Bulletin d’avalanche

Northwest Coastal

Apr 10 – 11, 2015Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Safe travel will require a great deal of caution. Be aware of recent wind loading and the potential to trigger deeply buried weak layers.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Wind slabs are forming with the new snow and high winds. Use caution on lee slopes.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Additional loading on the March 25 combination layer may make this layer extremely touchy. Use caution in wind loaded areas and other deep deposition zones.

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

SATURDAY: Should see a slight tapering-off of precipitation during the day, with freezing levels around 800m during the day, and lowering to 500m at night. SUNDAY: Will ramp up precipitation with another 8 to 10 cm of snow at upper elevations. Freezing levels again from 500m overnight to 800m with daytime heating. MONDAY:  Is forecast for another 5 to 10 cm of snow. Precipitation will be heavier towards the coast, but the inland portion of the Northwest Coast may see as much as 45 cm of snow at upper elevations for the period Thursday though Monday. Winds moderate to strong from the south west for the forecast period.

Avalanche Summary

No reported avalanche observations from yesterday, but commercial operators reported strong winds in the alpine stripping the new snow down to old crust surfaces and building wind slabs and sastrugi.

Snowpack Summary

New snow will be redistributed by strong south west winds into wind slabs on lee slopes. The March 25th surface hoar / crust layer may now become reactive with the new snow loading This interface has been more reactive recently in the northern part of the region, but has been reported throughout the northwest coastal area. The earlier March facet/crust persistent weakness is now down over a metre and has been producing hard, sudden planar results in snowpack tests.

Régions couvertes