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Avalanche Forecast

Archived

Dec 18th, 2025–Dec 19th, 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.

Areas where the surface or near surface snow has been affected by the wind are most likely to be a concern.

Consider the hazard to be increasing if you see wind moving snow into lee features.

Confidence

Moderate

  • Uncertainty is due to limitations in the field data.

Avalanche Summary

  • On Wednesday explosive avalanche control produced small (up to size 1.5) wind slab avalanches at treeline.

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

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

Thursday Night
Mostly clear skies. 10 km/h northeast ridgetop wind. Treeline temperature -17 °C.

Friday
Mix of sun and clouds. 1 cm of snow. 10 km/h east ridgetop wind. Treeline temperature -18 °C.

Saturday
Mostly sunny. 10 km/h east ridgetop wind. Treeline temperature -20 °C.

Sunday
Mix of sun and clouds. 1 cm of snow. 10 km/h east ridgetop wind. Treeline temperature -21 °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.