Bulletin d’avalanche

Northwest Coastal

Apr 19 – 20, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
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
    Possible - Likely
    Taille
    1–4
    Recent storm snow may have formed storm slabs in some areas and strong SW winds have formed stiffer wind slabs in leeward features.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - 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 or intensity of solar radiation is uncertain

Weather Forecast

Light precipitation is expected for the north coast on Sunday. Unsettled conditions are expected for Monday and Tuesday resulting in light scattered showers and a mix of sun and cloud. Overnight freezing levels will vary depending on local cloud cover.Sunday/Sun. Night: Precipitation 5-8mm, freezing level am: 900m pm: 12000m, ridgetop wind: moderate-strong S-SWMonday: A mix of sun and cloud, light scattered precipitation, freezing level am: 800m pm: 1200m, ridgetop wind: light SE-STuesday: A mix of sun and cloud, light scattered precipitation, freezing level am: 800m pm: 1100m, ridgetop wind: light SW-W

Avalanche Summary

Reports from Friday of sluffing from steep sun exposed terrain features and isolated slabs releasing from leeward features on ridgecrests.

Snowpack Summary

Highly variable spring conditions are being reported in the region. At lower below-treeline elevations the snowpack is typically wet and isothermal. It has not been refreezing overnight and is melting quickly. Between roughly 1000 and 1500m, the snowpack is undergoing daily melt-freeze cycles. The same conditions can be expected on sun-exposed slopes all the way to mountain-top. On higher elevation north-facing slopes, dry snow can be found. Recent strong S through W winds have scoured windward slopes and created wind slabs in leeward slopes. In wind sheltered areas, the new storm snow has formed a storm slab which typically sits on a firm crust. 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