Avalanche Forecast

Issued: Nov 27th, 2017 4:59PM

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

jmcbride, Avalanche Canada

Lizard-Flathead.

As winter returns, wind and new snow will build pockets of wind slabs in lee areas in the alpine as well as exposed treeline areas. Assess how the new snow is bonding to the old crust before jumping in to any committing terrain.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Tuesday: Flurries, accumulation 5 cm. Moderate to strong southwest wind. Alpine temperature near -5. Freezing level 1100m.Wednesday: Mix of sun and cloud, isolated flurries. Moderate to strong west wind. Alpine temperature near -5. Freezing level 1000m.Thursday: Cloudy, isolated flurries. Strong west wind. Alpine temperature near -5. Freezing level 1000m.

Avalanche Summary

Large loose, wet avalanches were reported during last week's rain event. With the arrival of cooler temperatures over the weekend reports indicate that the snow surface has refrozen and no new avalanche activity has been reported. As wind redistributes the new snow however expect to find wind slabs in lee areas.

Snowpack Summary

At upper elevations about 5-10 cm of snow has fallen on the crust that formed after last week's rain and warm weather. The crust is up to 10 cm thick and extends to mountain top elevations on all aspects. The snowpack below the crust is moist to ground. Rain has washed away much of the snow below treeline.

Problems

Wind Slabs

Be cautious in lee and cross loaded areas where recent wind loading may have created wind slabs.

Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Nov 28th, 2017 2:00PM