Avalanche Forecast

Issued: Nov 30th, 2013 9:02AM

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

bcorrigan, Avalanche Canada

Northwest Coastal.

Precipitation with strong winds event happening on the North Coast. If you have avalanche data or information please send it toforecaster@avalanche.ca

Summary

Confidence

Fair - Freezing levels are uncertain

Weather Forecast

Cold arctic air will move into the region with the passing of the Pacific frontal systems. The arctic air is forecast to stay in the region for the remainder of the week. Winds will change from southwest to north then northeast by Tuesday.

Avalanche Summary

No avalanches reported yet, however, expect activity on wind slabs that develop during the storm. The added load of new snow and wind transported snow may overload weak layers.

Snowpack Summary

Destructive wind slabs exist at tree line and above on east and northeast lee slopes. Rain at lower elevations has saturated the lower snowpack and will stabilize when the arctic air arrives. Deeply buried October crust may become reactive with the weight of the new snow. Little is known about the extent of this layer with regards to the aspect and elevations where it can be found.

Problems

Wind Slabs

Use caution on wind loaded lee slopes. New snow load may trigger buried weak layers. The possibility of avalanches is increasing.

The new snow will require several days to settle and stabilize.>Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>

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

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 3

Valid until: Dec 1st, 2013 2:00PM