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Archived

Avalanche Forecast

Dec 21st, 2023–Dec 22nd, 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
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
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

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

Wind slabs have formed at higher elevations, approach ridgelines and mid slopes rollovers with caution.

Confidence

Moderate

Avalanche Summary

Avalanche activity on Thursday was limited to north facing slopes at treeline and above. Natural avalanches were reported to size 2 in steep terrain features. One wind slab was remotely triggered, indicating touchy conditions.

Snowpack Summary

20-30 cm of storm snow has likely been redistributed by southwesterly winds into wind slabs on north and east facing slopes. There may be a spotty layer of surface hoar about 15-30 cm below the snow surface in sheltered terrain, 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

Thursday Night

Cloudy with 5-10 cm of snow, southwest winds 30-50 km/h. Freezing levels at valley bottom.

Friday

Cloudy with up to 5 cm of snow, southerly winds 20-40 km/h, treeline temperature -7 °C. Freezing levels at valley bottom.

Saturday

Mainly cloudy with up to 10 cm of snow, southerly winds 50-80 km/h. Freezing levels rise to 500 m, treeline temperature -5 °C.

Sunday

Cloudy with moderate snowfall. Southerly winds, 60-90 km/h. Freezing levels rise to 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • 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

Fresh wind slabs formed on Thursday are likely still reactive to human triggers.

Aspects: North, North East, East, South East, 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: All elevations.

Likelihood: Unlikely

Expected Size: 1.5 - 3