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Avalanche Forecast

Archived

Dec 1st, 2025–Dec 2nd, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary, Lizard-Flathead, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, Ymir, Akamina, Flathead, Lizard, Crawford, Moyie, St. Mary, Kokanee.

New snow and strong upper-elevation winds may form fresh wind slabs that a person could trigger.

Assess steep slopes for dense or stiff snow before committing.

Confidence

Low

Avalanche Summary

On Sunday, explosive control was able to produce a 1.5 storm slab on a northwest aspect.

Snowpack Summary

Up to 10 cm of new snow is possible. This, combined with strong wind, may form fresh, small, and isolated wind slabs. The upper snowpack is variable, with wind-affected surface snow in open terrain and soft and faceted snow or surface hoar in sheltered areas. This overlies a crust that formed in early November. The lower snowpack consists of multiple crusts.

Total snowpack depths are roughly 80 to 120 cm, tapering quickly at lower elevations.

In many areas, especially below treeline, there is not enough snow to smooth out surface roughness or reach the threshold needed for avalanches.

Weather Summary

Monday Night

Cloudy with new snow 3 to 8 cm. 20 to 40 km/h gusty west ridgetop wind. Treeline temperature -9 °C.

Tuesday

Mostly cloudy with light flurries and some sunny periods. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -8 °C.

Wednesday

Cloudy with isolated flurries. 10 to 20 km/h west ridgetop wind. Treeline temperature -7 °C.

Thursday

Cloudy with snow 5 to 10 cm. 10 to 15 km/h southwest ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Make observations and continually assess conditions as you travel.
  • Be cautious of buried obstacles, especially below treeline.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.