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Archived

Avalanche Forecast

Dec 20th, 2023–Dec 21st, 2023
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Boundary, East Stikine, Ningunsaw, Northwest Coastal, Stewart, West Stikine.

There is uncertainty with snowfall amounts on Thursday. Expect avalanche danger to rise through the day as snow accumulates.

Confidence

Moderate

Avalanche Summary

Recent avalanche activity has been reported as a few explosives triggered size 1-2 wind slabs on north and east aspects in the alpine.

Snowpack Summary

Recent new snow has been redistributed by predominantly southwest winds. There may be a newly buried layer of surface hoar about 15-30 cm below the snow surface at treeline and below.

A layer of facets buried at the end of November can be found 100 to 200 cm below the surface. The snowpack depth varies between 150 and 250 cm at treeline.

Weather Summary

Wednesday Night

Cloudy with 5-10 cm of snow, ridgetop wind southwest 20 to 40 km/h, treeline temperature -7 °C.

Thursday

Cloudy with 5-10 cm of snow, ridgetop wind southwest 30-50 km/h, treeline temperature -5 °C.

Friday

Cloudy with 5 to 10 cm of snow, ridgetop wind south 20-40 km/h, treeline temperature -7 °C.

Saturday

Mainly cloudy with flurries, ridgetop wind south 20-40 km/h, treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid rock outcroppings, convexities, and anywhere the snowpack is thin and/or variable.

Avalanche Problems

Wind Slabs

Snow and wind through Thursday will continue to promote wind slab formation

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

A deeply buried layer of facets sitting on a hard crust 100-200 cm below the snow surface is likely unreactive. It may be triggered from a thin spot or by a very heavy load such as a cornice failure.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 1.5 - 3