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Avalanche Forecast

Archived

Dec 1st, 2025–Dec 2nd, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Snowfall amounts are uncertain.

If you're seeing more than 10 cm of new snow, storm slabs are possible.

New snow is unlikely to stick to the old snow.

Confidence

Low

Avalanche Summary

No avalanches have been reported. However, observations are limited.

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

Snowpack Summary

Ongoing light snowfall may not bond well to old snow crystals, including: surface hoar, sugary facets, and sun crusts. It's estimated that anywhere from 5 to 15 cm of new snow could cover this layer by the end of the day on Tuesday.

Above treeline, there is a buried crust down 30 to 40 cm, which extends to the ground. The snowpack is around 70 to 90 cm deep at treeline, and shrinks rapidly below treeline.

In wind exposed areas, soft snow has likely been redistributed into lee features.

Weather Summary

Monday Night
Cloudy with 5 to 10 cm of snow. 20 to 40 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 900 m.

Tuesday
Mostly cloudy with 3 cm of snow. 20 to 30 km/h west to north ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m.

Wednesday
Mostly cloudy with 1 to 2 cm of snow. 20 to 40 km/h west ridgetop wind. Treeline temperature -3 °C.

Thursday

Mostly cloudy. 10 to 15 cm of snow at treeline. 40 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • As the storm slab problem worsens, the easy solution is to choose more conservative terrain.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Be cautious of buried obstacles, especially below treeline.

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.