Avalanche Forecast

Issued: Dec 10th, 2011 4:00PM

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

chris gooliaff, Parks Canada

Banff Yoho Kootenay.

The chance of human triggering will continue to decrease with a long period of cool weather and little precipitation forecast through next week. Facetting and slow weakening will be the next long term trend for the snowpack.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Problems

Deep Persistent Slabs

The weak base of depth hoar and facets is now less sensitive to human triggering , however skier triggered and natural avalanches have recently been observed on this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

2 - 3

Wind Slabs

Strong winds have been moving snow from the west and north for the past week and hard wind slabs have formed. It is likely that any slab will step down to the weak base. Choose moderate slope angles & low consequence terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

2 - 3

Valid until: Dec 11th, 2011 4:00PM