Avalanche Forecast
Issued: Dec 4th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs.
MH,
Avalanche Canada
Triggering of the November 17th persistent weak layer remains possible in isolated terrain features. Assess the snowpack carefully before stepping out into large open slopes, especially around treeline.
Small pockets of wind slab may be lingering in the alpine.
Summary
Confidence
High
Avalanche Summary
On Sunday several sz 1-1.5 solar-induced loose dry avalanches occurred within the surface facet layer out of steep, rocky terrain. On Saturday Lone Pine produced a size 2 glide crack release which ran into the fan.
Reports of whumpfing and remote triggering of small unsupported pillows below tree line on the Nov 17 persistent slab continue.
Snowpack Summary
Surface snow is faceted due to the cold temps. The Nov 17 persistent slab (surface hoar 5-30mm, facets, and crust) is down 50-80cm with the largest surface hoar present on sheltered slopes at treeline and below.
Snowpack depth is still variable (~120cm at treeline), early season hazards remain a concern.
Weather Summary
Expect valley cloud for most of the day as the inversion layer and warm air aloft give way to colder temperatures again. The alpine high will be -12, winds will be from the West at 15-25km/hr.
Small amounts of snow over the next few days.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
Problems
Persistent Slabs
The Nov 17 surface hoar is down 50-80cm and most prevalent around tree line. The surface hoar continues to give 'sudden' results in snowpack tests.
Aspects: All aspects.
Elevations: Treeline, Below Treeline.
Likelihood
Expected Size
Valid until: Dec 5th, 2022 4:00PM
