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Archived

Avalanche Forecast

Jan 6th, 2012–Jan 7th, 2012
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
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

Regions: Glacier.

The next 3 days should produce some clear skies, little precipitation, moderate NW winds and cooler temperatures. The snowpack is adjusting to a major warm storm. This is not the time for big lines and steep terrain. Fidelity: HN24 12cm -0.5/-5.5.

Avalanche Problems

Storm Slabs

A rain crust that formed on Jan 3 is buried by 30cm of storm snow. Strong South winds (40-100kph) continued overnight. The storm slab over the crust, has been very reactive to skiers and produced large natural avalanches to valley bottom yesterday.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

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 - Likely

Expected Size: 2 - 4

Wind Slabs

Strong southerly winds have been observed transporting snow and producing soft slabs over the Jan 3 rain crust or the storm slabs formed earlier this 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