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Archived

Avalanche Forecast

Nov 30th, 2014–Dec 1st, 2014
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Watch your exposure to the cold temperatures today, be careful not to get frostbite.

Weather Forecast

High pressure ridge over the interior maintaining cold and clear conditions. Trough will bring will bring light flurries and cloud to the region later tomorrow after which the ridge will rebuild until Thursday.

Snowpack Summary

120cm of storm snow has fallen over The Nov 21 surface hoar/sun crust layer now down ~ 90 and Nov 9 rain crust down ~110cm.  Whoomphing and cracking are still being observed by backcountry users at around tree line. The Nov 28 rain crust is present to ~1500m.

Avalanche Summary

2 natural avalanches yesterday morning within the highway corridor east of the Rogers Pass summit size 2.0 and size 3.0.  In the backcountry,  There were large avalanches in the Asulkan Valley from 2 days ago off of the Ravens and Mt Jupiter filling the Mouse Trap.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

2 persistent weak layers are present down ~1m to ~1.3m. Whoomphs were reported yesterday by a party just above the Asulkan Hut. Heavily traveled areas do not give these indications as they have been previously settled. 
Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Storm Slabs

The recent storm snow is settling but instabilities are more likely to persist with these very cold temperatures.
Avoid freshly wind loaded features.If triggered the storm slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3