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 10 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

MODERATE avalanche danger continues for all elevations and aspects on slopes 35 degrees and steeper due to ongoing loose wet avalanche problems. Evaluate snow and terrain carefully. Identify and avoid steep terrain where unsupportable deep wet snow exists.

Problemi valanghivi

  • Loose Wet

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

    Loose wet avalanche activity became more widespread yesterday. Little to no snow surface refreeze is expected to have occurred last night with cloud cover and above freezing air temperatures. Some degree of sunshine and air temperatures in the 40s today will keep loose wet instability ongoing on all aspects at all elevations. The vast majority of today's instability is expected to take the form of loose wet avalanches, however isolated wet slab and glide avalanches are not impossible.

    Widespread areas of deep wet snow currently exist this morning and will continue to exist throughout the day today. Evaluate areas of wet snow for supportability. If in doubt, step off of equipment and observed the depth of body weight boot penetration into wet snow. Anything deeper than 8 to 10 inches is problematic. Avoid travel on or below slopes 35 degrees and steeper when unsupportable deep wet snow conditions are present.

Avalanche Discussion

Observations made yesterday on Tamarack Peak (Mount Rose area) revealed storm snow amounts ranged from 2 inches at 8,600' to 6 inches at 9,700'. New snow was evenly distributed on all N-NE-E-SE aspects traveled, indicating light wind during deposition. Storm snow was decently, but not particularly well bonded to wet snow at the old/new snow interface. Recent high elevation rain had created wet snow in the top 2 feet of the snowpack on N aspects at 9,700'. At slightly lower elevations, up to 3 feet of wet snow existed on N aspects. Testpit data collected on a N aspect at 9,700' revealed no signs of slab instability associated with the recent new snow. Loose wet conditions were prominent below 9,000'. Skier triggered roller balls and pinwheels occurred in terrain steeper than 35 degrees at 8,800' and below at 10:30 am. Additional reports of skier triggered loose wet avalanche activity during the afternoon hours were received from this area.

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