Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Sun
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 8 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

You could trigger an avalanche today where unstable snow lingers in recently wind loaded areas. Areas that filled in with wind drifted snow along the downwind side of ridgetops and in gully features are the main slopes of concern for today. Move cautiously around slopes adjacent to or below cornice features, wind pillows, and any areas filled in by wind drifted snow.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Unstable snow is expected to linger today in places that were filled in with blowing and drifting snow. Use clues of recent drifting such as cornice formations, wind pillows, snow surface texture, scoured vs load side of ridgetops, and snow surface cracking to identify slopes of concern. Move around these areas with caution or consider avoiding them. Less avalanche hazard and potentially better powder conditions exist on wind protected slopes below treeline.

    The recent storm snow appears to have bonded well to itself in wind protected areas, leaving the greatest potential for lingering instability in wind loaded terrain. This has prompted the change from yesterday's storm slab problem to today's wind slab problem. Observations from yesterday noted a fair bit of variation in the ease of triggering slabs in wind loaded areas. Evaluate each wind loaded slope carefully, anticipating some variation of stability from one to the next.

    Dec 26: Small wind slab failure intentionally triggered on a test slope. Carson Pass area, CA

    Photo: David Reichel (SAC Pro Observer)

Avalanche Discussion

The recent storms built a fairly deep snowpack in a short amount of time and were preceded by large amounts of rain. As a result, there are numerous, deep open holes around creek beds and other areas of ponding. These holes and open areas are especially prominent below about 8,000', but have been observed at higher elevations.

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