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Avalanche Forecast

Archived

Dec 17th, 2025–Dec 18th, 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

Lizard-Flathead, Akamina, Flathead, Lizard, Moyie.

Up to 70 cm of new snow and west winds have formed fresh storm slabs that will be most reactive in wind affected terrain.

Make conservative terrain choices and avoid overhead hazard.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.

Avalanche Summary

On Wednesday, numerous explosive triggered storm slab avalanches up to size 2 were reported primarily at treeline and above on a variety of aspects.

Strong southwest winds on Thursday could trigger natural avalanches on lee aspects.

Snowpack Summary

50-70 cm of new snow and strong west winds have formed slabs overlying a thick crust.

Below the crust, the snowpack is moist to the ground.

Weather Summary

Wednesday Night
Partly cloudy. 50 km/h west ridgetop wind. Treeline temperature -8 °C. Freezing level valley bottom.

Thursday
Cloudy. 5 to 15 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level 1200 m.

Friday
Mostly cloudy. 50 km/h west ridgetop wind. Treeline temperature -5 °C. Freezing level 1600 m, dropping to valley bottom.

Saturday
Mostly cloudy. 3 to 10 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level valley bottom.


More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Closely monitor how the new snow is bonding to the crust.

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.