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
2 · Moderato
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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 exists at all elevations today mainly due to loose wet avalanche problems. An unlikely but not impossible wind slab problem may still linger in some isolated places as well.

Problemi valanghivi

  • Loose Wet

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

    Warmer temperatures, strong sunshine, and less wind should allow enough warming for loose wet avalanches to become possible today. These could be small or large enough to have more serious consequences for backcountry travelers. Larger loose wet avalanches could occur on long, steep, sun-exposed slopes. Any size loose wet avalanche could be problematic in areas where terrain traps magnify its severity. As more daytime warming occurs, this problem will become more widespread. 

    Wet surface snow, pinwheels, and roller balls can foreshadow larger loose wet avalanches. Moving to more shaded and sheltered northerly aspects can help find colder soft snow and reduce exposure to avalanche concerns.

  • Wind Slabs

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

    Triggering a wind slab avalanche has become unlikely in the majority of areas. Unlikely does not mean impossible. A surprise wind slab failure cannot be ruled out in some isolated locations especially in complex or extreme terrain including couloirs, cliffy areas, unsupported slopes, and steep convex rollovers. Larger triggers like large cornice failures may also still be able to release an avalanche.

    Variable, challenging, firm, wind affected snow conditions will exist in areas where difficult to trigger wind slabs may still linger. Avoiding these less fun snow conditions in favor of the softer snow that should still remain in more sheltered terrain could provide more enjoyable recreation and help avoid potentially unpleasant wind slab surprises.

Avalanche Discussion

* Yesterday observations from the Incline Lake Peak area revealed firm wind slabs on multiple aspects. Tests on the newer wind slabs still yielded some unstable results. Tests on the older wind slabs did not show signs of instability. All observations indicated that these wind slabs are becoming more difficult to trigger.

* In sheltered areas no signs of instability existed. Cold soft snow still lingered on northerly aspects. On sun-exposed southerly and easterly aspects heavier snow existed above older sun crusts by mid-afternoon but no wet snow instabilities were observed.

* A natural avalanche occurred on Jobs Sister. It was seen from a distance and details about its size, trigger, and type remain uncertain. It may have been triggered by rockfall. 

Regioni coperte