Avalanche Forecast

Issued: Jan 22nd, 2012 4:00PM

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

a.l. horton, Parks Canada

Jasper.

Wind slab continues to develop on lee aspects by moderate SW winds. Avoid steep wind-loaded slopes especially above terrain traps, cliffs and other similar hazards.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Due to the number and quality of field observations on Monday

Problems

Wind Slabs

Moderate SW winds have been building thin wind slabs on lee slopes and terrain features in the alpine. Slopes look thick and pillowy, but no avalanches were observed and we did not observe any cracking or other signs of propagation on these slabs.

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

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1 - 3

Deep Persistent Slabs

All though few and far between, large avalanches continue to be observed by large loads (large cornice fall) on this layer. Corniced steep slopes on rocky terrain should be avoided.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 4

Valid until: Jan 23rd, 2012 4:00PM