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Avalanche Forecast

Archived

Dec 15th, 2025–Dec 16th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
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.

Regions

Northwest Coastal, Boundary, Stewart, Ningunsaw, Ningunsaw, Ningunsaw.

The new 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

Natural, large ( up to size 3 ) slab avalanches have been observed over the weekend.

Explosive avalanche control also noted sympathetic avalanches.

Once the storm clears, we are expecting to see more evidence of a widespread natural avalanche cycle.

Snowpack Summary

30 to 50 cm of new snow fell this weekend with 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

Monday Night
Cloudy. 5 to 10 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -6 °C.

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

Wednesday
Mostly cloudy. 5 to 10 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature -9 °C.

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