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Avalanche Forecast

Archived

Dec 20th, 2025–Dec 21st, 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.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland, Kitimat, Nass, Rupert, Seven Sisters, Shames, Howson.

Avoid steep slopes with areas of dense, wind-blown snow.

Shifting winds may build wind slabs in unusual places - Don't get caught off guard!

Confidence

Moderate

  • Uncertainty is due to how quickly the snowpack will recover and gain strength.

Avalanche Summary

No new avalanches have been reported.

On the 17th, a small size 1 wind slab was ski cut on a north aspect at treeline.

On the 16th, some naturally triggered storm slabs up to size 1.5 were observed.

With limited observations available this time of year, it’s a good idea to continually verify conditions and adjust your plans as you travel.

If you are heading into the backcountry, consider sharing your observations on the Mountain Information Network.

Snowpack Summary

Alpine and open treeline areas have seen significant wind effect and wind slabs building from outflow northeasterly winds.

Up to 50 cm of storm snow from last week sits on a thin crust with facets below, which extends up to 1400 m.

Several layers of weak surface hoar can be found between 70 to 200 cm deep. Triggering these layers is considered unlikely at this time.

Snowpack depths in excess of 350 cm can be found at treeline elevations.

Weather Summary

Saturday Night
Partly cloudy. 30 km/h variable ridgetop wind. Treeline temperature -12 °C.

Sunday
Mostly sunny. 25 km/h northeast ridgetop wind. Treeline temperature -13°C.

Monday
Mix of sun and clouds. 35 km/h east ridgetop wind. Treeline temperature -19 °C. Possible temperature inversion forming in the alpine.

Tuesday
Mix of sun and clouds. 1 to 4 cm of snow. 40 km/h variable ridgetop wind. Treeline temperature -17 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction, so watch for wind slabs on all aspects.
  • Be especially cautious as you transition into wind-affected terrain.
  • Use ridges or ribs to avoid areas of wind-loaded snow.

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.