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Avalanche Forecast

Archived

Dec 2nd, 2025–Dec 3rd, 2025

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

Moderate

Avalanche Summary

On Monday, wind slabs up to size 2 were reactive to rider triggering. This may continue on Wednesday with the recent snow and shifting winds. Dry loose sluffing may be seen from steep terrain features.

Snowpack Summary

At treeline and above, 8–12 cm of new snow sits on top of faceted snow or surface hoar. The upper snowpack is mixed: wind-affected in open areas and softer in sheltered spots, all resting on a crust from early November. Lower in the snowpack, there are several crusts, and in some areas a weak, sugary facets can be found near the ground.

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

Tuesday Night

Mostly clear skies. 20 km/h northwest ridgetop wind. Treeline temperature -7 °C.

Wednesday

Mix of sun and clouds. 1 to 5 cm of snow at treeline. 30 km/h west ridgetop wind. Treeline temperature -7 °C.

Thursday

Mix of sun and clouds. 1 to 2 cm of snow at treeline. 40 km/h west ridgetop wind. Treeline temperature -7 °C.

Friday

Mix of sun and clouds. 4 to 10 cm of snow at treeline. 40 km/h west ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction, so watch for wind slabs on all aspects.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • 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.