Bulletin d’avalanche

Northwest Coastal

Jan 12 – 13, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
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
    1–3
    Northerly outflow winds have created new wind slabs in exposed lee and cross-loaded terrain.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    A weak layer of surface hoar and/or facetted snow exists under the recent storm snow and has been susceptible to human triggering.

Confidence

Good

Weather Forecast

Sunday: Mainly cloudy with sunny breaks and a chance of flurries. Temperatures should remain cool during the day but an above freezing layer (AFL) is expected to develop late in the day. Winds are moderate to strong from the northwest.Monday: Mainly sunny. The AFL strengthens with alpine temperatures expected to reach +5. Winds remain strong from the northwest.  Tuesday: Mainly cloudy with a chance of precipitation. The AFL should dissipate but the freezing level remains relatively high at 1600-1800 m. Winds remain strong from the northwest.  

Avalanche Summary

There are no new natural avalanche reports. Explosive control work near highway corridors over the past couple days produced several avalanches up to size 3.5. Some of these slides released on the late December surface hoar or facet layer and propagated widely.

Snowpack Summary

Northerly outflow winds have produced new wind slabs in exposed lee and cross-loaded terrain. 60-90 cm of storm snow from last week continues to settle and gain strength. However, a weak layer of surface hoar or facetted snow sits at the base of the storm snow. Recent snowpack tests give generally moderate sudden planar, or "pops", results on this buried surface hoar layer and indicate potential for wide propagation. Near the base of the snowpack, a crust/facet layer continues to concern local avalanche professionals. This weakness is unlikely to be triggered by a single person, but it remains possible with a very heavy load (e.g. cornice fall) or from a thin-spot trigger point.

Régions couvertes