Bulletin d’avalanche

South Columbia

Jan 8 – 9, 2015Avalanche Canada
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Archivé · expiré 12 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

Diligence may be required to maintain conservative decisions in the face of fair weather and decent riding conditions over the weekend.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    3–6
    A persistent weakness buried mid-December is primed for human triggers and wide propagations producing very large avalanches. Remote triggering from flat terrain and step-down from shallower weaknesses makes this problem especially tricky to manage.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–4
    Heavy amounts of recent storm snow has settled into thick slabs that are highly sensitive to human triggers.

Confidence

Good

Weather Forecast

Mostly cloudy with a chance of light flurries Friday evening and Saturday, but generally dry for Sunday. Freezing levels remain in valley bottoms for the forecast period, with above freezing alpine temperatures expected for Friday. Winds should remain generally light and variable.

Avalanche Summary

Natural avalanche activity has tapered off, but storm and persistent slabs remain highly sensitive with several reports of human-triggered avalanches up to Size 2 and explosive-triggered avalanches up to Size 3. Of note were several remotely triggered avalanches involving persistent slabs showing the ability of these weaknesses to propagate into very large avalanches.

Snowpack Summary

Warm temperatures are aiding in the settlement of the recent storm snow resulting in sensitive storm slabs up to 70 cm thick. A breakable surface melt-freeze crust can be expected on all aspects below approximately 1800 m and sun-exposed slopes above. Around 80-120 cm down in the snowpack the mid-December surface hoar/crust weakness continues to be highly sensitive to human triggers with reports of remote triggering and long fracture propagations.

Régions couvertes