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Avalanche Forecast

Archived

Dec 14th, 2025–Dec 15th, 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 possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

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

As the new snow piles up, the likelihood of storm slabs will increase.
Dial back your exposure as the day progresses.

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

Up to 10 cm of snow in places 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 or regions that received less rain may remain crust-free.

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, but decreases quickly at lower elevations, leaving many below-treeline slopes without sufficient snow coverage to produce avalanches.

Weather Summary

Sunday Night
Cloudy with 5 to 10 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1700 m.

Monday
Cloudy with 10 to 20 mm of precipitation as snow or rain at treeline. 60 to 80 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level reaching 2200 m.

Tuesday
Mostly cloudy with 5 to 10 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1600 m.

Wednesday
Mostly cloudy with 20 to 35 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • As the storm slab problem worsens, the easy solution is to choose more conservative terrain.
  • Watch for fresh storm slabs building throughout the day.
  • Avoid freshly wind-loaded terrain features.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.