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Avalanche Forecast

Archived

Dec 21st, 2024–Dec 22nd, 2024

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Keep an eye out for signs of instability and continually assess conditions as you move through terrain.

Storm slabs have the potential for wide propagation due to buried weak layers.

Confidence

Moderate

Avalanche Summary

On Thursday, a skier triggered size 2 persistent slab avalanche was reported. This avalanche was on an east aspect at 2100 m. It released on the layer of surface hoar mentioned in the snowpack summary.

No other new avalanches have been reported, but observations have been limited. We expect reactive deposits of new snow will exist, particularly at upper elevations.

Snowpack Summary

Up to 15 cm of new snow may have fallen by the end of the day on the 22nd. Strong southerly winds are expected to form deeper deposits on north-facing slopes.

A crust or moist snow will be observed on the surface at lower elevations.

30 to 60 cm of snow overlies a crust on south aspects and all aspects below 1800 m from early December. A layer of surface hoar could be found just above this layer in sheltered terrain at treeline.

Snow depths at treeline are around 90 to 140 cm. You can check out a snowpack conditions update here.

Weather Summary

Saturday NightCloudy with up to 2 cm of snow. 25 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Sunday

Cloudy with 1 to 5 mm of precipitation, falling as snow above 1000 m. 30 to 60 km/h southwest ridgetop wind. Freezing level around 1500 m.

Monday

A mix of cloud and clear skies with up to 5 mm of mixed precipitation. 30 to 50 km/h south ridgetop wind. Treeline temperature -3 °C.

TuesdayCloudy with up to 5 mm of mixed precipitation. 50 to 80 km/h south ridgetop wind. Treeline temperature -2 °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.
  • Be careful as you transition into wind-affected terrain.
  • Be alert to conditions that change with aspect and elevation.
  • Be aware of the potential for large avalanches due to buried surface hoar.

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.