Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Thu
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
3 · Notable
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Desactualizado: este boletín caducó 4 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Backcountry travelers remain at risk of triggering large, high consequence avalanches. Travel with caution in the vicinity of avalanche terrain, remembering that recent avalanches have been triggered from substantial distances away, often from the side or from below avalanche terrain.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    2–3

    We've made it through two days with no reported avalanches. Unfortunately, that is not long enough to call this avalanche cycle over. It is common for persistent slab avalanches to continue to occur during periods of calm weather and after days of no avalanches. The daily reports of snowpack collapses, whumphing noises, and unstable snowpit test results tell us that the instability is still out there.

    The Dec 1 persistent weak layer remains most concerning on NW-N-NE aspects where it is buried under 1.5 to 4 feet of snow. Avalanches that have occurred on this weak layer have had a minimum size of D2,  had wide propagation, wrapped around terrain features, and have been triggered from up to several hundred feet away.

    At this point in the avalanche cycle, the most likely signs of unstable snow in your immediate area are collapsing of the snowpack with or without an audible whumphing noise and/or unstable snowpit test results. If you want to decrease your likelihood of becoming caught in an avalanche today: 1) Limit your travel only to slopes less than 30° in steepness without connected steeper terrain above or to the side. 2) Move through terrain anticipating that any avalanches triggered will be wider than expected and run longer downslope than expected. 3) Keep in mind that previous tracks on a slope are no indication of stability for this type of avalanche problem. I won't be surprised to hear about an avalanche that takes out previous tracks.

    (12/6/2022)

    Partially filled in avalanches on NE aspects of a peak between Silver Peak and Poulsen Peak. Pole Creek area, CA.

    Photo: Andy Anderson

Avalanche Discussion

  • Moisture has increased in the faceted Dec 1 PWL in most locations below 7,500' to 8,000'.  Snowpit test results and the frequency of snowpack collapses in these locations are becoming increasingly variable from one area to the next.
  • The faceted weak layer remains dry in most locations above 8,000' with snowpit tests and more frequent snowpack collapses continuing to provide clear indications of instability.
  • Check out the observations page for more details.

Regiones cubiertas