Bulletin d’avalanche

Northwest Coastal

Feb 23, 2018Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Weather forecast models disagree about snow amounts. If it is snowing heavily and/or blowing in your area, expect high avalanche danger.

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–2
    Dry new snow is likely to sluff easily in steep terrain, especially where it overlies a hard crust.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2.5
    New snow and wind are building fresh slabs, which may fail naturally or with the weight of a person. A storm slab could step down to a deeper weak layer, creating a surprisingly large avalanche.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Friday

Weather Forecast

THUSRDAY NIGHT/ FRIDAY: 20-40 cm light dry snow. Freezing level near 600 m. Moderate south-westerly winds. Weather models suggest heaviest snow in the Terrace area, with less as you travel east and north.SATURDAY: 5-10 cm snow. Freezing level near 400 m. Moderate south-westerly winds. SUNDAY: 10-20 cm snow. Freezing level near 400 m. Light to moderate south-westerly winds. More details can be found in the Mountain Weather Forecast.

Avalanche Summary

Rapid wind loading caused a natural avalanche cycle on Wednesday. On steep solar aspects, size 1-2 loose wet avalanches were also observed.New snow and wind are expected to cause a rise in avalanche activity on Friday and the weekend.

Snowpack Summary

Incoming snow is expected to be light and dry, but will come with moderate to strong south-westerly winds. Loose snow sluffing and fresh wind slabs are likely problems on Friday. New snow will overlie old soft and hard wind slabs. In the upper pack is an interface of sun crusts, facets and spotty surface hoar (which is most prevalent in sheltered treed locations). Deeper in the snowpack, around 50-150 cm down, you'll find a crust/surface hoar layer, which still has the chance to surprise you and could be triggered from a thin snowpack spot, or with a large trigger like cornice fall.

Régions couvertes