Bulletin d’avalanche

Northwest Coastal

Jan 10 – 11, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    A weak layer of buried facets near the ground continues to be a concern in the north of the region. Watch for increased triggering in unsupported terrain with a variable or shallow snowpack.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Moderate snowfall and forecast strong winds overnight Friday will add to a developing storm slab. Watch for increased reactivity in wind-exposed terrain.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

Overnight and Saturday: Moderate snowfall occurring overnight and Saturday morning / Strong to extreme variable winds / Freezing level at 500mSunday: Moderate to locally heavy snowfall / Strong to extreme southwest winds / Freezing level at 1000mMonday: Light snowfall / Strong west winds / Freezing level at 700m

Avalanche Summary

In the Bear Pass area a size 2.5 storm slab and isolated wind slabs to size 1.5 were observed. Warm temperatures promoted several size 1 loose wet avalanches in steep low elevation terrain close to Terrace. I expect a new round of wind slab activity with weather forecast for Friday night.

Snowpack Summary

The snowpack seems shallower and more faceted in the northern part of the region, and deeper with more wind slab problems in the south. Professionals in the area note there is much more snowcover variability this year compared to most years.Around the Skeena corridor 10-25cm of recently fallen snow overlies a variety of old surfaces which include surface hoar in sheltered locations, and wind-affected snow at upper elevations. Wind data suggests the new snow has most likely been pushed into wind slabs in exposed terrain. Depending on your location, you may find a facet/crust combo or surface hoar about 60cm below the surface. Reports suggest these layers are gaining strength; however, they may be worth keeping an eye on with forecast storm loading over the next few days. Below this, the mid and lower snowpack layers are mostly thought to be strong and well bonded in this area.

Régions couvertes