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Archived

Avalanche Forecast

Mar 20th, 2012–Mar 21st, 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
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
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
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.

Winds at ridges expected to be SW 30-50 today with temps around -6 and FL rising to 1000m. Expect mostly clouds today with light to mod precip. Watch for breaks in the could this morning. Glide cracks are becoming a concern again at TL and BLT

Avalanche Problems

Wind Slabs

Southerly winds continue to form slabs at ridgecrests. These may be buried with little evidence at the surface. Wind transport has loaded slopes and cornices are growing.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Cornices

Most ridges throughout the Park have massive cornices. Fluctuating temperatures and continued wind transport increase the potential for cornice failure. These failures are the big triggers capable of stepping down to the Feb. persistent layers.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 4

Deep Persistent Slabs

The Feb 9 surface hoar, sun crust, facet layer is now down 1.5-2 m. Potential for large unsurvivable avalanches still exists from failure on this layer. Unpredictable cornice failure is the most likely trigger on this layer.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 3 - 4