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Archived

Avalanche Forecast

Jan 30th, 2012–Jan 31st, 2012
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
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.

Many size 2.5 to 3.5 natural and artillery controlled avalanches occurred yesterday, from all aspects. Many avalanches propagated wider at lower elevations triggering slabs. Artillery also triggered avalanches in adjacent paths showing propagation.

Avalanche Problems

Storm Slabs

Over the past 36hours up to 60cm of dense snow was deposited on top of 10cm of weaker low density snow from the 28th. The dense snow is forming a cohesive slab which will be most reactive on steep slopes and convex features.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 4

Wind Slabs

Moderate to strong S-SW winds have prevailed during recent storms resulting in a series windslabs on exposed terrain. New windslabs are forming, and old ones have been buried. Major drifting and crossloading has been observed.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Cornices

A series of storms have provided lots of snow for transport by sustained southerly winds. Cornices are getting very large, and when they fail will provide large triggers capable of triggering deep layers and large avalanches.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 3 - 4