Avalanche Forecast

Issued: Dec 22nd, 2011 4:00PM

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

Brad White, Parks Canada

Banff Yoho Kootenay.

Cool fairly benign weather until Sunday will mean no real change in the snowpack. Low elevation areas are weak with no slab. Deep persistent instabilities are still the major concern and cautious terrain selection is dictated. JBW

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Problems

Wind Slabs

There are some small fresh wind slabs and ripe cornices that could be triggered on lee features. In some cases the slabs may be enough to trigger the deep basal instability.

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Deep Persistent Slabs

The basal weakness of depth hoar and October crust can still be triggered by light loads in the right location. Steep high consequence slopes should be avoided. Stick to moderate angled terrain with a thicker snowpack.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Valid until: Dec 23rd, 2011 4:00PM