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Avalanche Forecast

Archived

Dec 16th, 2025–Dec 17th, 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 Coastal, Boundary, Stewart, Ningunsaw, Ningunsaw, Ningunsaw.

Recent snow will take time to stabilize.

As you travel check the bond of the new snow to the old surface. Back down if you encounter signs of instability.

Confidence

Moderate

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 new 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

Tuesday Night
Mostly cloudy. 5 cm of snow. 20 km/h east ridgetop wind. Treeline temperature -6 °C.

Wednesday
Mostly cloudy. 5 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -9 °C.

Thursday
Mostly cloudy. 5 cm of snow. 10 km/h variable ridgetop wind. Treeline temperature -12 °C.

Friday
Partly cloudy. 1 cm of snow. 10 km/h east ridgetop wind. Treeline temperature -18 °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.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.

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.