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Avalanche Forecast

Archived

Dec 22nd, 2025–Dec 23rd, 2025

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

Regions

Kootenay Boundary, Purcells, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, Ymir, Crawford, Kokanee, Retallack, Valhalla, Whatshan.

Conditions will change with elevation and wind exposure. Reactive slabs remain a concern in wind-loaded features, but sheltered terrain holds great riding conditions.

Confidence

Moderate

  • The snowpack structure is generally well understood.
  • Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Avalanche Summary

On Sunday, loose dry natural avalanches were observed up to size 1.5 from steep terrain features. Explosives triggered slab avalanches to size 1.5.

Moving forward, expect slab reactivity in wind-loaded terrain features, with loose sluffing on steep, sheltered slopes.

Snowpack Summary

Up to 15 cm of new snow is expected by Tuesday morning. This falls over 40-60 cm of wind affected, settling snow that is generally bonding well to the crust below.

The mid and lower snowpack is generally well-settled and contains multiple crust layers.

Weather Summary

Monday Night
Cloudy. 5 to 15 cm of snow. Highest amounts are expected in the north, near London Ridge. 50 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level 1200 m.

Tuesday
Mix of sun and clouds. 20 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level 1100 m.

Wednesday
Mostly cloudy. 10 to 40 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 800 m.

Thursday
Mostly cloudy. 3 to 5 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Approach lee and cross-loaded slopes with caution.

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.