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Avalanche Forecast

Dec 16th, 2012–Dec 17th, 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
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

Regions: South Columbia.

Avalanche danger could be increased in southern parts of the region. Use extra caution if it is snowing or blowing heavily.

Confidence

Fair - Track of incoming weather is uncertain

Weather Forecast

Monday: Strong winds changing from S to NW. Alpine temp -7. 10-20 cm snow. Snowfall will be more intense in the south than in the north of the region. Tuesday: Moderate NW winds. Alpine temp -12. No snow. Wednesday: Light SE winds. Alpine temp -14. Light snow.

Avalanche Summary

Recent reports include numerous natural and skier triggered soft slab and loose snow avalanches up to size 1.5. On Friday, a size 2.5 avalanche failed on a steep northerly aspect in the alpine, possibly failing on a persistent weakness.

Snowpack Summary

Up to 50 cm of low density new snow has formed wind slabs in exposed lee and cross-loaded terrain in the alpine and at treeline. In areas sheltered from the wind, the new snow is sluffing fast and far. Older wind slabs are also buried on northerly aspects in the alpine. Overall, the upper snowpack is reported to be settling well. The late November surface hoar, down 100-140 cm (between 1500 and 2000 m), is producing moderate to no results in snowpack tests, with isolated sudden results. The early November crust, down 150-230 cm, has produced occasional sudden results in snowpack tests. Professionals are still cautious about these lingering persistent slab problems, but the likelihood of triggering continues to decrease as the overlying snowpack builds and continues to gain strength. Be wary of steep complex terrain with a shallow snowpack, where triggering a persistent weakness is more likely.

Avalanche Problems

Storm Slabs

New snow and changing winds will continue to build touchy slabs which could be triggered naturally, or by the weight of a person or snowmobile.
Be cautious as you transition into wind affected terrain.>Be aware of thin areas that may propagate to deeper instabilites.>Be cautious of sluffing in steep terrain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 5