Avalanche Forecast

Issued: Feb 20th, 2016 8:13AM

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

Avalanche Canada esharp, Avalanche Canada

Storm slabs are expected to remain reactive, especially if the sun comes out on solar slopes and on wind loaded features in the alpine.

Summary

Confidence

Moderate - Timing of incoming weather systems is uncertain on Monday

Weather Forecast

SUNDAY: partly cloudy with flurries starting in the afternoon, up to 10cm expected overnight, moderate southwesterly winds, freezing level of 1200m. MONDAY: lingering flurries with sunny breaks, moderate northeast winds, freezing level of 1000m. TUESDAY: mainly sunny, light variable winds, freezing level of 1000m.

Avalanche Summary

Numerous natural and artificially triggered storm slab, windslab, and cornice avalanches have been reported in the last couple of days. Storm slab avalanches are expected to be remain reactive to human-triggering with ongoing snowfall and wind, especially if the sun pokes out. Cornices are reported to large and fragile, and may fail under the weight of a person.

Snowpack Summary

Up to 80 cm of settling storm snow overlies a thick rain crust which extends into the alpine. The snow is reported to be bonding well to the crust and all the recent avalanches have been failing within the recent storm snow, not on the crust interface. At treeline and below, other crusts may exist in the upper snowpack due to the recently fluctuating freezing levels. Ongoing southeast through southwest winds have been loading leeward features in the alpine and large cornice development has been reported over the last few days. The weak surface hoar layer from early January can be found down over a meter and is still reactive in isolated snowpack tests but triggering an avalanche on this layer has become unlikely.

Problems

Storm Slabs

An icon showing Storm Slabs
Recent storm slabs continue to be reactive to rider triggers especially on wind loaded slopes. If the sun shines it may have enough punch to trigger natural avalanches.
Avoid freshly wind loaded features.>Choose conservative lines and watch for clues of instability.>The new snow will require time to settle and stabilize. >

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 3

Cornices

An icon showing Cornices
Looming cornices could collapse naturally and the weight of a person may be enough to cause a cornice failure.
Pay attention to overhead hazards like cornices.>Give cornices a wide berth when travelling on or below ridges.>

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 4

Valid until: Feb 21st, 2016 2:00PM

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