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Archived

Avalanche Forecast

Dec 7th, 2014–Dec 8th, 2014
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Weather Forecast

Lull between storms today with light flurries and cooler temperatures with more clearing  tomorrow. A significant pacific frontal system will approach the interior tomorrow night bringing moderate to heavy precipitation with rising freezing levels and associated strong southwest winds into Tuesday and Wednesday.

Snowpack Summary

15-20cm of recent storm snow is over the Dec 5 surface hoar/facet layer and sun crust on steep solar aspects. This new snow sits over a breakable crust below 1600m. The Nov 21 and Nov 9 persistent weak layers are buried down ~100 and ~130cm. Snowpack tests indicate triggering the Nov 21 layer as less likely but fracture character is sudden planar.

Avalanche Summary

No new avalanches were observed yesterday.

Confidence

Due to the quality of field observations

Avalanche Problems

Storm Slabs

Recent storm snow may be sitting on good sliding surfaces such as surface hoar and crust. The winds picked up overnight so watch out for areas that may be wind loaded.
Avoid freshly wind loaded features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Trigger points for the persistent weak layers buried down ~1m and ~1.3m include steep alpine terrain, thin areas, and unsupported open slopes.
Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3