Boletín de aludes

West Slopes North

Northwest Avalanche Center
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Peligro de aludes

Tue
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 3 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Steep rollovers or other types of unsupported terrain above treeline are where you can trigger a slab avalanche. Use planar and/or lower angle slopes to navigate around these features and reduce risk. Morning sun could initiate wet avalanche activity.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    As the latest batch of wind slabs stabilize, the places where you could trigger one become more scattered. Common trigger points are directly under top and cross-loaded ridges, on convex rollovers and gully walls, or around cliffs and rock outcroppings. Slab avalanches should generally be small, but cornice fall could trigger a larger slab where a single person might not.

    Anticipate more and larger wind slabs in other parts of West North, especially near the Cascade Crest (Ruby Mt, Hidden Lakes, etc). These areas saw stronger east winds Saturday.

    Look for recently scoured ridgelines and other wind affected features to identify the pattern of wind loading in the terrain around you. Test slopes and hand pits can help you monitor differences in layering as you change aspects and gain elevation. Evaluate the bond of wind slabs and ease into steeper terrain - or just find a lower-angled line around features where you are more likely to trigger one.

    Example of small wind slab avalanche in wind affected, alpine terrain.

Avalanche Discussion

Small wet loose avalanches were reported Sunday around Canyon Creek and the Baker Backcountry. Warmer temperatures and more sun than forecast triggered rollerballs and avalanches on solar slopes. Also worth noting is it was the first day since February 21st with near or above freezing temperatures. at 5000'.

The sun should make a return Monday morning. Take note of the amount of warming and give some space to steep slopes that show signs of instability like rollerballs. 

The 2-3’ of recent snow has seen significant settlement in the last few days. Dry loose avalanches are less powerful but are still running fast. Expect to see some snow moving with you in very steep terrain. 

Two cornice fall triggered slab avalanches were the most notable events over the weekend (obs, obs). Cornices grew large and unstable in the past month with colder temperatures, plenty of snowfall, and wind. These avalanches are a sign cornices are a hazard to backcountry travel for the rest of the winter and spring.

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