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Avalanche Forecast

Archived

Nov 29th, 2024–Nov 30th, 2024

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

Regions

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

Travel with caution around steep wind-affected slopes.

Confidence

Moderate

Avalanche Summary

No human-triggered avalanches have been reported since the weekend, but explosives have triggered several size 1 to 2 slabs, mostly on south and southwest aspects. Old storm snow is generally well-bonded, except possibly in areas with recent wind loading.

Snowpack Summary

Last week's 40 to 70 cm of snow remains soft in sheltered areas but has been redistributed by wind in exposed terrain.

The snowpack is generally strong, with some buried surface hoar 60 to 80 cm deep and crusts near the ground showing no recent avalanche activity.

Treeline snow depths range from 100 to 150 cm.

Weather Summary

Friday Night

Cloudy with 1 to 3 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -7 °C.

Saturday

Mix of sun and cloud with up to 1 cm of snow. 15 km/h west ridgetop wind. Treeline temperature -5 °C.

Sunday

Mix of sun and cloud. 10 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Monday

Sunny. 10 km/h south ridgetop wind. Treeline temperature -0 °C. Above freezing layer from 2000 to 2500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.