Bulletin d’avalanche

Northwest Coastal

Apr 16 – 17, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    New snow is expected to form widespread storm slabs and stiffer wind slabs in leeward features. It may still be possible to trigger the thicker, older storm slab from the last storm, especially on steep unsupported slopes and thinner snowpack areas.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–7
    A deeply buried persistent weak layer still has the potential to produce very large avalanches and could be triggered by heavy triggers such as cornice falls or smaller avalanches stepping-down.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

A warm front will bring precipitation to the north coast on Wednesday night and Thursday. Unsettled conditions are expected for Friday before the next system reaches the coast on Saturday.Wednesday Night: Precipitation: 5-10mm, freezing level: 1300m, ridgetop wind: moderate S-SWThursday: Precipitation 5-10mm, freezing level: 1100m, ridgetop wind: moderate S-SWThursday Night: Precipitation 10-15mm, freezing level: 700m, ridgetop wind: moderate-strong SWFriday: A mix of sun and cloud, light scattered flurries possible, freezing level: 900m, ridgetop wind: light SWSaturday: Precipitation 5-10mm, freezing level: 1100m, ridgetop wind: strong S-SW

Avalanche Summary

On Monday, a slab avalanche size 2.5 was remotely triggered on a North facing alpine slope in the North Eastern part of the region. This slab released on the deep persistent weak layer buried in mid-February. Widespread activity occurred over the weekend caused by warm temperatures and strong solar radiation. Things have typically stabilized over the last few days due to cooler temperatures and lack of sun. Avalanche activity is expected to increase with warmer temperatures, new snowfall, and moderate-strong winds.

Snowpack Summary

New snow may sit on a crust which exists up to around 1400m on solar aspects or on last week's storm snow (90cm+ in areas of the region). Winds slabs are expected to form in lee features from moderate-strong S-SW winds.Recent warmer temperatures have helped to settle the underlying snowpack. In shallower snowpack areas or on steep, unsupported features, the old storm slab may still be reactive to human-triggering. This older storm slab is sitting on a surface hoar, a crust, and/or facets buried at the beginning of April. Large cornices may still be a concern, especially during periods of warming or heavy loading. The early February crust/facet layer is typically down 1.5 to 2.5m. A smaller avalanche or a cornice fall may still have the potential to step down to layer causing very large, destructive avalanches.

Régions couvertes