Avalanche Forecast

Issued: Feb 14th, 2012 9:02AM

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

Avalanche Canada triley, Avalanche Canada

Summary

Confidence

Good - -1

Weather Forecast

Temperatures should drop down to about -12.0 in the alpine by Wednesday morning. The ridge of high pressure is expected to continue to bring clear skies and light winds during the day Wednesday. Alpine temperatures may rise above freezing on solar aspects, but should remain slightly below freezing on shaded aspects. Cloud should move into the region overnight and precipitation is expected to begin by about noon on Thursday. Western parts of the region may get 5 cm combined with moderate southerly winds. The freezing level should rise to 900 metres during the day and drop back to near valley bottom overnight. Another ridge is forecast for Friday that should bring mostly clear skies and light winds during the day.

Avalanche Summary

One size 2.5 natural dry slab avalanche was reported on a SE aspect at about 2400 metres elevation.

Snowpack Summary

The new snow layer above the February 09 surface hoar is now about 10-15 cm thick. There has been very little wind during the recent flurries. Some areas have reported that the surface hoar had grown to 50 mm before being buried. Some thin windslabs have developed due to down flowing air on large glaciated features. A melt-freeze crust has developed on solar aspects at all elevations, and on all aspects below about 1400 metres. The mid-pack is generally well settled. There is some concern that large loads like cornices may trigger the Jan. 20th facet layer. Some shallow snowpack areas may continue to have a weak layer of basal facets near the ground.

Problems

Cornices

An icon showing Cornices
Cornices are large and may become weak and fall off naturally. Large loads like cornices may trigger slab avalanches on the slopes below.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 5

Valid until: Feb 15th, 2012 3:00AM