Bulletin d’avalanche

Purcells

Dec 22 – 23, 2015Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Conditions are expected to improve over the forecast period. Make observations continually as you travel.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Recently formed wind slabs have become less likely to trigger. That said, I'd remain cautious in high elevation lee terrain where wind slabs may still be sensitive to light inputs such as skiers or riders.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    A layer of buried surface hoar can be found between 1400m and 1800m. Although this layer has become less likely to trigger, I'd remain cautious on steep roles in cut-blocks and open glades below treeline.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

A benign yet cool weather pattern has set up and will continue for the forecast period. For each day, expect a mix of sun and cloud with isolated flurries, although slightly higher accumulations are possible in the far south of the region. Ridgetop winds are expected to remain light while alpine temperatures should remain between -12 and -16.

Avalanche Summary

Evidence of a few natural wind slab avalanches to size 2 was observed in lee alpine terrain on Monday and Tuesday. The avalanches occurred in response to new snow and wind on the weekend.

Snowpack Summary

Throughout last weekend there was up to 20cm of new snow. Strong southerly winds have redistributed much of this snow into soft wind slabs in exposed lee features in the alpine and at treeline. Between 40 and 80cm below the surface you'll likely find a layer of weak buried surface hoar which is most prominent between 1400m and 1800m although it may extend higher in the mountains south of Invermere. Snow pit tests suggest that human triggering of this interface is becoming unlikely, although a release at this interface could be destructive in nature.

Régions couvertes