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Avalanche Forecast

Archived

Dec 15th, 2025–Dec 16th, 2025

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

Regions

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

As you climb above the rain crust, start thinking about possible storm slabs.
Lee areas are best avoided.

Confidence

Moderate

Avalanche Summary

A few small storm slabs were triggered on Saturday. They ran on the new crust that's just below the surface.

Snowpack Summary

The snowline seems to have been around 2000 m on Monday. Where it snowed, 10 to 15 cm has buried a widespread melt–freeze crust. Beneath this crust, the snow remains moist due to the recent warm and wet weather. Some alpine areas may remain crust-free, while treeline and down is likely rain soaked with a new crust on top.

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.

Weather Summary

Monday Night
Partly cloudy with 2 mm of precipitation as snow or rain at treeline. 40 to 60 km/h west ridgetop wind. Treeline temperature -5 °C. Freezing level 1500 m.

Tuesday
Mostly cloudy with 5 to 10 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1300 m.

Wednesday
Mostly cloudy with 25 to 35 cm of snow. 40 to 60 km/h west ridgetop wind. Treeline temperature -5 °C. Freezing level 1300 m.

Thursday
Mostly cloudy with 5 to 10 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind-loaded terrain features.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

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.