Avalanche Forecast
Issued: Nov 28th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
cgarritty,
Avalanche Canada
The main place to trigger an avalanche right now is in a steep, wind-loaded gully. There isn't much holding the snowpack in place! Early Season Conditions prevail.
Summary
Confidence
Avalanche Summary
Last Thursday, a human-triggered size 1 was reported near Invermere at treeline on a west-facing slope. This avalanche failed on the facets at the base of the snowpack.
Observations are limited this time of year. Please consider filling out a MIN report if you do head out in the backcountry! 🙏
Snowpack Summary
Surface conditions are an uninspiring mix of heavily wind-affected surfaces, melt-freeze crust on solar aspects, and 10-15 cm of faceting low density snow in sheltered and shaded areas below this elevation. Large surface hoar has been spotted growing on most of these.
A crust with facets or depth hoar exists at or near the ground, which has produced avalanches in the East Purcells and nearby Kananaskis Country. The snowpack is shallower than average for this time of year with depths at treeline ranging from 20 -50 cm, and tapers rapidly below.
Expect early-season conditions.
Weather Summary
Tuesday Night
Valley cloud remaining below 2000 m. west alpine wind 5-40 km/h, strongest in the alpine. Above freezing layer at 2500 m diminishing.
Wednesday
Mainly sunny with valley cloud remaining below 2000 m. Northwest alpine wind 5 to 30 km/h, strongest in the alpine. Treeline temperature -9 °C.
Thursday
Becoming cloudy. South alpine wind 5 to 10 km/h. Treeline temperature -11 °C.
Friday
Mainly cloudy. Southwest alpine wind 5-15 km/h. Treeline temperature -10.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid areas where the snow feels stiff and/or slabby.
- Avalanche danger is often elevated in alpine gullies where snow has accumulated.
- Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.
Problems
Wind Slabs
Pockets of wind-loaded snow sitting atop a weak, facetted lower snowpack may be found at higher elevations, primarily in east facing terrain features.
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 29th, 2023 4:00PM
