Avalanche Forecast
Issued: Dec 4th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
zryan,
Avalanche Canada
New snow will improve riding conditions, but bond poorly to the underlying crust. Although the forecasted size of avalanches is small, they will likely be reactive to human triggering.
Summary
Confidence
Weather Forecast
Saturday Overnight: Mainly cloudy with up to 5 cm of new snow overnight. Freezing level dropping to valley bottom. Moderate to strong southwest winds easing to light and shifting northwest.
Sunday: A brief ridge of high pressure over the Rockies. Flurries end in the early morning with skies clearing into the afternoon. Moderate westerly winds at ridgetop with freezing levels at valley bottom.
Monday: A cloudy start with up to 5 cm of new snow accumulation. Moderate to strong northwesterly winds easing into the afternoon.
Tuesday: Partially cloudy with isolated flurries. Strong southwesterly winds increase to extreme in the late afternoon.
Avalanche Summary
No new avalanches have been reported in the past 24 hours.
If you go out in the mountains, please share your observations and/or photos on the Mountain Information Network! ?
Snowpack Summary
15-20 cm of new snow sits on top of a thick rain crust on all aspects below 2400m. In the high alpine (above 2400m) new snow overlies a variety of wind-affected surfaces. Westerly winds will have redistributed the new snow into wind slabs in the alpine and treeline.
Previously, 2 early season crusts could be found in the snowpack below 2300m. It is likely that last week's rain has begun to break down these crusts, and amalgamated the lower snowpack into melt forms below the thick capping rain crust.
Snowpack depths range from 10-80cm 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 aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
- Wind slabs may be poorly bonded to the underlying crust.
- Keep in mind the crust offers an excellent bed surface for avalanches.
Problems
Wind Slabs
Westerly winds will redistribute new snow into wind slabs in the alpine and treeline. Wind slabs will fail easily where a thick rain crust is present below.
Aspects: North, North East, East, South East, South, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 5th, 2021 4:00PM
