Bulletin d’avalanche

Sea To Sky

Jan 30 – 31, 2012Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–5
    Moderate snowfall amounts and strong winds have set up new wind slabs on lee slopes. Strengthening has occurred, but triggering is still possible on unsupported terrain.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–6
    Strong winds and new snow have added mass to sensitive cornices. They may be destructive by themselves, and may also be a trigger for the slope below.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–5
    Heavy amounts of storm snow have fallen on a variety of old surfaces. A deeper release has decreased in probability, but would have a high consequence.

Confidence

Fair - Freezing levels are uncertain on Thursday

Weather Forecast

Tuesday: light snowfall continuing through the evening / moderate southwest winds / freezing level at 1000m Wednesday: light snowfall in the morning with clearing by the afternoon / light southwest winds / freezing level at 1000m Thursday: clear / light southwest winds / freezing level climbing throughout the day to 1200m

Avalanche Summary

1 size 2 and numerous size 1 explosives-controlled avalanches were observed in the Whistler area on Monday.

Snowpack Summary

The region saw variable amounts of snow with moderate to strong winds and warmer temperatures on Sunday. The variable and cohesive windslabs that formed at treeline and in the alpine have strengthened somewhat, but could become reactive on unsupported features below ridgecrests. These new windslabs are resting on impressive amount of storm snow that fell last week. By now last week's storm snow should be well settled.About a metre down there are a variety of older snow surfaces that formed throughout January. These surfaces include facets, old wind slabs, and crusts. These interfaces have also gained considerable strength, but triggering may be possible with a heavy load in isolated terrain. Previous concerns about deeper persistent weak layers appear to have diminished.Snowpack depths at treeline are in the region of 260 cm.

Régions couvertes