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Avalanche Forecast

Archived

Dec 7th, 2025–Dec 8th, 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 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.

Regions

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

Heads up - winter has hit the Kootenays!

Reactive storm slabs will form as wind and snow continue throughout the day. Step back into conservative terrain if you notice signs of instability.

Confidence

Moderate

Avalanche Summary

We expect storm slabs to be reactive to natural and human triggers.

If you are out and about in the mountains, please consider posting your observations to the MIN.

Snowpack Summary

By Monday afternoon, up to 35 cm of new snow is expected - bringing recent storm totals to 40-70 cm.

A layer of faceted snow or surface hoar exists below the recent storm snow. A crust from mid-November is buried 50-70 cm. Several additional crusts can be found in the lower snowpack, and in some areas, weak, sugary facets can be found near the ground.

Many slopes at treeline and below are expected to reach threshold for avalanche activity with this storm.

Weather Summary

Sunday Night
Cloudy. 3-5 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 1300 m.

Monday
Cloudy. 25-35 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1300 m.

Tuesday
Mix of sun and clouds. 3-15 mm of precipitation as snow or rain at treeline in the morning. Skies begin to clear in the afternoon. 40 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1800-2100 m.

Wednesday
Mostly cloudy. 5-15 mm of precipitation as snow or rain at treeline. 20-40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • As the storm slab problem worsens, the easy solution is to choose more conservative terrain.
  • 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.