Avalanche Forecast

Issued: Feb 9th, 2012 9:30AM

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

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

A firmly embedded ridge of high pressure in Alberta seems to be causing systems to fizzle once they reach the Columbia Mountains. On Friday light snowfall is expected but should taper-off with only trace amounts forecast for Saturday/Sunday. Winds should be light and west/northwesterly throughout the period with freezing levels peaking at about 1300m.

Avalanche Summary

Large chunks of cornice fall have been reported in recent days with limited effect on the slope below. Minor radiation sluffs on steep solar aspects. Otherwise, no new activity to report.

Snowpack Summary

Very warm alpine temperatures recently melted surface snow layers. A crust now exists to ridge top on solar aspects. Large weak cornices are plentiful and recently developed wind slabs may exist in certain areas. The upper snowpack appears to be settling well. Below about 1500m, crust/facet layers buried in early January are still causing some operators concern as well as widespread facets that were buried on January 20th. These layers represent a low probability/high consequence scenario. If you're traveling in the mountains now is a great time to take stock of current surface conditions (surface hoar, crusts) that will probably get buried at some point on Friday.

Problems

Cornices

An icon showing Cornices
Large cornices are looming over many slopes. They are weakest when it's warm and sunny. A falling chunk could trigger a large avalanche on the slope below.

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

Elevations: Alpine.

Likelihood

Possible

Expected Size

2 - 7

Valid until: Feb 10th, 2012 3:00AM