Avalanche Forecast
Issued: Dec 5th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
trettie,
Avalanche Canada
Watch for blowing snow throughout the day. New thin wind slabs could form during the day.
Summary
Confidence
Moderate
Avalanche Summary
Minimal avalanche activity has been reported since the natural cycle of wind slab avalanches occurred during the initial onset of outflow winds on Wednesday (Nov 30).
Snowpack Summary
A new layer of surface hoar and facets has formed on the snow surface. It is possible that a new crust has formed as well. This crust may be found on steep southerly aspects and at higher elevations after the recent temperature inversion and clear skies.
Last week strong outflow winds scoured easterly slopes, created hard slabs on west and south slopes, and cross-loaded others.
A layer that formed in mid-November can be found down 70 to 100 cm deep at treeline and above. This layer consists of a crust below 1200 m and a layer of surface hoar above this elevation. This layer has not shown recent signs of instability.
The depth of the snowpack at treeline varies widely from 100 to 200 cm and tapers rapidly below treeline. Many early-season hazards such as rocks, stumps, and open creeks exist below treeline.
Weather Summary
Monday Night
Flurries starting tonight with trace amounts of new snow expected. Outflow winds decreasing and becoming westerly by early morning. Temperature inversion continues with -8 around 1500m.
Tuesday
Stormy with 10cm expected. Strong westerly winds. Temperature inversion breaks down with around -8 at 1500m and -6 near valley bottom.
Wednesday
Stormy with 15 to 30cm of new snow expected. Moderate to strong winds with temperatures at 1500m around -3.
Thursday
Stormy with around 15cm of new snow expected. Moderate southwest winds and temperatures at 1500m around -6.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- The best and safest riding will be on slopes that have soft snow without any slab properties.
- Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
- Recent wind has varied in direction so watch for wind slabs on all aspects.
Problems
Wind Slabs
Lingering wind slabs from previous outflow exist on a variety of aspects. They are generally becoming less reactive. In addition to these older wind slabs new ones could form throughout the day on Tuesday , these wind slabs will likely be easier to trigger but will likely be small and less consequential.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 6th, 2022 4:00PM
