Avalanche Forecast
Issued: Dec 12th, 2013 8:30AM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
triley,
Avalanche Canada
Avalanche danger is expected to remain HIGH tomorrow in the Alpine and then increase to HIGH at all elevations due to the next pulse of warm Pacific moisture on Saturday.
Summary
Confidence
Fair - Intensity of incoming weather systems is uncertain
Weather Forecast
Overnight and Friday: Snow this evening is expected to end during the night. Winds will remain strong Westerly during the day and the freezing level should drop back down below 1000 metres.Saturday: The next strong pulse of Pacific moisture should start overnight Friday or early Saturday morning. Heavy snowfall 30-50 cm with extreme Southwest winds and rising freezing level to about 1600 metres.Sunday: Precipitation should taper off to flurries by morning. Winds will remain strong Southwesterly and freezing levels should drop down to about 700 metres.
Avalanche Summary
The warm new storm snow is not expected to bond well to the shallow weak snowpack. Expect natural avalanche activity and easy triggering from skiers and sledders.
Snowpack Summary
The new storm slab continues to grow. Strong Southwest winds are transporting snow and developing deep pockets that are sitting above recent weak surface layers. Rising temperatures during the storm are expected to develop a relatively warm storm slab above a cold layer of wind crusts, surface hoar and surface facets. Snow profile information from the Shames area on Monday before the storm on a South-Southwest aspect at 950 metres, showed a 70 cm base with loose snow in the top 20 cms above a stiff 4 cm crust that is sitting above a softer facet layer. There was another hard crust about 30 cms above the ground. The new storm is a great deal of change for this young and weak snowpack to handle.
Problems
Storm Slabs
The storm slab is continuing to build. Expect natural avalanche activity during the storm. Strong winds, rising temperatures, and heavy loading of new snow may create a cohesive slab that is very easy to trigger.
Use conservative route selection, stick to moderate angled terrain with low consequence.>Minimize exposure during periods of heavy loading from new snow, wind.>
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 13th, 2013 2:00PM
