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Avalanche Forecast

Archived

Dec 11th, 2025–Dec 12th, 2025

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Up to 20 cm of new snow & strong winds is forecast above 2000 m, falling as rain at lower elevations.

Wind slabs may form in leeward terrain if there is dry snow available to blow.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been reported, but observations are very limited in this region.

If you're heading out into the backcountry, please consider sharing your observations on the MIN.

Snowpack Summary

Up to 70 mm of precipitation has fallen since Wednesday, primarily as rain, with freezing levels rising well into the alpine. With cooling temperatures, this has likely formed a widespread surface crust. 10 to 20 cm of snow is forecast to fall overnight and through Friday, hopefully improving riding conditions in the alpine. The new snow will be accompanied by strong westerly winds, likely forming fresh wind slabs in leeward terrain.

Total snowpack depths range from around 80 to 150 cm deep at treeline, and diminish rapidly below 1500 m.

Weather Summary

Thursday Night
Cloudy. 5 to 10 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level dropping to 1200 m.

Friday
Cloudy. 5 mm of rain at treeline. 50 km/h southwest ridgetop wind. Treeline temperature 1 °C. Freezing level rising to 2000 m.

Saturday
Mostly cloudy. 10 mm of rain at treeline. 50 km/h southwest ridgetop wind. Treeline temperature 2 °C. Freezing level 2200 m.

Sunday
Cloudy. 25 to 35 mm of rain at treeline. 60 km/h southwest ridgetop wind. Treeline temperature 1 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Wind slabs are most reactive during their formation.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.