Bulletin d’avalanche

Purcells

Dec 19 – 20, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

New snow, strong winds and rising temperatures make a good recipe for rising avalanche danger over the next few days.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Storm snow is expected to be shifted by winds into slabs on lee slopes. In more sheltered areas, loose snow avalanches may be encountered in steep terrain. The new snow sits above a weak layer of buried crystals in some locations.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    There is still the potential to trigger a deeply buried weak layer, resulting in a surprisingly large avalanche.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Expect light to locally moderate snow from Saturday to Monday. Temperatures rise towards 0 at 1500m by Saturday. Winds are expected to be moderate to strong from the west to south-west throughout the period.

Avalanche Summary

On Thursday and Friday, explosive control produced several size 1-2 slabs. These slabs were around 20cm thick. In the Dogtooth area, these failed on reloaded bed surfaces (early November rain crust/facet layer). A size 2.5 naturally-triggered slab was observed at 2600m on an east aspect on Friday.

Snowpack Summary

New snow sits on variable surfaces including wind-affected snow, surface hoar and a crust which exists below about 2200m. Winds are expected to shift new snow onto lee slopes over the next couple of days. A thick rain crust with facets from early November is buried over 1 m down and may still be reactive in isolated areas. A weak layer from the end of November sits in the middle of the snowpack and is still reactive in some areas.

Régions couvertes