Avalanche Forecast

Issued: Apr 12th, 2012 4:00PM

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

mike.koppang, Alberta Parks

Kananaskis.

An isothermal snowpack is now being found below treeline in many areas. The sun is forecast to come out later in the day on Friday so watch for stability to decrease as temperatures warm up.

Summary

Confidence

Poor - Due to limited field observations on Thursday

Weather Forecast

Light rain to continue overnight possibly changing to snow during the evening as freezing levels are forecast to drop to 1700m. Winds will continue to be variable but moderate SW winds will be the dominant direction. The sun may shine through the clouds on Friday so we can expect some decreases in stability related to daytime warming when the sun comes out.

Avalanche Summary

Numerous loose wet slides at lower elevations due to rain. Limited visibility into higher elevations.

Snowpack Summary

Snowpack becoming isothermal at lower elevations due to rain. Minimal freeze overnight.

Problems

Loose Wet

Loose wet slides up to sz 1.5 occurred on Thursday on all aspects. Pay close attention to terrain that is overhead as you travel. When the sun does come out, stability will rapidly deteriorate so pay close attention to the aspect you are skiing on.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Very Likely - Certain

Expected Size

1 - 4

Persistent Slabs

The Feb surface hoar and basal facets are a concern in the snowpack. Solar radiation and large loads, such as cornices, have triggered avalanches up to size 3.5 recently. The spring transition could see more slides stepping down to these layers.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

2 - 7

Cornices

Cornice failures are becoming more common as temperatures warm up. Pay close attention to whats overhead or affecting your planned trip.

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

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

1 - 3

Valid until: Apr 13th, 2012 9:00AM