Bulletin d’avalanche

Kootenay Boundary

Dec 22 – 23, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–4
    Loose dry snow remains unconsolidated in terrain that is protected from the wind. There is a lot of new snow; sluffing may entrain enough snow to bury a skier/rider.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–5
    Additional snow and wind will continue to build touchy storm slabs at all elevations. Recent light snow may also be transported by forecast strong southwest winds into deep wind slabs on North through East aspects.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

A Southern flow with embedded troughs will continue to dominate the region through Monday, bringing additional snowfall amounts. A weak ridge develops Monday showing dryer conditions throughout the day.Saturday night into Sunday: Snow amounts 5-10 cm overnight with an additional 5-10 cm tomorrow, ridgetop winds light from the SW, alpine temperatures near -6. Monday: Light snowfall amounts in the morning, ridgetop winds light from the SE, and alpine temperatures near -4.Christmas Day: Mainly dry with possible sunny breaks, ridgetop winds light from the South, and alpine temperatures -10.

Avalanche Summary

Explosive testing on Friday showed numerous size 1.0-2.0 slab avalanches on N-NW aspects 2000 m and above. Several natural size 1.0 loose snow avalanches occurred from steeper terrain features.

Snowpack Summary

Around 110 cm new snow has fallen in the last week. Consistent, moderate SW winds have been retributing the new snow onto lee slopes and behind terrain features. In areas of wind effect, expect the storm slab to be stiffer, easy to trigger and more reactive. In most places the slab is still relatively unconsolidated and soft and it is not propagating far. Expect heavy sluffing in steep terrain. Large sluffs may be able to push you around; beware of terrain traps. Below the storm snow sits a well settled mid-pack that has not been showing shears in snow profile tests.

Régions couvertes