Avalanche Forecast

Issued: Dec 9th, 2011 9:10AM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Wind Slabs and Persistent Slabs.

Avalanche Canada mpeter, Avalanche Canada

Summary

Confidence

Fair - Due to limited field observations

Weather Forecast

Saturday: Expect high cloud to develop with a chance of flurries late in the day. Winds will remain southwesterly from 50-70 km/h. Freezing levels should remain on the surface. Sunday & Monday: The ridge should re-build giving dry conditions. Winds turn westerly with freezing levels peaking at 1500m on Monday.

Avalanche Summary

There are no new avalanche observations.

Snowpack Summary

Some areas have seen a trace of new snow (less than 5cm), but beyond this the region has seen little change. Surface hoar continues to grow in sheltered locations and the cold temperatures are penetrating the upper snowpack to promote near surface facetting. There is some sun crust formation on steep south through west aspects. Hard windslabs linger in the alpine and open treeline locations but are softening due to the facetting phenomena. Some areas have a rain-crust below treeline from the 28th of November that has been buried by about 20 cms of snow. This rain-crust may be developing facets, and could become a layer of interest after it is buried by more of a load. The early November surface hoar remains a layer of concern. It is buried 100-150 cms and stability tests show that this layer is getting harder to trigger. However, if an avalanche does release on this layer, it is likely to be very large and destructive.

Problems

Wind Slabs

An icon showing Wind Slabs
Hard windslabs linger in immediate lee locations.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Persistent Slabs

An icon showing Persistent Slabs
Probability has decreased, but it is still possible to trigger from thin snowpack areas (around rocks and convexities). This layer may be capable of producing highly destructive avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

3 - 6

Valid until: Dec 10th, 2011 8:00AM

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