Avalanche Forecast

Issued: Dec 10th, 2011 4:02PM

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.

The alpine and exposed tree line has been hammered by SW winds. Expect slab conditions on any wind exposed slope. Sheltered glades will offer the best skiing.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Problems

Deep Persistent Slabs

The weak basal facet layer is bridged by a supportive mid-pack below treeline and by hard slab on wind exposed features at treeline and above. This weakness is most likely triggered from thin areas in or on the edge of large open slopes.

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

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

2 - 3

Wind Slabs

There is a veneer of wind slab on lee slopes ranging from soft slab on more sheltered slopes to hard slab on exposed slopes. Human triggering is possible which may then step down to the basal facet layer resulting in a large full path avalanche.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

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