Avalanche Forecast

Issued: Dec 25th, 2013 7:58AM

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

Avalanche Canada jlammers, Avalanche Canada

Summary

Confidence

Fair - Intensity of incoming weather systems is uncertain on Thursday

Weather Forecast

Thursday: Moderate snowfall / Moderate southwest winds with extreme gusts / Freezing level at 1800mFriday: Light snowfall / Light southwest winds with strong gusts / Freezing level at 1300mSaturday: Mainly sunny / light winds / Freezing level at 1100m

Avalanche Summary

A few size 1 human triggered wind slabs were observed on Tuesday at treeline and in the alpine. No other avalanches were reported.

Snowpack Summary

Moderate amounts of storm snow which fell Sunday have gained significant strength. Dribs and drabs of more recent snow may have been shifted into pockets of windslab by strong southwest winds. Roughly 20-45cm below the surface you may find a variety of old surfaces which formed during the early December cold snap. These surfaces include sugary faceted snow (which may overlie a crust in some areas) and spotty surface hoar in sheltered terrain. In most places the overlying slab seems to be well bonded to this interface thanks to ongoing moderate temperatures.Snowpack depths vary greatly across the region, but are significantly lower than average for this time of year. Terrain below treeline is still mostly below threshold for avalanche activity. Early season riding hazards such as rocks, stumps and logs are lurking below the surface in many areas. In glaciated terrain new snow on the surface might be just enough to hide open crevasses where supportive snow bridges have not yet developed.

Problems

Storm Slabs

An icon showing Storm Slabs
Forecast snowfall and strong southwest winds will create new storm slabs at treeline and above. Watch for increased reactivity in wind-loaded pockets of terrain.
Be cautious as you transition into wind affected terrain.>Stay off recent wind loaded areas until the slope has had a chance to stabilize.>Be alert to conditions that change with elevation.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 3

Valid until: Dec 26th, 2013 2:00PM