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Archived

Avalanche Forecast

Jan 11th, 2012–Jan 12th, 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
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
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.

A high pressure ridge will block winds and precipitation until Friday evening. Sunny skies and a slight temperature inversion today with will make alpine slopes more inviting. Watch for failure of recently formed cornices and solar releases.

Avalanche Problems

Wind Slabs

Strong south winds earlier in the week formed thin slabs over the storm snow and hard slabs formed earlier. The problem is generally found to the lee of alpine ridges and on cross loaded features at upper elevations. Wide propagation is possible.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Storm Slabs

50 cm of snow overlies a weakness in the storm snow which shows signs of strengthening. Tests continue to produce Mod - Hard results on this weakness. Avalanches in this layer could trigger the surface hoar layers buried in December.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Persistent Slabs

The Dec. 11 SH layer continues to produce avalanches when heavily loaded. Cornice failure is a current concern. A recent fracture line profile at 1600m showed this slab failing 110 cm deep during the last storm on Jan 6. Step down failures possible.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4