Avalanche Forecast

Issued: Mar 8th, 2015 8:30AM

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

Avalanche Canada triley, Avalanche Canada

Forecast winds are expected to continue to develop pockets of new windslabs in the alpine.

Summary

Confidence

Good

Weather Forecast

Cloud developing overnight with moderate southwest winds and freezing levels dropping down to about 1200 metres. A mix of sun and cloud on Monday with freezing levels rising up to about 2200 metres. Mostly sunny on Tuesday with light southwest winds and freezing levels around 2300 metres. Cloudy with snow on Wednesday combined with moderate southwest winds and slightly lower freezing levels.

Avalanche Summary

One report of a large (possible size 3.0) avalanche in the Gold Range of the Monashees that was viewed from a distance with binoculars. This avalanche occurred in extreme terrain and is expected not to be cornice triggered. Warming temperatures this week and high freezing levels are a concern for persistent weak layers "waking up."

Snowpack Summary

Variable recent storm snow totals across the region are generally in the 5-25 cm range. The snow surface varies with elevation and aspect with respect to sun and wind exposure, and includes dry new snow, loose facetted snow, wind slabs, and sun crusts. The mid-February crust is down around 10-30 cm where it is not wind loaded or scoured. The late-Jan crust/surface hoar layer (up to 100 cm deep) and the mid-January surface hoar (80-120 cm deep) are generally dormant, and chances of triggering these weaknesses have decreased. However, triggering may be possible with a large input such as cornice fall, or an avalanche stepping down, especially on slopes that see a lot of sun.

Problems

Wind Slabs

An icon showing Wind Slabs
Shifting wind directions continue to re-deposit surface snow into pockets of windslab in the alpine. Cornices may also be weakened by the changing winds, and forecast high freezing levels.
Use caution in lee areas in the alpine. Recent wind loading has created wind slabs.>Stay well to the windward side of corniced ridges.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Mar 9th, 2015 2:00PM

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