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Avalanche Forecast

Archived

Dec 6th, 2024–Dec 7th, 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.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, South Okanagan, Ymir, Crawford, Kokanee.

New snow brings a welcome refresh to conditions, but it will increase danger on Saturday. Watch for shooting cracks and natural avalanches that indicate storm slabs are a problem.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported, but the new snow on Saturday may make it easier for riders to trigger avalanches.

Snowpack Summary

New snow is falling on a variety of crystals that it may not bond well to. Including surface hoar in open, sheltered terrain, suncrusts, and wind-affected snow.

The snowpack is well-settled, dense, and generally strong. A layer of buried surface hoar may be found 60 to 80 cm below the surface in some areas but hasn't produced avalanches recently.

Treeline snow depths range from 100 to 150 cm.

Weather Summary

Friday Night

Partly cloudy, increasing. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C with a temperature inversion.

Saturday

Cloudy with 5 to 10 cm of snow. 25 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C, inversion ending.

Sunday

Mostly cloudy, clearing. 20 km/h northwest ridgetop wind. Treeline temperature -7 °C.

Monday

Sunny. 20 to 30 km/h northwest ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • As the storm slab problem worsens, the easy solution is to choose more conservative 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.