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Archived

Avalanche Forecast

Mar 21st, 2012–Mar 22nd, 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
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.

Today's weather forecast is calling for sunny breaks, so watch for rising temperatures and avalanches resulting from solar radiation.

Avalanche Problems

Wind Slabs

New wind slabs and loaded pillows have been forming from strong S winds. Natural avalanches on steep N asp running well onto fans have been observed again this morning. Slabs formed at ridge lines and cross loaded features.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

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: All aspects.

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. Skiers are unlikely to fail this layer, but consequences are high if this layer does fail. Unpredictable cornice failure is the most likely trigger on this layer.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 4