Bulletin d’avalanche

Purcells

Dec 22 – 23, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

It's easy to trigger avalanches right now. Conditions are expected to deteriorate further before Christmas. Play safe.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Recent new snow has built slabs over a touchy layer of buried surface hoar crystals, creating dangerous avalanche conditions.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–5
    In some parts of the region, large avalanches have been failing on a deeply buried weak layer.

Avalanche Summary

On Sunday, several size 2-2.5 naturally-triggered avalanches were reported. Storm slabs were also triggered by explosives and a skier. Both failed on buried surface hoar.

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

Expect moderate snowfall on Tuesday (5-20cm) with moderate to strong south-westerly winds and freezing level around 1200m. A cooler northwest flow may bring light snow or flurries on Wednesday and Thursday.

Snowpack Summary

Anywhere from 20-60cm of recent storm snow overlies a touchy layer of buried surface hoar, which sits on a crust below about 2100m. Winds from the north-west through south-west have created wind slabs, which are very reactive where they overlie the buried surface hoar. A lower layer of surface hoar is also reactive at the northern end of the range, buried down about 40cm. A hard rain crust with facets from early November is buried over 1 m down and is still reactive to light loads in some locations.

Régions couvertes