Avalanche Forecast

Issued: Dec 2nd, 2021 4:00PM

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

Avalanche Canada zryan, Avalanche Canada

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Low hazard doesn't mean no hazard! Watch out for lingering wind slabs in the alpine formed during Wednesday's storm. Tricky travel conditions exist at all elevations.

Summary

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

Thursday overnight: A building ridge of high pressure will bring mainly clear skies. Freezing levels will reach valley bottom, winds easing into the moderate range at ridgetop from the west.

Friday: Friday morning, a ridge of high pressure over the Rockies will bring clear skies and cold temperatures, and light to moderate westerly ridgetop winds. In the afternoon, high cloud will develop as another low-pressure system approaches from the pacific. Light flurries may develop late afternoon. 

Saturday: 5-10 cm of new snow can be expected overnight and into Saturday morning. Moderate to strong southwest winds are increasing and shifting northwest late in the day. 

Sunday: High pressure will reestablish. Mainly clear skies, light to moderate westerly ridgetop winds, and freezing levels at the valley bottom. 

Avalanche Summary

On Thursday, Fernie Alpine Resort reported several loose wet avalanches size 1-1.5 from steep features. 

We have had very few reports in the area, if you head out please share your observations and/or photos on the Mountain Information Network! ?

Snowpack Summary

Cold temperatures will form a capping rain crust on the snow surface as a result of heavy rain soaking the upper snowpack. In the high alpine (above 2400m) up to 50 cm of moist new snow accumulation is possible from Wednesday's storm. 

Previously, the mid-November rain crust could be found near the base of the snowpack. It is likely that rain has mainly broken-down this crust at treeline and below, and amalgamated the snowpack into uniform melt forms.

Snowpack depths range from 10-80 cm at treeline elevations. Higher elevations may hold a deeper snowpack, but will also be more heavily impacted by recent winds. Rain has washed away the snowpack below 1900m. 

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Watch for areas of hard wind slab on alpine features.

Problems

Wind Slabs

An icon showing Wind Slabs

Wind slabs may have formed in the alpine during Wednesday's storm. Watch out for areas of hard wind slab as you transition into the alpine.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 1.5

Valid until: Dec 3rd, 2021 4:00PM

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