Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 7 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

MODERATE avalanche danger may still exist in near and above treeline terrain due to the possibility of lingering wind slab problems. Human triggered avalanches may remain possible today. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1

    Some slabs of wind drifted snow formed on leeward slopes as a result of recent snow and wind. These small wind slabs should be more difficult to trigger today as the new snow settles and bonds to the snow below it. Still, a human-triggered avalanche may remain possible especially in complex or extreme terrain (like couloirs, cliffy areas, unsupported slopes, and steep convex rollovers) or on a heavily wind-loaded slope. Most of these wind slabs should remain small, but an avalanche large enough to have serious consequences is not impossible. 

    Look for clues like cornices above a slope, drifted snow, or wind created surface textures to help identify where lingering wind slabs may exist. Some of these may be covered with a small amount of new snow making them more difficult to identify. Smooth slopes without previous tracks in sheltered areas may provide more consistent recreation conditions.

Avalanche Discussion

* Wind slabs were reported on Castle Peak, Rubicon Peak, and Tamarack Peak yesterday. These remained mostly small and limited to areas near ridgelines. A ski cut on a test slope on Castle Peak produced a small slab failure that started as more of a loose wet sluff and then broke more like a slab once the skier reached a convex rollover. Ski cuts also released a very small pocket of wind-loaded snow on Rubicon. Ski kicks and cuts produced cracking on wind-loaded test slopes in all three areas.

* Wet sticky snow existed in some places in all three areas. On Rubicon, it was limited to below 8000 ft; on Castle, it was more widespread; and on Tamarack, it formed on slopes that received a small amount of sun in the afternoon. 

* A refreezing crust existed below the new snow. At lower elevations, it remained soft. At upper elevations, it was firmer and more supportable.

Regioni coperte