Bulletin d’avalanche

Northwest Coastal

Jan 16 – 17, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Give recently wind-loaded slopes a wide berth.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Wind slabs are building and adding stress to the snowpack, especially at high elevations.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    A deeply buried crust layer is still on the radar. It could be triggered by wind slabs or cornice fall, or by the weight of a person in a thin or variable snowpack area.

Confidence

Fair - Intensity of incoming weather systems is uncertain on Sunday

Weather Forecast

Expect 10-15 cm snow on Saturday with strong S to SW winds and the freezing level near 900 m. A second system is forecast to affect the area on Sunday, petering out slowly on Monday. Anywhere from 10-40cm snow is expected, with strong S-SW winds and freezing level around 800 m.

Avalanche Summary

A skier triggered a size 1 wind slab on Thursday. Size 2 glide slabs were also reported to have failed naturally in the Skeena highway corridor. On Wednesday, naturally triggered wind slabs were reported at around 1800 m on N to NW aspects. Observations have been limited during the storm.

Snowpack Summary

Strong winds have redistributed the recent storm snow into wind slabs, and rain is saturating the surface of the snowpack to at least treeline elevations. Above treeline, a rain crust and a buried surface hoar layer 10-20cm below the surface have been reported. The mid-December crust/facet layer exists throughout the area where it hasn't been wiped out by recent avalanche activity. The November crust near the bottom of the snowpack is generally well bonded but may still be reactive in areas with a shallow snowpack.

Régions couvertes