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Archived

Avalanche Forecast

Dec 3rd, 2024–Dec 4th, 2024
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

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

Exercise caution in steep, wind-affected terrain.

Warm daytime temperatures require extra caution on steep, sun-exposed slopes.

Confidence

Moderate

Avalanche Summary

On Tuesday warming temperatures in the PM initiated small (size 1) loose wet avalanche on steep south facing terrain. Last week explosives testing triggered several small and large (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

Surface hoar has developed in many areas, while steep, south-facing slopes are warming during the day and forming a thin crust as temperatures drop. In sheltered zones, the upper 40–70 cm of snow remains soft, though wind exposure has redistributed snow in open terrain.

The snowpack is well-settled, dense, and generally strong, with a buried surface hoar layer found 60 to 80 cm below the surface.

Treeline snow depths range from 100 to 150 cm.

Weather Summary

Tuesday Night

Mainly clear. 10 to 15 km/h northwest ridge top wind. Treeline temperature 0 °C

Wednesday

Mainly clear. 5 to 10 km/h southwest ridge top winds. Treeline temperature 1 °C.

Thursday

A mix of sun and cloud. 10 to 15 km/h southwest ridge top wind. Treeline temperature 1 °C.

Friday

A mix of sun and cloud. 15 to 25 km/h southwest ridge top wind. Treeline temperature 1 °C.

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.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.

Avalanche Problems

Wind Slabs

Recent westerly winds may have formed wind slabs in leeward terrain features adjacent to ridges.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 1.5

Loose Wet

Use caution when travelling on steep south aspect terrain where even a small avalanche can have consequence when combined with terrain traps such as cliffs.

Aspects: South East, South, South West.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 1.5