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Archived

Avalanche Forecast

Apr 20th, 2012–Apr 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
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
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.

The front has passed and clearing is forecast today. Strong solar is forecast for this afternoon and Saturday. Freezing levels will rise to 1800m today, 2200m Saturday and as high as 3000m on Sunday. Glide cracks are failing daily.

Avalanche Problems

Loose Wet

A system overnight has dropped an additional 20cm of moist snow at tree line. Sun in the afternoon will loosen the new snow. Sluffs from rocks and trees are indicators that surface snow is ready to move. Small avalanches can build mass rapidly.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Wind Slabs

Strong and gusty south winds early this morning have produced a small avalanche cycle on steep N-NE aspects. Wind slabs and loaded pockets will have formed at and below ridge lines and near terrain features at tree line

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wet Slabs

The top meter of snow is moist. The snowpack is isothermal to the ground up to 2100m with a series of crusts in the top 90 cm. The crusts provide potential failure planes and good bed surfaces for moist avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3