Avalanche Forecast
Issued: Dec 20th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
TRettie,
Avalanche Canada
Use extra caution near ridge crests and steep roll overs. New storm and wind slab will form throughout the day as a result of the incoming weather.
Summary
Confidence
Weather Forecast
Monday night: No new snow expected. Low of -19 at 900m. Moderate to strong Northwest winds.
Tuesday: 15cm of new snow with strong Southwest winds. High of -12 at 900m.
Wednesday: some flurries with light North winds. High of -10 at 900m.
Thursday: no new snow expected. Light to moderate North wind and a high of -14 at 900m.
Avalanche Summary
Several Loose dry avalanches to size 2 were observed on Westerly aspects.
Explosives triggered several size 2.5 avalanches on lee and cross loaded features on Southerly aspects at 1700m.
Snowpack Summary
Variable winds over the last week mean wind slab could be found on all aspects in exposed terrain.
The December 18th surface hoar/facet layer is down 15cm.
The December 7 persistent weak layer is now typically down 50-70 cm, though some professional operations are saying that it is getting harder to find. This interface may include a crust, facets, or surface hoar.
Snowpack depths vary greatly across the region, expect to find anywhere from 100-300 cm of snow around treeline.
Terrain and Travel
- Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
- Recent wind has varied in direction so watch for wind slabs on all aspects.
- Watch for fresh storm slabs building throughout the day.
Problems
Storm Slabs
New storm and wind slab will form as a result of the incoming weather. Sensitivity to triggering will be greatest where wind effect is evident.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 21st, 2021 4:00PM
