Bulletin d’avalanche

South Columbia

Jan 29 – 30, 2016Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Patience and diligence may be required to resist venturing into complex terrain as the snowpack settles and adjusts to the recent load and warming.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    Surface hoar buried at the beginning of January remains primed for human triggers. The potential for widespread propagation and remote triggering makes this persistent slab particularly tricky to manage.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Fresh storm and wind slabs are sensitive to human triggers an particulary touchy where they are bonding poorly to recently buried surface hoar or crust.

Confidence

High

Weather Forecast

SATURDAY: A mix of sun and cloud with isolated light flurries. Freezing levels around 1200m and light southwesterly winds. SUNDAY: A mix of sun and cloud and possible isolated light flurries with freezing levels dropping below valley bottoms and light variable winds. MONDAY: A mix of sun and cloud with isolated light flurries. Freezing levels in valley bottoms and light southwesterly winds.

Avalanche Summary

Reports from Thursday include a several storm and wind slab avalanches up to Size 2 from natural and human triggers.

Snowpack Summary

Weaknesses exist within and under the recent settled storm snow, with snowpack tests producing easy to moderate results down 15-20cm (or deeper where wind-loaded) on buried surface hoar, decomposing storm snow or a thin crust, and hard results down 45-65 cm on a crust buried mid January. The persistent weak layer of buried surface hoar, sun crusts, rime crusts and/or facets that was buried in early January is now down close to a metre in most places and producing hard but sudden results in snowpack tests. The overlying slab remains primed for triggering and is especially touchy at and below treeline. The lower snowpack is well settled and strong.

Régions couvertes