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Archived

Avalanche Forecast

Dec 15th, 2024–Dec 16th, 2024
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Badshot-Battle, Central Selkirk, Dogtooth, Esplanade, Glacier, Goat, Gold, Jordan, North Columbia, North Monashee, North Selkirk, Retallack, South Columbia, West Purcell, Whatshan.

Watch for deeper and more reactive deposits around ridges and lee features, especially as you enter open or alpine terrain.

Confidence

Moderate

Avalanche Summary

On Saturday, explosives control work and skier traffic triggered storm slab avalanches to size 1.5, averaging 20 to 30 cm deep. A handful of natural storm slab avalanches to size 2 were observed failing in steep terrain.

Snowpack Summary

10 to 30 cm fresh snow accumulated over the weekend and was redistributed by southerly winds in the alpine and open treeline, wind formed slabs in lee features. This snow covers older snow in most terrain and surface hoar in sheltered locations.

A surface hoar layer is now buried 30 to 70 cm and is most prevalent from 1700 to 2200 m (see this MIN). We're tracking this layer as the load (and resulting slab) builds above it. We may see reactivity increase when the load above reaches a critical threshold. Below 1600 m and on solar slopes a crust is at this interface.

There are no deeper layers of concern.

Weather Summary

Sunday night

Partly cloudy with starry breaks. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -10 °C.

Monday

Partly cloudy. 10 to 20 km/h southeast ridgetop wind. Treeline temperature -8 °C.

Tuesday

Mostly cloudy. 10 to 20 km/h south ridgetop winds. Treeline temperature -9 °C.

Wednesday

Snow, 15-30 cm. 30 to 50 km/h southwest ridgetop winds. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Be careful as you transition into wind-affected terrain.
  • Investigate the bond of the recent snow before committing to your line.

Avalanche Problems

Wind Slabs

Investigate for wind-loaded pockets, especially around ridges and open bowls.

A currently unreactive surface hoar layer is buried 30 to 70 cm. We are tracking this layer as reactivity may increase as more snow loads into a slab above.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5