Bulletin d’avalanche

East Slopes South

Northwest Avalanche Center
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Danger d’avalanche

Wed
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Steep rollovers or other types of unsupported terrain with recent wind loading are where you are most likely to trigger an avalanche. Observations of active wind loading or signs of instability like whumphing or shooting cracks are a signal to switch to a more conservative plan for the day.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    Small wind slabs still present some risk in steep, exposed terrain above treeline. Identify slopes holding wind slab by looking for changes in snow stiffness or visual clues like cornices and wind-scoured ridgelines that indicate where the wind redistributed snow into deeper drifts.

    You are most likely to trigger one of these avalanches on terrain features like convex rollovers, gully walls, or around cliffs and rock outcroppings. You can evaluate the bond of wind slabs using simple slope tests or hand shears - or simply bypass steep wind loaded features on lower angle, planar terrain.

    Heavy precipitation last week fell as snow instead of rain at upper elevations as well and a layer of buried surface hoar may have survived. Assess snowpack conditions if you get up that high in the mountains Tuesday. 

    Scoured or eroded snow surfaces are a telltale sign the wind has been at work stripping the snow from upwind slopes and depositing it into slabs on the other side of a ridge.

    Photo: Julz Holder

Avalanche Discussion

Loose wet avalanches could still initiate with near or above freezing temperatures and a round of sunshine. Look for the usual signs of instability like wet, unsupportable snow surfaces, rollerballs or very small avalanches. Stay off and away from steep slopes if you observe any of the above in your travels. Also, keep an eye on cornices or other overhead hazards and anticipate the consequences of low-likelihood hazards. 

Be prepared for challenging off-trail travel at lower elevations. Breakable crusts, wet snow, open creeks, and other obstacles are additional hazards to factor into your day.

Régions couvertes