Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 11 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Avalanche danger is LOW for all elevations and aspects. Small isolated pockets of instability may linger both above and below treeline due to recently formed wind slabs and storm slabs. Normal caution is advised. Travel one at a time while in or below avalanche terrain. Avoid grouping up in marginal islands of safely or in avalanche run out zones. Maintain situational awareness and recognize the boundaries of avalanche terrain while on the fly.  

Problemi valanghivi

  • Cornices

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

    Stubborn, difficult to trigger wind slabs are widespread in near and above treeline areas on NW-N-NE-E-SE aspects. Evaluate carefully any areas of recent wind loading, especially in complex terrain and near or above cliff bands. Wind slabs generally have visually discernable boundaries constrained by terrain features. Communicate with your partner(s) and know where the slab boundaries are.

    Areas of problematic facets at the base of the snowpack near treeline and below treeline on NW-N-NE aspects are becoming increasingly few. However, unintentionally finding an isolated pocket that has remained unstable could certainly ruin your day. The overall snowpack is only 2-3 feet deep (or less) in most areas so evaluation requires little effort. A quick pole probe or boot post hole and subsequent hand pit will identify if you can make a snowball out of the softer snow at the base of the snowpack. It you find sugary grains that poorly form into a snowball, reevaluate your terrain choice.

Avalanche Discussion

Observations made yesterday on Silver Peak (Pole Creek area), Rubicon Peak (West Shore Tahoe area), as well as those received from a partly on Red Lake Peak (Carson Pass area) all pointed towards minimal evidence of instability. Winds slabs in near and above treeline areas did not react to ski cuts or provide unstable results in snowpit tests. Snowpit data collected yesterday on Silver Peak and Rubicon Peak as well as recent snowpit data from the Donner Summit, Mount Rose, and Carson Pass areas (more info below) have all indicated increasing strength within what was faceted snow crystals located either at the base of the snowpack or within the snowpack near treeline and below treeline on NW-N-NE aspects. Significant warming, rounding, and a decrease in unstable snowpit test results has been observed within these layers over the past few days.

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