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Avalanche Forecast

Archived

Dec 21st, 2025–Dec 22nd, 2025

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

Regions

Lizard-Flathead, Akamina, Flathead, Lizard, Moyie, Crowsnest South.

Watch for changing conditions as you shift elevation and aspect - wind affected features may remain reactive to human triggers.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.
  • Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Avalanche Summary

On Saturday, wind slabs to size 2 were exposively triggered on north and easterly aspects at treeline and above.

Snowpack Summary

50 to 70 cm of recent snow combined with strong southwest winds have formed slabs overlying a 5 to 20 cm thick crust.

Below the crust, the snowpack is generally well settled and moist to the ground in most areas.

Weather Summary

Sunday Night
Mostly cloudy. 5 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level 400 m.

Monday
Mostly cloudy. 1 to 2 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level 1000 m.

Tuesday
Mostly cloudy. 1 to 5 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1100 m.

Wednesday
Mostly cloudy. 10 to 20 cm of snow. 40 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Closely monitor how the new snow is bonding to the crust.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

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.