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Avalanche Forecast

Archived

Dec 11th, 2025–Dec 12th, 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 unlikely, human triggered possible.

Regions

North Columbia, South Columbia, Esplanade, Jordan, North Selkirk, West Purcell, Badshot-Battle, Central Selkirk, Goat, Gold, Retallack, Valhalla, Whatshan.

Buried weak layers will likely cause dangerous avalanche conditions to persist.

Avoid travelling under large slopes.

Confidence

High

Avalanche Summary

The avalanche cycle continued on Wednesday, with many large storm and persistent slab avalanches failing deep within the snowpack, either below the storm snow or on the crust from November. The larger avalanches (size 3-3.5) were running from the alpine and well below treeline.

Snowpack Summary

50 to 100 cm of snow has fallen this week over a weak surface hoar layer and/or weak faceted snow. Surface hoar is most likely in tree openings sheltered from the wind, whereas faceted snow may be found in wind-exposed terrain into the alpine. Facets may be associated with a hard melt-freeze crust that formed in the middle of November. This layer has recently produced large avalanches.

Weather Summary

Thursday Night
Mostly cloudy with 2 to 5 cm of snow. 20 km/h west ridgetop wind. Treeline temperature -7 °C.

Friday
Cloudy with 10 to 15 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -6 °C.

Saturday
Mostly cloudy with 5 to 15 cm of snow. 20 to 50 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level rising to 2500 m.

Sunday
Cloudy with 15 to 25 mm of precipitation as snow or rain at treeline. 40 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Remote triggering is a concern; avoid terrain where triggering overhead slopes is possible.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.