Avalanche Forecast

Issued: Nov 18th, 2011 4:01PM

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

A.L. Horton, Parks Canada

Jasper.

A significant wind event is forecast to begin on Sunday as the cold air is replaced by a warmer wetter system. The avalanche hazard may rise.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

The weather pattern is stable on Saturday

Problems

Wind Slabs

An specific avalanche cycle occurred today from wind loading on steep (40-50 deg), SE slopes below ridge lines and on cross loaded features between 2600 and 2900 m. Avalanches up to size 3 were observed in this terrain along the Icefield Parkway.

Aspects: North, North East.

Elevations: Alpine.

Likelihood

Possible - Likely

Expected Size

1 - 3

Persistent Slabs

Slabs created by previous Moderate W to NW winds overlay weak basal facets. A large load (surface avalanche, numerous skiers on the slope) could possibly trigger this layer.

Aspects: North, North East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 3

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