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Avalanche Forecast

Archived

Dec 24th, 2025–Dec 25th, 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 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.

New snow & wind may build new storm slabs overnight.

If you see more than 20 cm of new snow in your area, hazard is CONSIDERABLE and storm slabs may be more reactive than expected.

Confidence

Moderate

  • Forecast snowfall amounts are uncertain.
  • The snowpack structure is generally well understood.

Avalanche Summary

On Tuesday, ski cuts resulted in some small size 1 wind slabs near Whitewater.

On Monday, Loose dry natural avalanches up to size 1.5 were observed in steep terrain features.

Looking forward, we expect storm slabs may be possible to trigger at upper elevations on Thursday, especially on wind-loaded aspects.

Snowpack Summary

5 to 15 cm of new snow fell in the region on Wednesday, and another 5 to 15 is expected by Thursday afternoon.

The mid December crust is down 40 to 70 cm, seems well bonded, and is not concerning at this time.

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

Weather Summary

Wednesday Night
Cloudy. 2 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 2000 m dropping to 1400 m.

Thursday
Cloudy. 2 to 5 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1400 m.

Friday
Cloudy. 15 to 25 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1400 m.

Saturday
Sunny. 5 to 10 cm of snow Friday night. 30 km/h northwest ridgetop wind. Treeline temperature -15 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Approach lee and cross-loaded slopes with caution.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.