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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 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

Sasquatch, Coquihalla, Harrison-Fraser, Manning, Skagit.

Stormy weather continues, creating dangerous avalanche conditions at higher elevations.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.
  • Forecast snowfall amounts are uncertain.

Avalanche Summary

No recent avalanche activity has been directly observed in the past several days. However, a widespread avalanche cycle in neighboring regions suggests that significant natural avalanche activity has likely occurred since Tuesday.

Natural avalanche activity remains possible with continued storm snow accumulation.

Snowpack Summary

Recent storm snow continues to accumulate, with strong southerly winds, redistributing snow in alpine terrain.

A melt-freeze crust buried earlier in the week is now located approximately 40 to 80 cm below the surface at higher elevations, with wet, dense snow beneath it.

Deeper in the snowpack, a crust with facets, formed in mid-November, may exist 100 to 160 cm below the surface.

Total snowpack depths range from roughly 100 to 200 cm at higher elevations, thinning rapidly below treeline.

Weather Summary

Thursday Night
Cloudy. 10 to 20 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Friday
Cloudy. 10 to 15 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C.

Saturday
Cloudy. 15 to 30 cm of snow. 60 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Sunday
Cloudy. 5 to 15 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • Be especially cautious as you transition into wind-affected terrain.
  • Watch for fresh storm slabs building throughout the day.

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.