Avalanche Forecast
Issued: Nov 24th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
zryan,
Avalanche Canada
Limited observations and the potential for large human-triggered avalanches necessitate a conservative start to the season.
Summary
Confidence
Avalanche Summary
During the storm last week, numerous natural wind slab and persistent slab avalanches were reported up to size 3 in Ningunsaw and Bear Pass.
Natural avalanche activity tapered with the storm. No new avalanches have been reported in the past few days.
Observations are very limited at this time of year. If you do head out, do so with a cautious and investigative mindset, and consider submitting a MIN report.
Snowpack Summary
40-70 cm of recent storm snow has been redistributed into wind slabs in the alpine and treeline. Surface conditions otherwise have been reported as 10-15 cm of dry snow overlying a series of crusts or moist snow.
Observations are limited, but a problematic crust/facet combination exists near the base of the snowpack in the Bear Pass and Ningunsaw area (likely elsewhere too). With total snowpack depths around 150 cm at 1000m, this layer is a concern for human triggering, particularly in shallow or variable depth snowpack areas in the alpine.
Weather Summary
Friday night
Cloudy with light rain, northwest alpine wind 30 to 60 km/h, treeline temperature 0°C.
Saturday
Mostly cloudy with a chance of light rain, northwest alpine wind 15 to 35 km/h, treeline temperature 0°C, freezing level 1100 m.
Sunday
Mostly cloudy with light flurries, southwest alpine wind 30 to 60 km/h, treeline temperature -2°C.
Monday
Cloudy with 1-5 cm of snow, southwest alpine wind 40 to 70 km/h, treeline temperature -2°C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Make observations and assess conditions continually as you travel.
- Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
- Avoid areas where the snow feels stiff and/or slabby.
Problems
Wind Slabs
Northwest wind accompanying last week's storm have formed wind slabs in the alpine and treeline.
Aspects: North, North East, East, South East, South, South West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
A weak layer of sugary facets overlying a crust have been reported near the base of the snowpack. Observations of this layer have been limited, but it is most likely to be problematic in steep, wind-loaded alpine terrain.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Nov 25th, 2023 4:00PM
