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Avalanche Forecast

Archived

Dec 8th, 2025–Dec 9th, 2025

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
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.

Regions

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

Keep your stoke in check as skies clear! Storm snow sits over a weak lower snowpack.

Avoid exposure to avalanche terrain, natural & human triggered avalanches are likely.

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 Tuesday morning, storm totals are expected to reach 60-100 cm. Higher elevations are likely heavily wind affected, with deep and reactive deposits. Snow at lower elevations is likely moist from rain or mixed precipitation.

A layer of faceted snow or surface hoar exists below the recent storm snow. A crust from mid-November is buried 70-100 cm deep. Several additional crusts can be found in the lower snowpack, and in some areas, weak, sugary facets can be found near the ground.

Snowpack depths range from 90–160 cm and thin rapidly at lower elevations. Many slopes at treeline and below are expected to reach threshold for avalanche activity with this storm.

Weather Summary

Monday Night
Mostly cloudy. 10 to 20 mm of precipitation as snow or rain at treeline. 60 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 1700 m.

Tuesday
Mostly clear skies. 30 km/h west ridgetop wind. Treeline temperature -5 °C. Freezing level 1500 m.

Wednesday
Mostly cloudy. 10 to 25 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1300 m.

Thursday
Mostly cloudy. 1 to 5 mm of precipitation as snow or rain at treeline. 30 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1800 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.
  • Don't let storm day fever lure you into consequential 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.