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Avalanche Forecast

Archived

Dec 10th, 2025–Dec 11th, 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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Purcells, South Rockies, Dogtooth, East Purcell, Bull, Elkford East, Elkford West.

Allow recent storm snow to settle and bond, and choose conservative terrain accordingly.

Confidence

Moderate

Avalanche Summary

Numerous natural, explosive, and rider-triggered avalanches were reported on Tuesday, ranging from size 1 to 2, with depths of 20 to 50 cm.

If you are out and about in the mountains, please consider posting your observations to the MIN.

Snowpack Summary

Over 50 cm of recent storm snow has accumulated in most areas by Thursday morning, accompanied by strong westerly winds.

A layer of faceted snow or surface hoar, and a crust from mid-November, is buried approximately 50 to 100 cm deep. Several crusts exist lower in the snowpack, and weak, sugary facets can be found near the ground.

Snowpack depths at treeline range from 80 to 130 cm, thinning quickly at lower elevations.

Weather Summary

Wednesday Night
Cloudy. 15 to 25 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 1400 m.

Thursday
Mostly cloudy. 3 to 4 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1500 m.

Friday
Cloudy. 2 to 10 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -6 °C. Freezing level 700 m.

Saturday
Mostly cloudy. 1 to 10 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 900 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.
  • Be especially cautious as you transition into wind-affected terrain.
  • Be aware of the potential for large avalanches due to buried surface hoar.
  • 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.