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Avalanche Forecast

Archived

Dec 17th, 2025–Dec 18th, 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

Northwest Coastal, Boundary, Stewart, Ningunsaw.

With lots of soft snow on the surface, consider the hazard to be increasing if you see wind starting to move the snow into lee features.

Back down if you encounter signs of instability.

Confidence

Moderate

  • Uncertainty is due to limitations in the field data.

Avalanche Summary

  • On Monday explosive avalanche control produced large avalanches (up to size 2.5) and also noted sympathetic avalanches.

  • Natural, large (up to size 3) slab avalanches were reported over the weekend.

Snowpack Summary

30 to 70 cm of recent snow was accompanied by strong wind. In sheltered areas, the snow may rest on a weak layer of surface hoar.

The mid and lower snowpack are uncomplicated and relatively deep for the time of year. Snowpack depths in excess of 300 cm can be found at treeline elevations.

Weather Summary

Wednesday Night
Mostly cloudy. 5 cm of snow. 10 km/h southwest ridgetop wind. Treeline temperature -9 °C.

Thursday
Mostly cloudy. 2 to 4 cm of snow. 10 km/h variable ridgetop wind. Treeline temperature -12 °C.

Friday
Partly cloudy. 1 cm of snow. 10 km/h northeast ridgetop wind. Treeline temperature -18 °C.

Saturday
Partly cloudy. 1cm of snow. 10 km/h east ridgetop wind. Treeline temperature -20 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep in mind that human triggering may persist as natural avalanches taper off.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.

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.