Bulletin d’avalanche

Stevens Pass

Feb 8 – 9, 2019Northwest Avalanche Center
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Archivé · expiré 8 years ago

Danger d’avalanche

Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Expect very dangerous avalanche conditions with avalanches likely. Cold, dry snow, strong wind, and old weak surfaces are contributing to High Danger. Stay well out from under steep slopes and avoid avalanche terrain above treeline.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1

    You can trigger wind slab avalanches in open terrain at all elevations. Stay off of windward slopes 35 degrees and steeper. Steer around wind pillows and drifts. With drifts forming on old, weak snow, wind slab avalanches may be easier to trigger than you might expect. You may also be able to trigger these avalanches from further away than is typical.

    Strong and gusty east wind with plenty of light dry snow will efficiently build slabs. Expect wind drifting below treeline at pass level. In less wind-affected areas, watch for triggering loose dry avalanches on slopes over 35 degrees.

Discussion

Snow and Avalanche Discussion

An avalanche warning has been issued for the neighboring East Central zone. A cold and gusty storm is impacting the Cascades. New snow and drifts are forming on weak old snow surfaces and slick crusts. You can trigger loose dry avalanches in wind-sheltered terrain, below treeline.

Cold temperatures have been weakening the upper snowpack. Observers have reported widespread weak facets and surface hoar at the surface prior to the storm. We’ve also received reports of some lingering interfaces in the top 2 feet of the snowpack. Expect the coldest temperatures of the season. Bring plenty of warm layers and take precautions against exposure to the cold and wind.

Snowpack Discussion

Regional Synopsis coming soon.

Régions couvertes