Bulletin d’avalanche

Northwest Coastal

Apr 19 – 20, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Forecast new snow may release as loose wet avalanches during the warmest part of the day. Some thin wind slabs may also develop in the alpine.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    The likelihood of cornices triggering increases with intense sunshine and/or during the warmest parts of the day.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Loose wet avalanches are likely at lower elevations where the snowpack may be isothermal. At higher elevations the loose wet problem is driven by exposure to sun and daytime warming. When the sun is strong, wet slab avalanches may be a concern.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Thursday

Weather Forecast

Overnight: 5-10 cm of new snow with moderate southwest winds and freezing down to 600 metres. Thursday: 3-5 cm of new snow with moderate southwest winds and daytime freezing up to 1400 metres. Friday: Mostly sunny with light winds and daytime freezing up to 1800 metres. Saturday: Overcast with strong southeast winds and daytime freezing up to 1800 metres.

Avalanche Summary

Loose wet avalanches up to size 2.5 were reported on Monday from steep terrain below treeline west of Terrace. Wet slab avalanches up to size 3.0 were reported in the Oscar peak area, as well as small loose wet avalanches and one natural cornice fall that did not release a slab on the slope below.

Snowpack Summary

Recent snow has been transported by the wind, and high alpine terrain may be stripped down to ice or old hard surfaces. Wind deposited snow may be sitting on a variety of old surfaces including hard wind crusts in exposed terrain and sun crusts on solar aspects. Dry snow was reported from shaded north aspects at the highest elevations in the alpine.

Régions couvertes