Bulletin d’avalanche

Kootenay Boundary

Mar 21 – 22, 2013Avalanche Canada
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Archivé · expiré 14 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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Don't let Fridays light winds lure you into complacency.  Previously strong winds Weds/Thurs night will likely have formed fresh sensitive wind slabs on wind exposed slopes at both treeline and alpine elevations.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    I expect active sluffing to remain a problem on wind sheltered slopes.  Be sure you know where your sluff is in relation to yourself and others.

Confidence

Good

Weather Forecast

Synopsis: The pattern over the next five days starts out cool, convective and gusty. It will gradually turn milder, more stable and less windy towards SaturdayFriday: Freezing Level: 1000m Precip: 2/5mm – 4/10cm Wind: Light gusting mod NorthSaturday: Freezing Level: 1100m Precip: No significant precip expected. Wind: Light gusting mod NorthSunday: Freezing Level: 1000m  Precip: : No significant precip expected. Wind: Light, NE

Avalanche Summary

The storm snow sluffed easily on the previous snow surface that is a thin crust.  Reports of skier triggered, fast moving, loose snow avalanches to size 1.5 came in from across the region.  Over the past few days numerous size 1-2 avalanches have been triggered naturally, by skiers, explosives and vehicles. In most cases, the new snow was failing on the hard crust below. Many were soft slabs where the wind had sifted the snow onto lee slopes, and several were loose dry avalanches.

Snowpack Summary

The boundary pulled a respectable 20 - 30 cm of snow from Wednesday's storm.  Much of this snow came to rest on a thin crust that is present on almost all aspects with the exception being due North.  A thick supportive crust can be found down 50 - 80 cm.  A buried surface hoar down 80 - 90 cm continues to fail in a sudden planar fashion when tested. Potentially large fragile cornices loom over many slopes.

Régions couvertes