Bulletin d’avalanche

Northwest Coastal

Dec 20 – 21, 2023Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Wind slabs at upper elevations are the main concern.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Wind direction has switched over the past few days so expect to find wind slabs on a variety of aspects.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1.5–3

    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.

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 10-20 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

Tuesday Night

Cloudy with a trace of snow, ridgetop wind southwest 20 to 30 km/h, treeline temperature -6 °C.

Wednesday

Cloudy with 3-5 cm of snow, ridgetop wind southwest 30-50 km/h, treeline temperature -5 °C.

Thursday

Cloudy with 5 to 15 cm of snow, ridgetop wind south 30-60 km/h, treeline temperature -6 °C.

Friday

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

Régions couvertes