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Archived

Avalanche Forecast

Feb 7th, 2013–Feb 8th, 2013
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
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.

Wind slabs in the alpine remain the dominant concern.  Cornices have grown large in recent days, and may be the prime trigger for slab avalanches.

Weather Forecast

A frontal system moving across the interior today will produce light precipitation, while winds ease off.  Up to 5cm could accumulate over higher areas.  Skies will be mostly overcast with some sunny breaks.  A ridge will move in on Friday, bringing drier conditions and a bit more sun.

Snowpack Summary

Soft and hard slabs have formed in the alpine and treeline, mostly on lee aspects (N and E), from wind transported storm snow.  On solar aspects, these slabs overly a sun crust (formed on Feb. 3rd) and overlies firm old snow elsewhere.  The mid-pack is generally strong, but has become weaker in shallow areas and around trees and rocks.

Avalanche Summary

Avalanche control operations in the park yesterday produced 30+ avalanches on all aspects.  Most of these involved surface soft slabs, running to end path or  the top of the fans.  Two larger avalanches ran to the highway.  There were no recent reports of avalanches in the back country, and permit areas were closed yesterday for control work. 

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Winds tapered off overnight, but the slabs that formed previously remain a concern.  Expect pockets of slab in lee features and near ridge crests.  Slabs will be thicker on lee aspects, but persist on solar (S + W) aspects over the Feb. 3 sun crust.
Be cautious as you transition into wind affected terrain.Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3