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Archived

Avalanche Forecast

Apr 24th, 2012–Apr 25th, 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
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high

Regions: Glacier.

The spring snowpack continues to weaken. Small inputs; an brief period of sun hitting a slope or an intense rain shower; are triggering large avalanches from all aspects running into fans. This will continue today, with sun and showers forecast.

Avalanche Problems

Loose Wet

Temperatures have remained above freezing in the alpine for the last 72hours, preventing an overnight freeze. The upper snowpack is isothermal and moist on solar aspects with little strength.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Wet Slabs

Moist snow and several crusts exist in the upper snowpack. Avalanche control Saturday produced size 2-3 wet slab avalanches, propagating on a crust down 40. Glide cracks continue to fail producing large avalanches running to valley bottom.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3