Bulletin d’avalanche

Northwest Coastal

Feb 19 – 20, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

A week of benign weather. Watch for isolated wind slabs on a variety of aspects.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind slabs likely exist on a variety of aspects, including fresh wind slabs formed by outflow winds and lingering wind slabs from last week's storm.

Confidence

High - The weather pattern is stable

Weather Forecast

MONDAY: Isolated flurries with trace accumulations, light south wind, alpine temperatures around -4 C.TUESDAY: Isolated flurries with trace accumulations, light northwest wind, alpine temperatures around -6 C.WEDNESDAY: Mix of sun and cloud, light northwest wind, alpine temperatures around -8 C.

Avalanche Summary

On Saturday, several small size 1 wind slabs were reported. Small loose dry avalanches running on the rain crust have also been reactive to skier traffic. Watch for isolated pockets where thicker wind slabs could produce larger avalanches.

Snowpack Summary

Clear cold weather and shifting winds have created a variety of surface conditions including isolated wind slabs, pockets of soft snow (15-25 cm deep), sun crusts, and surface hoar. A supportive rain crust exists below 1000 m. A layer of surface hoar that was buried on February 10th can be found buried 30-60 cm deep at treeline elevations and has been reactive in some recent snowpack tests. Below this layer, the snowpack is generally settled and strong. The exception is shallow snowpack areas around Bear Pass and Ningunsaw where basal facets remain an ongoing concern.

Régions couvertes