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Avalanche Forecast

Archived

Dec 17th, 2025–Dec 18th, 2025

Alpine
Natural avalanches possible, human triggered probable.
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 Inland, Kitimat, Nass, Rupert, Seven Sisters, Shames, Howson.

New snow and wind are keeping the avalanche hazard elevated.

Use small slopes to see how the new snow is bonding, travel in avalanche terrain one at a time, and watch for signs of instability.

Confidence

Moderate

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

Avalanche Summary

Reports of a natural avalanche cycle up to size 2.5 on Monday and Tuesday consisting of storm slabs at upper elevations, with wet loose avalanches at lower elevations.

A few small (size 1) human triggered avalanches were reported on Tuesday, not running far or fast.

Snowpack Summary

About 30 cm of snow is on the surface in sheltered areas and is wind affected in the alpine and open areas at treeline.

A crust is present at elevations lower than 1300 m and is buried 30cm deep.

A few layers of weak, feathery surface hoar crystals can be found between 50 to 150 cm deep.

Snowpack depths in excess of 300 cm can be found at treeline elevations.

Have a read of this MIN for details specific to the Shames area

Weather Summary

Wednesday
Cloudy. 5 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Thursday
Mostly cloudy. 5 cm of snow. 10 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Friday
Mostly cloudy. up to 5 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature -6 °C.

Saturday
Mostly cloudy. 5 cm of snow. 10 km/h southeast ridgetop wind. Treeline temperature -14 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Keep in mind that human triggering may persist as natural avalanches taper off.
  • Make observations and continually assess conditions as you travel.
  • A hard crust on the snow surface will help strengthen the snowpack, but may cause tough travel conditions.

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.