Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 9 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

LOW avalanche danger may only exist for a brief period early this morning due to little to no overnight refreeze. As the day warms up, the avalanche danger will quickly rise to MODERATE as loose wet avalanches become possible. Evaluate snow and terrain carefully and move to less steep slopes or change activities once the snow becomes wet and unsupportable. Avoid slopes below large cornices and glide cracks. 

Problemas de aludes

  • Loose Wet

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

    Above freezing overnight temperatures and some overnight cloud cover should lead to a weaker overnight refreeze. While today's cloud cover and strong winds may slow down the melting process, it will not take much to melt through last night's weak refreeze. Loose wet avalanches will become possible again today once the refreeze melts. Expect deep wet unsupportable snow on slopes early in the day especially on the sun-exposed E-SE-S-SW-W aspects and on some northerly aspects as well. Most loose wet avalanche activity should remain smaller today, but larger loose wet activity is not impossible. If any areas receive rain, loose wet activity will be more widespread in those areas. 

    Once the snow becomes wet and unsupportable, it is time to move to a different aspect where colder snow exists or switch activities to avoid the wet snow. 

    In addition to the wet snow potential, large cornices still exist above many slopes and glide cracks have opened on some steep slopes. Numerous cornice collapses have occurred during the warm weather, and some have triggered loose wet avalanches large enough to bury a person. It is very difficult to predict when these cornice failures will occur or when glide cracks will release as glide avalanches. Due to their size, unpredictability, and serious consequences, it is best to avoid areas below glide cracks and large cornice features during any warm periods.

Avalanche Discussion

Observations on Prosser Hill, Rose Knob Peak, and Echo Peak showed a mild overnight refreeze in open areas that softened to spring corn snow conditions in the 9 to 10:00 am time range yesterday. By 10:00 to 11am, the refreeze became unsupportable below 8500 ft. with knee deep wet snow on Prosser Hill, low elevations of Rose Knob Peak, and on Echo Peak. Numerous large cracks, sagging cornices, and cornice collapses were noted in the Echo Peak and Rose Knob areas as well. 

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