Bulletin d’avalanche

Purcells

Mar 28 – 29, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Recent accumulations have likely been blown into pockets of wind slab by generally moderate southwest winds.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–6
    There are a number of persistent layers in the mid to lower snowpack which have professional operators concerned. Possible triggers include cornice fall, thin spot triggering and/or solar warming.

Confidence

Fair - Forecast snowfall amounts are uncertain on Sunday

Weather Forecast

Saturday: Light to locally moderate snowfall overnight Friday into Saturday. Freezing level 1600m. Winds light southwest.Sunday: Cloudy with light to locally moderate amounts of snow possible. Freezing level rising to 1800m. winds light west.Monday: Scattered flurries. Freezing level 1500. Winds light to moderate west.

Avalanche Summary

Recent reports from the central part of the region (where the most recent snowfall was intensified) indicate natural and explosives triggered avalanches running in the alpine to size 2.5 on all aspects. These were isolated to the most recent storm snow.

Snowpack Summary

5-40cm of new snow has fallen in the region (5-10 in the north and up to 40 in the central). This new snow is settling and likely being formed into soft wind slabs immediately lee of ridge crests. Moist snowNumerous crusts can be found in the upper 60cm of the snowpack on south facing slopes. The March 15 crust/surface hoar interface is down 50-80cm. Down90-120cm below the surface you may find surface hoar and crusts buried at the beginning of March. This interface is still touchy in some areas, particularly in the north of the region. It also continues to produce sudden planar failures in compression tests.The deeper facet/crust persistent weakness buried at the beginning of February, now down 120 - 200cm, still seems to be reactive and should not be trusted. Needless to say, 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 is unlikely.

Régions couvertes