Avalanche Forecast

Issued: Apr 26th, 2012 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is considerable. Known problems include Loose Wet and Deep Persistent Slabs.

a.l. horton, Parks Canada

Jasper.

Cooler overnight temperatures will create a melt freeze crust from the alpine to treeline. The hazard is reduced while this crust is intact. Warm temperatures, sun exposure and precipitation in the form of rain will increase the hazard rapidly.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Freezing levels are uncertain on Friday

Problems

Loose Wet

The freezing level will drop below treeline Thursday with rain turning to snow overnight. Expect continued unstable isothermal conditions below treeline, possibly extending to treeline as temperatures increase during the day.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Deep Persistent Slabs

Large triggers such as cornice failure could release large slab avalanches on several deep failure planes including ground, especially on steep slopes with a smooth rock slab bed surface.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 3

Valid until: Apr 27th, 2012 4:00PM