Avalanche Forecast

Issued: Jan 5th, 2012 4:00PM

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

marc ledwidge, Parks Canada

Banff Yoho Kootenay.

Significant precipitation last night and this morning has increased the load over the deep persistent weak layer of basal facets. Any avalanches triggered on this layer will be significant.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Problems

Wind Slabs

Wind slabs up to 1m deep can be triggered by a person in avalanche terrain. An additional 20 to 30 cm of snow in the past 24 hours has increased the likelihood of triggering these slabs.

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

Elevations: Alpine.

Likelihood

Possible - Likely

Expected Size

1 - 3

Deep Persistent Slabs

If surface slabs are triggered, they now have enough mass that stepping down to the basal facets is likely especially on larger slopes that have not yet avalanched.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

2 - 3

Valid until: Jan 6th, 2012 4:00PM