Avalanche Forecast

Issued: Mar 15th, 2015 9:14AM

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

Avalanche Canada bcorrigan, Avalanche Canada

Hazard will remain high at upper elevations and begin to trend downwards with cooling temperatures

Summary

Confidence

Fair - Freezing levels are uncertain

Weather Forecast

The Northwest Coastal region should see some sunny skies and dry out a bit before the next light Pacific system arrives late Tuesday. Freezing levels should drop close to valley bottom overnight and rise during the day to around 1200m.For more information check out the Mountain Weather Forecast at: http://www.avalanche.ca/weather

Avalanche Summary

Reports from late yesterday tell of numerous large, size 2 and 3,  natural and explosive controlled storm slab avalanches above 1000m as well as loose-wet natural avalanches between 1000 to 1500m.

Snowpack Summary

Strong southwest winds will have built dense slabs on lee features, and added additional load to the previous storm slab. Commercial operators are reporting 100+cm of new snow from the most recent storm ! There are a variety of old buried layers that include hard wind slabs, hard crusts, surface hoar, and/or surface facets. The recent lack of large avalanches suggests reasonable bonds at these interfaces, but we I would remain cautious of steeper, high-consequence slopes. A release on any of these buried layers could be large and destructive . At the base of the snowpack, weak facets may be found, particularly on shallow alpine slopes in the north of the region. Cornices are continuing to grow and will be potentially unstable. Recent rapid loading and strong winds are a major concern right now. Operators are estimating 50+cm of storm snow at upper elevations.

Problems

Storm Slabs

An icon showing Storm Slabs
Up to 100cm of new snow has fallen in the alpine and treeline, accompanied by strong winds.  This storm snow will take a while to stabilize.
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>Stay well back from cornices.>Be cautious as you transition into wind affected terrain.>Choose conservative lines and watch for clues of instability.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 5

Valid until: Mar 16th, 2015 2:00PM

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