Bulletin d’avalanche

Kootenay Boundary

Mar 18 – 19, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Although storm accumulations from the weekend are likely gaining strength, they may still be reactive in some wind-exposed terrain, or in areas where they overlie buried surface hoar.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    3–5
    The deeply buried weak layers that formed in early February are still showing reactivity in snowpack tests. Possible triggers for a large destructive avalanche include cornice fall, a large force in a thin snowpack area or solar warming.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Forecast

Wednesday: Light snowfall intensifying overnight (up to 10cm) / Moderate to strong westerly winds / Freezing level at 1300mThursday: Continued flurries with possible sunny breaks / Moderate westerly winds / Freezing level at surfaceFriday: A mix of sun and cloud / Light northwest winds / Freezing level at surface

Avalanche Summary

Avalanche control on Monday produced numerous storm slabs to size 2 which occurred on a variety of aspects at treeline and in the alpine.

Snowpack Summary

Up to 40cm of recent storm snow was blown by variable strong winds into deeper deposits in lee terrain. These recent accumulations overlie crusts on previously sun-exposed slopes and surface hoar in shaded terrain. Rain at lower elevations has saturated the snowpack. Where the air temperature has dipped below freezing, lower elevation surfaces may exist as a refrozen crust.Below the new snow, 60-100cm of settled snow sits above buried surface hoar and crusts. The deeper facet/crust persistent weakness buried at the beginning of February, now down 70 to 160cm, has been highly variable in terms of reactivity but still shows 'sudden' results in snowpack tests. Needless to say, this interface is still very difficult to trust and any avalanche at these deeper, persistent interfaces would be large and destructive.Weak basal facets exist in many areas, but without a large load, triggering now is unlikely.

Régions couvertes