Avalanche Forecast

Issued: Dec 18th, 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, Wind Slabs and Storm Slabs.

Garth Lemke, Parks Canada

Jasper.

With up to 35cm of storm snow in isolated locations, very little natural activity was noted and visibility was excellent. Don't be lulled into false sense of security as many slopes may be awaiting the human trigger.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Problems

Deep Persistent Slabs

Basal facet collapses are still being noted in test pits yet layers are bridging well above. Caution likely shallow snowpack trigger zones.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Wind Slabs

Windslabs persist near exposed ridgetops and cross loaded gulleys.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1 - 3

Storm Slabs

Anywhere from 5-35cm of new snow fell Saturday evening. It appears to be bonding well as winds were light and temperatures warm when storm arrived. Winds are just now slabbing the storm snow.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Dec 19th, 2011 4:00PM