Bulletin d’avalanche

Northwest Coastal

Mar 17 – 18, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

Winds have created a variable snowpack. Be alert to conditions that change with aspect and elevation.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Wind slabs have formed on many slopes following shifting winds. Cornices may be fragile and could break off further back from the edge than expected.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Generally light precipitation is expected on Wednesday  and Thursday, with the freezing level around 1200 m and winds moderate to strong from the S to SE. On Friday, a more organised system brings 5-15 mm precipitation with the freezing level near 1400 m.

Avalanche Summary

On Monday, several loose avalanches to size 1.5 were observed on solar aspects. A skier triggered a size 1 wind slab in the alpine. Explosives control on Sunday triggered several very large avalanches near Stewart, failing at ground or on a deeply buried crust.

Snowpack Summary

Around 1 m of recent storm snow was redistributed by strong and variable winds, creating widespread wind slabs. Operators now report reasonable settlement and bonding within the storm snow. Older buried surfaces include wind slabs, hard crusts, surface hoar, and/or surface facets. The mid-pack is generally well-settled and strong. At the base of the snowpack, weak facets may be found, particularly on shallow alpine slopes in the north of the region. Cornices are large and potentially fragile. Below treeline, the snow appears to be in a spring melt-freeze cycle.

Régions couvertes