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Avalanche Forecast

Archived

Dec 29th, 2025–Dec 30th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

High freezing levels, clear skies and unconsolidated snow are a perfect recipe for a widespread wet loose avalanche problem.

Avoid steep slopes and exposure to overhead hazards.

Confidence

Moderate

  • Uncertainty is due to rapidly fluctuating freezing levels.

Avalanche Summary

Several human triggered avalanches size 1 to 1.5 were reported on Sunday off the Coquihalla in the Zoa area. A larger size 2 wind slab was human triggered on a cross loaded feature at treeline.

Human triggered avalanches within the upper snowpack are expected to continue and spike as the freezing levels rise and skies clear.

Snowpack Summary

High freezing levels and clear skies are impacting the surface snow and upper snowpack. Moist surface snow overlies settling and wind affected storm snow from last week.

A soft layer of snow may be preserved between the moist surface snow and the 130 cm mid/lower snowpack that sits over the December 16th melt-freeze crust.

Weather Summary

Monday Night
Clear skies. 20 km/h west ridgetop wind. Treeline temperature 1 °C. Freezing level 2600 m.

Tuesday
Mostly sunny. 30 km/h southwest ridgetop wind. Treeline temperature 4 °C. Freezing level 3000 m.

Wednesday
Mostly sunny. 30 km/h southwest ridgetop wind. Treeline temperature 3 °C. Freezing level 2700 m.

Thursday
Mix of sun and clouds. 20 km/h southwest ridgetop wind. Treeline temperature 2 °C. Freezing level 2400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Rocks will heat up with daytime warming and may become trigger points for loose wet avalanches.
  • Keep in mind that the high density of wet avalanches can make them destructive.
  • Wind slabs are isolated, but may remain reactive.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.