Boletín de aludes

Eastside Region

Eastern Sierra Avalanche Center
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Peligro de aludes

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

Lo esencial

A small Wet Loose avalanche, a falling cornice, or a person's weight could trigger a dangerous avalanche that breaks on buried weak layers in the snowpack. To mitigate this hazard, choose lower-angle slopes, avoid overhead hazards, and maintain wide safety margins. As temperatures climb, move to shady slopes before the surface snow gets too wet.

 

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3.5

    Persistent Slab avalanches are more sensitive to a person in the southern half of the forecast area and at lower elevations where the slab is thinner (3 feet or less). At higher elevations, particularly from Mammoth north, the slab is thicker (~4 to 6+ feet), and feedback may be unreliable. A very large avalanche could be the first sign a slope is unstable. A smaller wet loose avalanche, cornice fall, or the weight of a person in a rocky area with shallower snow cover, could be all that is needed to trigger an unsurvivable avalanche.

    Managing persistent slabs is difficult. They may be triggered remotely—from flatter terrain adjacent to steep slopes and from terrain people usually think of as safe. Persistent slabs often propagate widely and in unpredictable ways. Tracks on a slope do not mean that it’s safe. Shooting cracks and collapses are clear warning signs of the problem. However, feedback is often irregular. The best option is to minimize your exposure to steep terrain on the aspects and elevations with sugary facets buried under stiffer slabs. Use extra caution in rocky, complex terrain, near convexities, and on slopes with inconsistent snow depth.

     

     

     

     

     

     

    Photo: Eastern Sierra Avalanche Center

  • Loose Wet

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

    Our area saw mostly clear skies and below freezing temperatures overnight. However, freezing level will rise quickly today to between 10000' and 12000'. Expect it to be warmest in the southern part of our forecast area. Rapid warming will cause crusts to break down on solar slopes and for surfaces to become wet.

    As the snow continues to warm, rollerballs or pinwheels can be the first signs of instability. Sinking deeply into wet, mushy snow also means it's time to avoid being on or beneath steeper terrain. Wet Loose avalanches can entrain heavy snow that is difficult to manage or escape from. Wet Loose avalanches can also trigger larger slab avalanches that break into deeper snow layers. The best way to manage Wet Loose avalanches is to travel when the snow surface is colder and stronger. 

    (2/16/2025)

    Pinwheels in wet snow @ 8500', BTL, June Lake area. 

    Photo: Eastern Sierra Avalanche Center

Avalanche Discussion

Avalanche conditions vary across our diverse forecast area. Differences in the structure of weak layers in the snowpack, and diminishing signs of instability are sources of uncertainty. Regardless, the consequences of an avalanche failing deep in the snowpack are incredibly high. Patience and disciplined terrain choices are the antidotes to an uncertain snowpack. Low slope angles and low-consequence terrain are the best ways to avoid triggering a deadly avalanche.

 

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