Bulletin d’avalanche

Northwest Coastal

Apr 18 – 19, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

This bulletin was created using very limited field data. If you are out in the mountains, please send your observations to [email protected]

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.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Rain at lower elevations will saturate and destabilize the upper snowpack.  Loose sluffing from steep terrain features is possible, especially from human-triggering.

  • 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

Unsettled conditions and light precipitation are expected for most of Saturday before the next low pressure system hits the north coast Saturday evening. Precipitation will ease a bit during the day on Sunday before a second pulse arrives Sunday evening. Light precipitation is expected for Monday. Saturday: Precipitation 2-5mm, freezing level am: 900m pm: 1300m, ridgetop wind: moderate-strong SE-SWSat. Night: Precipitation 8-15mm, ridgetop wind: strong SE-SWSunday: Precipitation 4-6mm, freezing level am: 1000m pm: 1200m, ridgetop wind: strong SE-SWSun. Night/Monday: Precipitation 6-12mm, freezing level am: 800m pm: 1100m, ridgetop wind: moderate-strong S-SW decreasing to light SE-S

Avalanche Summary

No new reported but this is likely due to a lack of observers.  Some natural avalanche activity is expected at higher elevations.

Snowpack Summary

10-40cm of 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 have formed in lee features at treeline and above from 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