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Avalanche Forecast

Archived

Dec 23rd, 2025–Dec 24th, 2025

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

Regions

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

Continually assess conditions throughout the day and watch for building wind slabs.

We have uncertainty in the forecast freezing level and precipitation amounts for Wednesday.

Confidence

Moderate

  • The snowpack structure is generally well understood.
  • Uncertainty is due to difficult to forecast freezing levels.
  • Uncertainty is due to the track & intensity of the incoming weather system.

Avalanche Summary

Loose dry natural avalanches up to size 1.5 continue to be observed in steep terrain features.

Snowpack Summary

Around 15 cm of new snow accompanied by strong southerly wind is expected by Wednesday afternoon. This falls over 40 to 70 cm of wind affected, settling snow that is generally bonding well to the mid December crust.

The mid and lower snowpack is generally well-settled but contains multiple crust layers with facets observed above.

Weather Summary

Tuesday Night

Mostly cloudy with 3 to 4 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature -5 °C. Freezing level 1100 m.

Wednesday

Cloudy with  up to 15 cm of snow at treeline and above. 50 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 2000 m.

Thursday

Mostly cloudy with 4 to 15 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.

Friday

Mostly cloudy. 20 to 50 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 900 m.

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.