Avalanche Forecast

Issued: Jan 5th, 2013 9:16AM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Storm Slabs.

Avalanche Canada jfloyer, Avalanche Canada

Summary

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Sunday: 5-10 cm new snow with generally light southeasterly winds sometimes gusting to 40 km/h. Treeline temperatures around -5C. Monday: 5-10 cm new snow with moderate to strong southeasterly winds gusting to 50 km/h. Treeline temperatures around -5C. Tuesday: 10-20 cm new snow most likely arriving later on in the day. Mostly light winds during the day, increasing later on. Freezing level rising to 1100 m in the afternoon. Note: the current weather pattern is not well defined by weather models. There is the possibility for significant variations from the above best estimates.

Avalanche Summary

No recent avalanches have been reported. Cornice chunks falling onto slopes have not triggered slabs.

Snowpack Summary

Incoming snow may not bond well to existing snow surfaces including surface hoar (up to 20 mm in size), facets, hard wind slabs or a sun crust. Storm slab problems may develop very quickly once it begins snowing. Recent SE winds have formed new wind slabs at alpine and treeline elevations, while older wind slabs appear generally well settled. No significant shears have been observed recently in the top or mid snowpack layers. Near the base of the snowpack, a crust/facet layer exists which is now unlikely to be triggered, except perhaps by heavy triggers in steep, shallow, rocky terrain where more facetting has taken place.

Problems

Storm Slabs

An icon showing Storm Slabs
New snow may not bond well to the old snow surface. Winds are also likely to transport snow onto downwind slopes, leaving wind slabs behind.
Note recent avalanche activity.>Avoid freshly wind loaded features.>Highmark or enter your line well below ridge crests to avoid wind loaded pillows.>Start on small terrain and use safe slope-cutting techniques to cut the top of slopes before riding them.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

1 - 4

Valid until: Jan 6th, 2013 2:00PM

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