistent Slabs

The Dec. 11 SH layer continues to produce sudden planar test results. Large triggers such as cornice failures and avalanches are stepping down to this weakness. Natural and artillery fired avalanches on Jan 5th produced this step down effect.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4

Wind Slabs

Strong south winds from the most recent storm transported snow producing soft slabs over the Jan 3 rain crust or the storm slabs formed earlier last week. The crust carries into the lower alpine in some locations. Watch the immediate lee of ridges.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3