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Avalanche Forecast

Archived

Dec 27th, 2025–Dec 28th, 2025

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Cold temperatures may keep wind slabs reactive to human triggering.

Actively look for signs of instability like shooting cracks and don't commit to steep slopes if the snow feels dense.

Confidence

Moderate

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

Avalanche Summary

Several size 1 to 1.5 storm slab avalanches were reported on Friday. These avalanches appear to have failed within the upper snowpack and may be the result of recent moderate to strong winds.

Cold temperatures may keep storm slabs reactive to human triggers on Sunday.

Snowpack Summary

Recent low-density storm snow has been redistributed by moderate westerly wind, developing wind slabs at upper elevations.

Consecutive storms have accumulated up to 130 cm of settling snow over a crust formed during the warm-up and buried on December 16th.

Snow depths at treeline range widely, from 100 to 300 cm as a result of wind redistribution.

Weather Summary

Saturday Night
Mostly clear skies. 30 km/h west ridgetop wind. Treeline temperature -11 °C.

Sunday
Mostly cloudy. 1 to 2 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -8 °C.

Monday
Mostly cloudy. 1 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -3 °C.

Tuesday
Mix of sun and clouds. 40 km/h southwest ridgetop wind. Treeline temperature 3 °C.
Freezing level 2500 m.

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.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.

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.