Bulletin d’avalanche

Northwest Coastal

Jan 18 – 19, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–6
    Strong to extreme westerly winds have continued to create touchy wind slabs in exposed lee and cross-loaded terrain at higher elevations. Heavy accumulations in the north have created a very destructive storm/ windslab instability.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    3–6
    There has been no new activity reported on this layer. Having said that, the weakness still exist with the potential to produce large avalanches.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Rain at lower elevations is maintaining a weak snowpack. Watch for triggering in steep start zones.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Only trace amounts of new snow (possibly higher amounts on Monday in the North) are expected for the forecast period. Winds should remain mainly light to moderate from the southwest with freezing levels hovering between 800-900m.

Avalanche Summary

Due to inclement weather observations have been very limited; however, numerous moist or wet snow avalanches to size 2.5 were reported from the region on all aspects at treeline and below. On Thursday numerous avalanches ran to size 3.5 in the north of the region where recent snow accumulations were the highest. They occurred in response to heavy snowfall and strong to extreme winds.

Snowpack Summary

Rain below treeline has maintained moist snow at lower elevations, although a nightly crust recovery is likely with forecast clear skies.  Light amounts of new snow (moderate to heavy amounts in the north) exist as new storm slabs and windslabs at treeline and above. A persistent weakness of surface hoar or facetted snow buried at the end of December sits below all of the more recent storm snow and is still on the radar of professionals in the area. The mid and lower snowpack is generally well settled and strong, although well developed basal facets remain a concern in shallow snowpack areas.

Régions couvertes