Bulletin d’avalanche

Kootenay Boundary

Mar 29 – 30, 2019Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Expect loose wet avalanches if the sun comes out long enough to warm up and weaken the snow surface.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–1.5
    Recent 15 cm of snow from the beginning of the week combined with moderate to strong southwest winds has created thin wind slabs in the lee of terrain features which might still be triggered by skiers and riders.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–1.5
    If the sun comes out the snow surface will weaken with increasing air temperatures and solar input and increase the likelihood of thin loose wet avalanches running in steep terrain, especially on those slopes facing the sun.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

FRIDAY NIGHT: Clear with a few clouds, light northerly wind, alpine temperature -2 C, freezing level 1600 mSATURDAY: Mix of sun and cloud, light westerly wind, alpine temperature -1 C, freezing level 2200 mSUNDAY: Cloudy, up to 5 cm precipitation, light southwest wind, alpine temperature -2 C, freezing level 2000 mMONDAY: Cloudy, light north wind, alpine temperature -2 C, freezing level 2000 m

Avalanche Summary

On Thursday only few small loose wet and loose dry avalanches were observed. On Wednesday loose wet avalanches to size 1 were observed in the afternoon on solar aspects. On Tuesday and Wednesday there were reports of skier triggered thin wind slabs to size 1.5.

Snowpack Summary

At upper elevations, the recent 15 cm snow from the beginning of the week is bonding well with the melt-freeze crust or moist snow below. Some of the recent snow was redistributed by southerly winds which formed isolated thin wind slabs. These wind slabs may still be triggered by humans. At lower elevations, expect to see a supportive crust on or near the surface if there is a good overnight freeze. This crust sits above a largely moist or wet snowpack.

Régions couvertes