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Avalanche Forecast

Archived

Dec 17th, 2025–Dec 18th, 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.

Regions

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

Up to 30 cm of new snow and southwest winds have formed fresh storm slabs that will be most reactive in wind affected terrain.

Make conservative terrain choices and avoid overhead hazard.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.

Avalanche Summary

On Tuesday, numerous natural and explosive triggered storm slab avalanches up to size 2 were reported at all aspects and elevations.

Snowpack Summary

20 to 30 cm of new snow and strong southwest winds have formed slabs overlying a thick crust.

Below the crust, the snowpack is likely moist to the ground.

Weather Summary

Wednesday Night
Partly cloudy. 40 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level 900 m.

Thursday
Cloudy. 10 to 20 cm of snow. 40 km/h south ridgetop wind. Treeline temperature -7 °C. Freezing level 900 m.

Friday
Mix of sun and clouds. 30 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1100 m.

Saturday
Mostly cloudy with isolated flurries. 0-5 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level 700 m.



More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Closely monitor how the new snow is bonding to the crust.

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.