Bulletin d’avalanche

Northwest Inland

Mar 30 – 31, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Forecast new snow and wind are expected to develop new wind slabs in the lee of southwest winds.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Expect new wind slabs to develop due to the forecast new snow and wind.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–3
    A weak layer of facets and/or a crust that developed early in the winter lies near the bottom of the snowpack. Any change in the weather may affect the likelihood of triggering this deep weak layer.

Avalanche Summary

Storm slabs up to size 2.5 were reported from the western extent of the region in the Howson's, where the snowpack is more like the Northwest Coastal region. No new avalanches reported from the rest of the region.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Friday

Weather Forecast

Overnight: Cloud and strong southwest winds developing overnight, with 3-5 cm above 700 metres by morning. Friday: Overcast with strong southwest winds, another 3-5 cm during the day with daytime freezing up to 1200 metres. Saturday: Overcast with a few cm of new snow and moderate southwest winds. Sunday: Overnight freezing down to valley bottoms. Overcast with flurries or light snow and moderate westerly winds.

Snowpack Summary

Light snow combined with moderate southwest winds has developed wind slabs in the alpine and in some exposed treeline locations. Periods of sun and high daytime freezing levels have developed crusts below treeline and on sun exposed terrain at all elevations. The snow may be moist or wet below treeline during the warmest part of the day. The Mid-February crust and facet layer was reported to be down 75-90 cm in the Houston Telkwas sled area on Wednesday. The deep persistent weak layer of facets and/or a crust that were buried early in the winter are still lingering near the bottom of the snowpack. This MIN report found the deep weak layer strengthening in the Telkwas.

Régions couvertes