Avalanche Forecast

Issued: Dec 15th, 2012 8:12AM

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

Avalanche Canada triley, Avalanche Canada

Summary

Confidence

Fair - Intensity of incoming weather is uncertain on Monday

Weather Forecast

Overnight and Sunday: Light to moderate Southwest winds should become more westerly overnight and during the day Sunday. Very light precipitation should bring 0-2 cms during the day Sunday. Freezing level is expected to remain at valley bottom and alpine temperatures should be -12.0.Monday: The next system is forecast to move into the region by Monday morning. Expect moderate precipitation overnight bringing 5-10 cms of snow by morning and another 5 cms during the day. Strong Southwest winds are forecast during the storm and the freezing level should remain at the valley bottom.Tuesday: Cool and unsettled conditions in the wake of Mondays storm. Some convective flurries may cause another 5-8 cms during the day.

Avalanche Summary

There have been no avalanches reported in the last couple of days. We did get one report of a human triggered wind slab from about 4 days ago. With the recent cold temperatures, wind slabs may be slow to bond to the old surface.

Snowpack Summary

Variable snowpack conditions exist across the sub-regions of the South Rockies. The West of the region resembles the Lizard range with a little less overall depth to the snow pack. As you move to the East the snowpack depths gradually become more shallow. Expect to find wind slabs that have developed over the past 4-5 days in all areas at higher elevations. There continues to be some discussion about the early November rain crust. You may be able to find this crust in areas that had snow on the ground when that rain event happened. However, the crust has not been active.

Problems

Wind Slabs

An icon showing Wind Slabs
Wind slabs exist at higher elevations and at treeline in areas that were open to the Westerly winds. Wind slabs are reported to be stiff and stubborn, but may still be triggered by the additional load of a skier or rider.
Be cautious as you transition into wind affected terrain.>Stay off recent wind loaded areas until the slope has had a chance to stabilize.>Stay well to the windward side of corniced ridges.>

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 4

Valid until: Dec 16th, 2012 2:00PM