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Avalanche Forecast

Archived

Dec 4th, 2025–Dec 5th, 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.

Fresh snow and strong winds may form reactive wind slabs.

Assess steep slopes for dense or stiff snow before committing.

Confidence

Low

Avalanche Summary

Early this week (Tuesday), wind slabs up to size 2 were reactive to rider triggering.

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

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

Thursday Night
Mostly cloudy. 15 to 25 km/h west ridgetop wind. Treeline temperature -10 °C.

Friday
Cloudy. 3 to 8 cm of snow. 20 to 40 km/h west ridgetop wind. Treeline temperature -7 °C.

Saturday
Cloudy. 2 to 7 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Sunday
Mostly cloudy. Up to 5 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -5 °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.