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Avalanche Forecast

Archived

Dec 18th, 2025–Dec 19th, 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 possible, human triggered probable.
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, Kokanee, Retallack, Valhalla, Whatshan.

Storm slabs remain reactive to human triggers, especially in wind affected terrain.

Continue to make conservative terrain choices while the storm snow settles and stabilizes.

Confidence

Moderate

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

Avalanche Summary

On Wednesday, numerous explosive triggered storm slab avalanches up to size 2 were reported at all elevations on a variety of aspects.

Snowpack Summary

20 to 30 cm of recent 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

Thursday Night
Cloudy. 5 to 15 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1500 m.

Friday
Mostly cloudy. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level 1300 m.

Saturday
Mostly cloudy with flurries. 3 to 10 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level 1000 m.

Sunday
Mostly cloudy with isolated flurries. 0 to 5 cm of snow. 35 km/h south ridgetop wind. Treeline temperature -6 °C. Freezing level 1000 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.