Avalanche Forecast

Issued: Dec 20th, 2011 4:35PM

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.

Landon Shepherd, Parks Canada

Jasper.

Continued strong winds have left only isolated pockets of snow throughout the alpine, expect hardslabs to be present in most places where the snow remains.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Wind effect is extremely variable

Problems

Wind Slabs

Windslabs have formed in sheltered lee features at Treeline, mostly near ridge tops and protected pockets in the Alpine.

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 3

Deep Persistent Slabs

Basal facet collapses are still being noted in test pits below midpack bridging layers. Shallow snowpack areas and rocky outcrops are likely trigger locations.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Valid until: Dec 21st, 2011 4:00PM