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Avalanche Forecast

Archived

Dec 10th, 2025–Dec 11th, 2025

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

Regions

Banff Yoho Kootenay, Little Yoho, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

A widespread avalanche cycle continues across the region; avoid avalanche terrain again on Thursday. Great snow quality can be found in the trees. Mt Field and Mt Whymper are both closed all day on Thursday as avalanche control operations will be underway. More snow again on Friday and Saturday.

Confidence

High

Avalanche Summary

Many avalanches were observed from avalanche control across BC and Alberta yesterday and today, with avalanche control operations continuing on Thursday. Backcountry observations have been limited due to the storm, but avalanches up to size 3 have been triggered in numerous locations.

Snowpack Summary

Another 15 cm of snow in the past 24-hours brings the 6-day storm total to 40 cm on the east side of the range, and 70 cm to the west. LOTS of storm snow has been blown into widespread, reactive wind and storm slabs. Several crusts exist in the mid-snowpack, and avalanches are likely failing on those right now too.

Weather Summary

The storm track continues to pump moisture across the area:

Wednesday Night: 10 to 15 cm of snow. 50 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 1200 m.

Thursday: Mostly sunny. 30 km/h west ridgetop wind. Treeline temperature -6 °C. Freezing level 700 m.

Friday: Mix of sun and clouds. 2 to 5 cm of snow. 20 km/h west ridgetop wind. Treeline temperature -9 °C. Freezing level 0 m.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Watch for fresh storm slabs building throughout the day.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.