Bulletin d’avalanche

Banff Yoho Kootenay

Feb 22 – 23, 2014Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

We are strongly urging people to be very conservative this weekend with their terrain choices. This is due to the nature of the weak layer currently in the snowpack. SH

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Wind slabs have been forming at higher elevations from SW winds over the last few days.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3
    There is still a poor bond between the storm snow and the Feb.10 layer of facets and surface hoar. This interface is still very susceptible to human triggering.

Weather Forecast

Expect flurries with local amounts of 5cm on Saturday. Temperatures will be in the -15 to -20 range over the weekend. Light gusting moderate NW winds for Saturday.

Snowpack Summary

30-70cm of recent storm snow is settling and overrides the Feb10th interface. A poor bond persists at this interface and many avalanches have been observed on this layer over the past week. Recent SW winds have created wind slabs in lee alpine terrain. These wind slabs are easily triggered and often step down to the Feb 10th interface.

Avalanche Summary

The natural avalanche cycle seems to have subsided, but skier triggered avalanches (up to class 2) were reported in the Lake Louise on Thursday, and two skier remotes were reported on the moraine approach to Peyto Glacier on Wednesday. Avalanche control on Mt. Whymper today produced avalanches to sz 2.5, likely failing on the Feb.10th interface.

Confidence

Due to the number of field observations on Friday

Régions couvertes