Bulletin d’avalanche

Banff Yoho Kootenay

Dec 11 – 12, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Now is an excellent time to put your snow profile skills to work - the Dec 3 surface hoar layer is widespread below 1800 m. Dig down, look for this layer, and test it - this has the potential to become a tricky persistent slab avalanche problem.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    The recent storm was accompanied by moderate to strong winds at treeline and above. For a few more days, watch out for fresh windslabs in typically suspicious areas after a storm: leeward and cross loaded slopes or slopes near ridge crests.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    40-70cm of storm snow has fallen over the week, now settled into a slab overlying a dangerous layer of surface hoar below treeline. Treat all slopes below treeline with suspicion until you can rule out this weak layer.

Confidence

Due to the number of field observations

Weather Forecast

The main storm pulse is now over for the Rockies, but expect Friday to be overcast with flurries and accumulations of a few centimeters. Temperatures will range from -4 to -10 and winds will be light to moderate from the west.

Snowpack Summary

50-70 cm of storm snow has fallen over the past 7 days, now settled into a cohesive slab overlying a significant weak layer of surface hoar below treeline (and just into treeline). Distribution of this layer is still vague, but you should assume it's widespread below 1800 m. In the alpine, winds from the recent storm have left widespread windslabs.

Avalanche Summary

Avalanche control at the Sunshine ski resort produced small slab avalanches in leeward areas, but otherwise no significant avalanches have been reported - keep in mind that backcountry observations have been very limited over the past week.

Régions couvertes