Avalanche Forecast

Issued: Dec 7th, 2011 4:00PM

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

a.l. horton, Parks Canada

Jasper.

Although the weather has cooled and is stable, the weak basal facets can still be easily triggered. Stay away from big steep slopes and travel cautiously.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

The weather pattern is stable on Thursday

Problems

Deep Persistent Slabs

These slabs are sitting over a weak basal facet layer. Most large avalanches that have been observed recently have been on this layer. It can be most easily triggered from shallow areas on the edge of fatter slopes.

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

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

2 - 3

Wind Slabs

This layer continues to settle and is becoming less of a concern. Steep cross loaded or lee slopes are likely trigger zones. Alpine snowpack depth remains highly variable. At treeline and below, travel is good and the snowpack is supportive.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Dec 8th, 2011 4:00PM