Bulletin d’avalanche

Kootenay Boundary

Mar 18 – 19, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

Time to be extra cautious in avalanche terrain. Deep weak layers are under stress and have been producing large avalanches recently.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–4
    Deep weak layers are under heavy stress after recent loading and warming, creating the potential for large and surprising avalanches.

Confidence

Moderate -

Weather Forecast

SUNDAY: Sunny, moderate northwest winds, alpine temperatures around -8 C.MONDAY: Mix of sun and cloud, light winds, alpine temperatures around -5 C.TUESDAY: Afternoon flurries with 5-10 cm, light southwest winds, freezing level climbing to 1500 m with alpine temperatures around -2 C.

Avalanche Summary

Initial reports from Saturday include numerous natural and skier triggered loose wet avalanches at lower elevations (size 1.5) . Reports from Friday include several large natural avalanches including a size 3 persistent slab in the Rossland range and up to size 3.5 deep persistent slabs in the Valhallas (failing on basal facets over 2 m deep).The upper snowpack should stabilize with cooler temperatures, but deeper persistent weak layers remain under heavy stress and have the potential for large and surprising avalanches.

Snowpack Summary

Rain has soaked the upper snowpack for a second time in a week. This time all the way to mountain tops. Cooling temperatures will gradually form a rain crust on the surface, but expect a thick layer of moist snow in the upper snowpack for some time. This heavy snow will stress a number of deeper weak layers including the late-February facet / surface hoar interface (70-120 cm deep), the mid-February crust (90-130 cm deep), and basal facets in shallow snowpack areas.

Régions couvertes