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Avalanche Forecast

Archived

Dec 18th, 2025–Dec 19th, 2025

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

Regions

South Columbia, Esplanade, Jordan, North Selkirk, Dogtooth, West Purcell, Badshot-Battle, Central Selkirk, Goat, Gold.

Storm snow continues to accumulate over a crust, creating dangerous avalanche conditions.

Avoid avalanche terrain, stick to low angle and back off if you see signs of instability.

Confidence

Moderate

  • Uncertainty is due to how quickly the snowpack will recover and gain strength.

Avalanche Summary

Numerous storm slab avalanches were reported near Revelstoke on Thursday involving the new storm snow.

On Wednesday several large storm slab avalanches were reported both human and explosive triggered. Mostly running on the most recent crust.

With continued accumulation of storm snow we expect storm slabs to be reactive to natural and human triggers.

Snowpack Summary

Roughly 20 to 25 cm of new storm snow brings recent storm snow totals to 40 to 60 cm.

The accumulated new snow overlies a crust that formed as temperatures cooled following this week's significant warming event and extends to roughly 2300 m. Numerous storm slab avalanches have released down to this crust.

We continue to track two layers in the mid and lower snowpack. The reactivity of these layers, now buried more than 150 cm deep, is uncertain. Triggering these layers is more likely in high alpine terrain where no supportive crust is present.

Weather Summary

Thursday Night
Cloudy. 15 to 20 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Friday
Mostly cloudy. 2 to 5 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -9 °C.

Saturday
Mostly cloudy. 10 to 20 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -8 °C.

Sunday
Mostly cloudy. 3 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Don't let storm day fever lure you into consequential 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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.