Bulletin d’avalanche

South Coast Inland

Dec 21, 2016Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré

Points saillants

The last few days' new snow sits on a variety of potential weak sliding layers. As the storm snow settles in the coming days, it will be critical to evaluate the bond between new and old snow layers.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Moderate to strong southwest winds have created wind slabs in the lee of terrain features
  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    30-50cm of new snow sits on a variety of potential weak sliding layers.

Confidence

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

Weather Forecast

Wednesday: Cloudy with some sunny periods/ Moderate southwest wind / Alpine temperature -3Thursday: Flurries, accumulation 10cm / Moderate to strong southwest wind / Alpine temperature -4 Friday: Isolated flurries/ moderate north wind / Alpine temperature -5

Avalanche Summary

There are no new recent reports of avalanche activity, however I would suspect there to be continued potential for skier and rider triggering with the recent new snow, strong winds at upper elevations and a possible weak bond at the storm/old snow interface.

Snowpack Summary

30-60cm new snow overlies the previous variable snow surface from last week, which includes hard wind pressed or scoured areas, old wind slabs, weak faceted snow, or surface hoar. New wind slabs that have formed in response to southwest winds. In the Duffey Lake area, recent snowpack tests gave moderate sudden planar results down 50 cm on buried surface hoar. The widespread mid-November crust is typically down approximately 1 metre. Recent snowpack tests have shown the crust to be unreactive, but it could become a problem in shallow alpine start zones.

Régions couvertes