Avalanche Forecast

Issued: Feb 6th, 2012 9:34AM

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

Avalanche Canada jlammers, Avalanche Canada

Summary

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

The ridge of high pressure should re-emerge for tuesday bringing clear skies for one more day. On Wednesday, expect increased cloud throughout the day. Trace amounts of snow are possible on Thursday. Freezing levels should rise gradually throughout the forecast period to 1000m on Thursday. Winds will be light and southerly switching to northwesterly by thursday.

Avalanche Summary

On Saturday a skier was injured in an avalanche near Kimberley. The size 2.5 slab released on a west facing, cross-loaded alpine slope. The crown varied in height, but was up to 1m deep. For more details, check-out the following link to our Incident Report Database: http://www.avalanche.ca/cac/library/incident-report-database/view/4a015304-42f6-4cc1-91e9-5450e2deec8f On Sunday explosives-controlled avalanches to size 3 were reported in the region in steep alpine terrain (north and west aspects). Some of these avalanches released within the mid-pack while 2 released at the ground.

Snowpack Summary

Cooling has helped the snowpack to gain some strength since the warming on the weekend and a crusts have now developed on most slopes that saw direct sun.On shaded aspects the upper snowpack is also well settled. Below this sits a fairly well bonded mid-pack. There are, however, a few exceptions. The Jan. 13th SH/FC combo has been reactive in the north of the region. As well, the mid December facet/surface hoar layer is buried approx. 80 cm on the east side and 200+ cm on the west side. Operators are talking less about this layer as of late. There are also basal facets at the ground which have continued to be reactive, especially in the thin snowpack parts of the region. Snowpack depths at 2000m sit near 2m deep. If you're traveling around the mountains, it's a good time to take notice of what layers are developing (surface hoar/ crusts) that may become an issue once buried.

Problems

Persistent Slabs

An icon showing Persistent Slabs
Recent avalanche activity indicates that deeply buried weak layers are still triggerable. A skier, sled or cornice fall could trigger a large avalanche, especially in thin snowpack areas or on unsupported, rocky terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

3 - 6

Cornices

An icon showing Cornices
Watch for tender cornices at ridge tops. They may be destructive by themselves and they may be a trigger for the slope below.

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

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 6

Valid until: Feb 7th, 2012 3:00AM

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