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Avalanche Forecast

Archived

Dec 16th, 2025–Dec 17th, 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 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.

Regions

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

The ongoing snowfall is expected to build new storm slabs, especially in terrain impacted by the wind. Continue to make conservative terrain choices and given the new snow time to stabilize.

Confidence

Low

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

Avalanche Summary

On Sunday and Monday, numerous wind slab avalanches up to size 2.5 were observed in the alpine and at treeline, primarily on north aspects. A few storm slab avalanches were also observed on Monday at lower elevations, likely triggered by the rain and warming. Two glide slab avalanches were also observed, triggered by the rain.

Snowpack Summary

Rainfall on Monday formed a new melt-freeze crust which extends to at least 2000 m. As tempertures dropped overnight, the precipitation switched to snow and up to 25 cm of new snow now overlies this new crust. Ongoing wind is redistributing the new snowfall building new wind slabs in exposed terrain.

Around 100 cm deep, a layer of surface hoar, facets and/or a crust exists. Uncertainty exists over the reactivity of this layer. In thin snowpack areas, faceted grains or depth hoar may exist at the base of the snowpack.

Weather Summary

Tuesday Night
Mostly cloudy. 2 to 15 cm of snow. 30 km/h southeast ridgetop wind. Treeline temperature -9 °C.

Wednesday
Mostly cloudy. 5 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -18 °C.

Thursday
Mostly cloudy. 10 to 15 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Friday
Mix of sun and clouds. 0 to 2 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -20 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.

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.