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Avalanche Forecast

Archived

Dec 8th, 2025–Dec 9th, 2025

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

Sea To Sky, Brandywine, Garibaldi, Homathko, Powell River, Spearhead, Tantalus, Sky Pilot.

The storm is expected to taper off Monday night, resulting in variable snowpack conditions.
Expect significant changes as you travel through different elevations

Confidence

Moderate

Avalanche Summary

Several explosive and human-triggered avalanches were reported in the Whistler/Blackcomb area over the last few days. These storm slabs ranged from size 1 to 2.5, with some stepping down to deeper buried layers like the Mid-November crust up to 1 m deep.

If you're heading out into the backcountry, please consider sharing your observations on the MIN.

Snowpack Summary

Up to 50 mm of precipitation fell as rain at lower elevations. Uncertainty is related to the amount of new snow at upper elevations, with elevated freezing levels expected Monday night.

This new snow will add to previous storm slabs that have formed over the last few days, which currently overlie older layers such as surface hoar, facets, and crusts.

A hard mid-November crust currently sits 50 to 100 cm deep with facets above and below. Some recent storm slabs have stepped down to this layer.

The snow surface at treeline is likely wet and diminishes rapidly with elevation below 1100 m.

Weather Summary

Monday Night
Cloudy. 10 to 15 cm of snow at treeline. 50 km/h southwest ridgetop wind. Treeline temperature +2 °C. Freezing level at 2200 m lowering to 1500 m.

Tuesday
Partially cloudy. 30 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 1300 m.

Wednesday
Cloudy. 15 to 25 mm of precipitation as snow or rain at treeline. 40 km/h west ridgetop wind. Treeline temperature 0°C. Freezing level rising to 1800 m.

Thursday
Mostly cloudy. 30 km/h northwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Loose avalanches may start small, but they can grow and push you into dangerous terrain.
  • Watch for rapidly changing conditions during periods of heavy loading from new snow, wind, or rain.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.