Avalanche Forecast

Issued: Feb 21st, 2016 8:05AM

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

Watch for pockets of wind slab and give cornices a wide berth.

Summary

Confidence

Moderate - Freezing levels are uncertain on Wednesday

Weather Forecast

MONDAY: flurries overnight with up to 4cm expected, becoming mainly sunny through the day, light and variable winds, 1500m freezing level. TUESDAY: mainly sunny light southeasterly winds, 1500m freezing level. WEDNESDAY: mainly sunny, light westerly winds, 1500m freezing level with an inversion and above freezing level extending possible in the alpine.

Avalanche Summary

Numerous natural and artificially triggered storm slab avalanches have been reported in the last couple of days. Wind slab avalanches are expected to be remain reactive to human-triggering.  Cornices are reported to large and fragile, and may fail under the weight of a person.

Snowpack Summary

Recent storm snow continues to settle and gain strength.  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.  About 80cm of snow now sits on a thick rain crust that extends into the alpine. The overlying snow is reported to be bonding well to this crust.  Wet snow is being reported at lower elevations and as the freezing level continues to drop, a crust is expected to form on the surface. The weak surface hoar layer buried in early January can be found down over a meter.  It is becoming increasingly hard to make this layer fail in snowpack tests and triggering an avalanche on it is 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: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Cornices

An icon showing Cornices
Cornices are expected to grow with the forecast snow and wind and may collapse naturally. 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

Unlikely - Possible

Expected Size

1 - 4

Valid until: Feb 22nd, 2016 2:00PM