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Avalanche Forecast

Archived

Dec 12th, 2025–Dec 13th, 2025

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

Although a supportive surface crust reduces the likelihood of triggering an avalanche, use caution anywhere the crust does not exist or is thin and weak.

Confidence

Moderate

Avalanche Summary

No new avalanche activity has been reported since the recent warm and wet storm.

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.

Snowpack Summary

Trace amounts of new snow are accumulating over a widespread melt–freeze crust, which varies in thickness and strength with elevation. Beneath this crust, the snow remains moist due to the recent warm and wet weather. Some alpine areas may remain crust-free.

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

The lower snowpack is generally well settled and bonded.

Snowpack depth at treeline ranges from roughly 90 to 160 cm, but decreases quickly at lower elevations, leaving many below-treeline slopes without sufficient snow coverage to produce avalanches.

Weather Summary

Friday Night
Cloudy. 4 to 5 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1400 m.

Saturday
Cloudy. 1 to 3 mm of precipitation as snow or rain at treeline. 30 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 2000 m.

Sunday
Mostly cloudy. 1 to 4 mm of precipitation as snow or rain at treeline. 50 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 2100 m.

Monday
Cloudy. 25 to 40 mm of precipitation as snow or rain at treeline. 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • A hard crust on the snow surface will help strengthen the snowpack, but may cause tough travel conditions.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.

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.