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Avalanche Forecast

Archived

Dec 11th, 2025–Dec 12th, 2025

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

Regions

North Rockies, East Kakwa, Kakwa, McGregor, Pine Pass, Tumbler.

Buried weak layers need time to adjust to the new snow load.
Gather info in simple terrain, free from overhead slopes, before increasing your exposure.

Confidence

Low

Avalanche Summary

Stormy conditions have limited avalanche observations, but we suspect that natural avalanches were releasing during periods of heavy snow loading on Wednesday. Natural avalanche activity is expected to have slowed after the storm with the temperature dropping. Riders may still trigger avalanches.

Snowpack Summary

Up to 80 cm of light, dry snow has fallen this week. In the middle of the snowpack is a layer of surface hoar and/or faceted grains. The layer of facets may have a hard melt-freeze crust underneath. It's uncertain whether this layer will be a concern going forward. In thin snowpack areas, faceted grains may extend to the ground.

Average snow depths at treeline range from 100 to 170 cm and decrease rapidly at lower elevations.

Weather Summary

Thursday Night
Partly cloudy. 20 km/h west ridgetop wind. Treeline temperature -16 °C.

Friday
Mix of sun and clouds. 30 km/h west ridgetop wind. Treeline temperature -15 °C.

Saturday
Mostly cloudy with 10 to 20 cm of snow . 50 to 80 km/h southwest ridgetop wind. Treeline temperature -9 °C.

Sunday
Mostly cloudy with 10 to 15 cm of snow. 50 to 70 km/h southwest ridgetop wind. Treeline temperature -6 °C.


More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid slopes that sound hollow or drum-like.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

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.