Avalanche Forecast

Issued: Dec 2nd, 2015 7:58AM

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

Avalanche Canada triley, Avalanche Canada

Avalanche danger increasing to HIGH with the forecast storm overnight.

Summary

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Strong southerly winds combined with heavy precipitation and rising freezing levels are forecast overnight. This storm is expected to continue during the day Thursday. Expect 30 70 mm of precipitation by Thursday evening. Friday should be a bit of a break between storms. Another warm, wet, and windy storm is forecast for Saturday. The models are disagreeing on how warm this storm will be, but they do agree that it will pack a lot of moisture. We should have a better idea of Saturday freezing levels by tomorrow.

Avalanche Summary

No recent avalanches have been reported. I suspect that new storm slabs are bonding poorly in some areas and may be easy to trigger with light additional loads.

Snowpack Summary

Below you can see a description of the "foundation" of the snowpack, everything is about to change with a series of snow and wind events forecast over the next few days. Forecast storm snow is likely to build slabs, which may bond poorly to the current surfaces including hard slabs, crusts, facets and surface hoar. The snowpack is highly variable across different aspects and elevations. There is anywhere from 30-150 cm on the ground. Previous northerly outflow winds scoured upwind slopes back to a firm crust, and created wind slabs on lee aspects, which are gradually gaining strength. Shallow snowpack areas are rotten (facetted).

Problems

Storm Slabs

An icon showing Storm Slabs
Heavy precipitation and strong winds are forecast to continue to develop storm slabs on all aspects. Storm slabs may not bond well to old surfaces, and may be triggered naturally or by light additional loads.
Avoid freshly wind loaded features.>Minimize exposure during periods of heavy loading from new snow, wind.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely - Very Likely

Expected Size

1 - 5

Valid until: Dec 3rd, 2015 2:00PM