Bulletin d’avalanche

South Coast

Apr 9 – 10, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Yesterday's avalanche accident near Lions Bay highlights that it's still winter at higher elevations.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Warm temperatures should help recent snow bond and settle in place; however, isolated wind slabs may linger.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Rain at lower elevations has led to a gradual break down of surface crusts and has contributed to wet snow sluffing and gathering mass in steep terrain.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

MONDAY: Overcast sky with another 10 or 15 cm of snow at high elevations overnight Sunday and into Monday morning. Alpine and Treeline temperatures from a couple of degrees below freezing to a couple of degress above freezing. Freezing level around 900 m. Light to Moderate southerly windsTUESDAY: Mix of sun & cloud with a trace of precipitation. Termperatures at Treeline between -3 and +3 C with freezing level near 1500m. Light southeast or east winds.WEDNESDAY: Overcast with around 15 cm of snow at higher elevations but rain down lower. Similar temperatures (as cold as -5C and as warm as +2C) and freezing level (around 1600m). Moderate SE wind.

Avalanche Summary

On Monday the main concern is wind slab avalanches where the recent precipitation fell as snow and was drifted by the wind behind ridges. At tree line expect small loose wet avalanches in steep terrain. Saturday's fatal avalanche on Mt Harvey (near Lion's Bay) was the result of people being on a cornice that broke.

Snowpack Summary

Saturday's cold stormy weather brought snow to the mountains as low as 800m. It's still winter up high! Sunday was a calmer and dryer day but isolated lingering wind slabs remain a concern. At lower elevations, rain has saturated an already wet snowpack.

Régions couvertes