Boletín de aludes

East Slopes North

Northwest Avalanche Center
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Peligro de aludes

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

Lo esencial

You can trigger avalanches in slabs of wind-drifted snow below ridges and wind-exposed features. Watch for blowing snow, and cracks shooting through the snow as signs of the danger. Expect a dramatic increase in avalanche danger overnight and into Thursday.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5

    Steer around steep, wind-loaded features and convex roll-overs in wind-loaded terrain. To identify wind-loaded slopes, look for actively blowing snow, cornice formations, and pillowlike drifts. Avoid steep slopes on leeward sides of ridges and below cliffs. Slabs previously formed Monday night and Tuesday. You may see more blowing snow forming fresh slabs on Wednesday.

    (12/22/2023)

    An example of fresh drifts with cracking in steep ridgeline terrain.  

    Photo: Willie Webster

Avalanche Discussion

Expect an intense and prolonged storm to impact the area starting Wednesday night. It will likely last well into the weekend and could bring very dangerous avalanche conditions.

On Tuesday, an observer reported 6" of new snow at the Silver Star trailhead and fresh wind-drifted slabs on Delancey Ridge. He reported some signs of instability in these fresh wind slabs. The snow from the past week was not as well bonded to the 12/20 crust as near the top of Washington Pass. The crust is about 1 foot below the surface on sun-exposed slopes. On shaded slopes, the crust is barely discernable. 

Near Blackpine Lake on Thursday, observers reported small avalanches failing on a layer of buried surface hoar. The distribution of the surface hoar is uncertain, though it could exist in other areas of the eastern mountains and foothills. The snowpack in the eastern portion of the zone is shallower and may hold more weak layers. Pay attention to red flag signs of instability, such as whumping collapses, and consider digging down to identify and layers of weak snow.

You can contribute to the avalanche forecast. Please let us know what you see in the mountains by submitting an observation. 

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