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Avalanche Forecast

Archived

Dec 3rd, 2025–Dec 4th, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead, Akamina, Flathead, Lizard, Crawford, Moyie, St. Mary.

New snow and strong upper-elevation winds may form fresh wind slabs that a person could trigger.

Assess steep slopes for dense or stiff snow before committing.

Confidence

Low

Avalanche Summary

No new reports on Wednesday.

On Tuesday, wind slabs up to size 2 were reactive to rider triggering.

Rider-triggered wind slabs remain possible at upper elevations for Thursday.

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

Snowpack Summary

At treeline and above, 8–12 cm of new snow sits on top of faceted snow or surface hoar. The upper snowpack is mixed: wind-affected in open areas and softer in sheltered spots, all sitting on the mid-November crust buried 30–50 cm deep. Lower in the snowpack, there are several crusts, and in some areas a weak, sugary facets can be found near the ground.

Total snowpack depths are roughly 80 to 120 cm, tapering quickly at lower elevations.

In many areas, especially below treeline, there is not enough snow to smooth out surface roughness or reach the threshold needed for avalanches.

Weather Summary

Wednesday Night
Cloudy. 2 to 4 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -5 °C.

Thursday
Cloudy. Up to 5 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -5 °C.

Friday
Mostly cloudy. 3 to 10 cm of snow. 20 km/h west ridgetop wind. Treeline temperature -6 °C.

Saturday
Mostly cloudy. 2 to 5 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Approach lee and cross-loaded slopes with caution.
  • Be cautious of buried obstacles, especially below treeline.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.