Avalanche Forecast

Issued: Mar 9th, 2015 9:24AM

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

Avalanche Canada triley, Avalanche Canada

Forecast warm temperatures and strong solar radiation may result in easy triggering of storm slabs.

Summary

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

Cloudy overnight with alpine temperatures around -5 and freezing levels dropping down to about 1400 metres. Expect a mix of sun and cloud on Tuesday with freezing levels rising up to about 2200 metres and moderate southwest winds. Cloudy with light precipitation on Wednesday combined with strong southwest winds and freezing levels around 2000 metres. Thursday should be mostly cloudy with strong southwest winds and 2000 metre freezing levels.

Avalanche Summary

Several windslab avalanches up to size 2.0 were reported on Sunday that were 20-30 cm deep on northerly aspects in the alpine and at treeline. I suspect that the size and likelihood of windslab and new storm snow avalanches has increased with the new snow.

Snowpack Summary

New snow and strong winds have developed wind slabs that have been reported to be 40-60 cm deep. The new snow is sitting on various old surfaces that includes dry new snow, loose facetted snow, wind slabs, and sun crusts. The mid-February crust is down around 10-30 cm below the new snow. 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.

Problems

Storm Slabs

An icon showing Storm Slabs
New snow and strong winds have developed new storm slabs in the alpine and at treeline.
Minimize exposure during periods of heavy loading from new snow, wind.>The new snow will require several days to settle and stabilize.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 4

Valid until: Mar 10th, 2015 2:00PM

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