Avalanche Forecast

Issued: Feb 10th, 2012 9:32AM

The alpine rating is moderate, the treeline rating is low, and the below treeline rating is low. Known problems include Cornices.

Avalanche Canada jlammers, Avalanche Canada

Summary

Confidence

Good - -1

Weather Forecast

A firmly embedded ridge of high pressure over Alberta seems to be causing systems to fizzle once they reach the Columbia Mountains. Conditions will be mostly cloudy for the forecast period with the possibility of trace amounts of snowfall each day. Winds will be light and northwesterly with alpine temperatures trending from -7.0 on Saturday to -13.0 by Monday.

Avalanche Summary

No new avalanche activity to report.

Snowpack Summary

In general, the upper snowpack is now well settled and riders are shredding pretty much everything. Very warm alpine temperatures from last weekend melted snow surfaces and a crust now exists to ridge top on solar aspects. There are reports of wind slabs in the alpine that developed earlier in the week. My feeling is that they are not widespread and probably gaining strength. Deeper weaknesses in the snowpack are less of a concern; however, in the southern end of the region there is still talk of basal facets as some operators are avoiding thin and rocky alpine features. This represents a very low probability-high consequence scenario. Large cornices are also widespread in the alpine. A dusting of new snow now sits on weak snow crystals that developed over the past week (surface hoar/crusts/facets). This will be the big thing to watch as the overlying slab evolves.

Problems

Cornices

An icon showing Cornices
Large and unsupported cornices exist in the alpine. Failing cornices are destructive by themselves and have potential to trigger avalanches on the slope below.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 6

Valid until: Feb 11th, 2012 3:00AM

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