Bulletin d’avalanche

Northwest Coastal

Jan 7 – 8, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    New snow and wind will likely create fresh new windslabs. The new snow will also hide older windslabs formed by northwest winds a few days ago.

  • 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. Try to get local knowledge if you are traveling to new areas.

Confidence

Fair - Intensity of incoming weather systems is uncertain on Wednesday

Weather Forecast

Wednesday: Light to moderate snowfall / Moderate southwest winds / Freezing level at 700mThursday Heavy snowfall arriving late in the day / Strong to extreme southerly winds / Freezing level at 600mFriday: Light to moderate snowfall / Moderate westerly winds / Freezing level at 600m

Avalanche Summary

In recent days a few slab avalanches to size 3.5 were noted in alpine terrain in the far north of the region. They were suspected to have failed on basal facets. I would expect a new round of storm slab activity with weather forecast for the next few days.

Snowpack Summary

In general the snowpack seems shallower and more faceted in the northern part of the region, and deeper with more wind slab problems in the south. At 1300m on an east aspect in the Shames area the height of snow was about 190cm. Very light amounts of new snow now overlie a variety of old surface which include: settled storm snow, surface hoar in sheltered locations, and wind slabs at upper elevations. About 30cm below the surface you may find several laminated thin melt/freeze crusts. Moderate sudden planar shears were experienced in snowpack tests down about 40 cm in a weak facet layer that is sitting above a melt/freeze crust from Christmas. Deeper early December facetted crystals were found to be rounding and gaining strength in this area.

Régions couvertes