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Avalanche Forecast

Archived

Dec 20th, 2025–Dec 21st, 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 possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Vancouver Island, East Island, North Island, South Island, West Island.

Ongoing snowfall continues to rapidly build the snowpack across the region, creating a widespread storm slab problem. Choose terrain carefully.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.
  • Forecast precipitation (either snow or rain) amounts are uncertain.

Avalanche Summary

No avalanches have been reported; however, natural avalanche activity is likely ongoing during periods of rapid loading from heavy snow and/or wind transport. Avalanche activity is most likely in alpine and treeline terrain, where previous snow coverage provides a smooth bed surface for avalanches.

We look forward to your MIN reports from checking out the snow!

Snowpack Summary

Snow continues to accumulate throughout the region, with many areas seeing the snowpack more than double in depth since the beginning of the week. Up to 100 cm of recent snow has fallen in areas, with deeper deposits in wind-loaded terrain at treeline and above.

Below the recent snow lies a melt-freeze crust over previously rain-saturated snow.

Early-season hazards remain a concern, now concealed beneath the new snow, and will continue to be until the snowpack settles into a more supportive surface or additional snowfall provides deeper coverage.

Weather Summary

Saturday Night
Cloudy. 5 to 10 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 900 m.

Sunday
Cloudy. 15 to 25 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Monday
Cloudy. 15 to 45 cm of snow. 40 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Tuesday
Cloudy. 10 to 30 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • As the storm slab problem worsens, the easy solution is to choose more conservative terrain.
  • Be especially cautious as you transition into wind-affected terrain.

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.