Avalanche Forecast
Issued: Dec 19th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
TRettie,
Avalanche Canada
Use Caution near ridge crests in treeline and alpine. Rider triggerable wind slab can still be found.
Summary
Confidence
Weather Forecast
Sunday night: moderate North winds with a low of -19 at 900m. No new snow expected.
Monday: Sunny. No new snow expected. moderate to strong North winds. High of -15 at 900m.
Tuesday: 15cm of new snow with extreme West winds. High of -12 at 900m.
Wednesday: some light flurries with light East winds. High of -10 at 900m.
Avalanche Summary
On Saturday one natural wind slab size 1.5 was observed on a South aspect at 1500m.
Snowpack Summary
Variable winds over the last week mean wind slab could be found on all aspects in exposed terrain in the alpine and treeline.
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.
- Be alert to conditions that change with elevation and wind exposure.
- Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
Problems
Wind Slabs
Wind slab can still be found in exposed terrain. Sensitivity to triggering will be greatest where wind slab has formed over surface hoar.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 20th, 2021 4:00PM
