Bollettino valanghe

Northwest Coastal

Dec 21 – 22, 2012Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 14 years ago

Pericolo valanghe

Sun
Mon
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    Light amounts of new snow have been redistributed by strong winds into wind slabs on a variety of aspects. These new wind slabs are adding to older storm snow accumulations which have most likely gained considerable strength.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–5
    A persistent weak layer of surface hoar, buried 60-80 cm below the surface has been reported from around Shames. Although triggering seems less likely, watch for convex rolls in sheltered areas where the SH may have been preserved.

Weather Forecast

Saturday: Mostly clear skies / Moderate southeast winds / Temperature inversion with ridgetop temperature of -12.0Sunday: Mostly clear skies with trace amounts of new snow / Moderate southeast winds / Temperature inversion with ridgetop temperature of -13.0Monday: Trace amounts of new snow / Light southeast winds / Ridgetop temperature of -16.0

Avalanche Summary

An explosives controlled size 2 cornice fall/ windslab was reported from the region on Thursday. No other avalanches have been reported.

Confidence

Fair - Due to limited field observations

Snowpack Summary

Light amounts of new snow have been redistributed by winds at higher elevations. This overlies the past week's storm snow which has most likely settled and gained significant strength. A buried surface hoar layer, reported to be 5 to 10mm thick, has produced sudden snowpack test results down about 80cm in the Shames backcountry, and may exist in other areas too. Avalanche professionals continue to monitor a faceted crust near the ground which has been reactive this week in the Bear Pass area. It seems this problem is confined to alpine areas and likely needs a large trigger and/or a shallow snow pack feature to trigger. Cornices are also really big and forecast strong winds and cooling temperatures could make them especially heavy and brittle.

Regioni coperte