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Avalanche Forecast

Archived

Dec 10th, 2025–Dec 11th, 2025

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

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, Ymir, Crawford, Kokanee.

Although the natural avalanche cycle may be over, rider-triggered avalanches remain likely, especially where a supportive crust has not yet formed on the surface.

Confidence

Moderate

Avalanche Summary

Numerous storm slab avalanches, ranging from size 1 to 3, were reported on Tuesday. These occurred on all aspects and elevation bands, and were primarily triggered naturally or by explosives. A few of these avalanches stepped down to a layer of surface hoar described in the snowpack summary.

While natural avalanche activity is expected to decrease by Thursday, rider-triggered avalanches will remain likely.

Snowpack Summary

Warm, wet conditions on Wednesday night will create heavy, moist snow on the surface or a crust, depending on elevation and location. Another thin melt-freeze crust is likely just beneath the surface within recent storm snow.

A mid-November crust with facets or surface hoar above is buried 50 to 100 cm deep.

The lower snowpack is generally well settled and bonded, except in thin, rocky areas where weak basal facets may have formed.

Snowpack depth at treeline is roughly 90 to 160 cm, but tapers quickly at lower elevations, meaning many below-treeline slopes do not have the snow coverage to avalanche.

Weather Summary

Wednesday Night
Cloudy. 5 to 15 mm of a mix of snow and rain at treeline. 60 km/h west ridgetop wind. Treeline temperature 1 °C. Freezing level 2100 m.

Thursday
Mix of sun and clouds. 40 km/h west ridgetop wind, decreasing through the day. Treeline temperature -3 °C. Freezing level 1600 m.

Friday
Mostly cloudy. 1 to 2 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m, and rising through the day.

Saturday
Mostly cloudy. 1 to 2 mm of precipitation as snow or rain at treeline. 40 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.


More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Be aware of the potential for larger than expected storm slabs due to buried surface hoar.
  • Be cautious of buried obstacles, especially below treeline.

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.