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 due to wind slab and loose wet avalanche problems.

Problemi valanghivi

  • Wind Slabs

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

    Wind slab avalanches remain possible near treeline and above treeline mainly on NW-N-NE-E-SE aspects due to new snow and moderate to strong SW winds. Avalanche size up to D2 may occur.

    Identify the specific terrain features where unstable wind slabs may exist. Ridgetop areas below cornice features and wind pillows are the most suspect. Sensitivity to triggering is expected at stubborn today so don't let your guard down if you are not seeing much in the way of evidence of instability.

  • Loose Wet

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

    A loose wet avalanche problem is expected to continue today in most areas. Some of these loose wet avalanches may share some characteristics with storm slabs, especially in areas above the rain/snow line. This avalanche problem could occur on any aspect and may occur at upper elevations in addition to occurring at the mid and lower elevations. Avalanche size of D1 is expected with the isolated possibility of size D2.

    Expect trigger points at slope convexities and in steeper terrain. Use small test slopes to assess for this avalanche problem. Avoid complex terrain and long steep pitches where this instability is present. Downslope hazards such as cliffs and terrain traps could greatly magnify the consequences of being pushed around by a small avalanche.

Avalanche Discussion

* Numerous hybrid storm slab/loose wet avalanches (size D1) were intentionally skier triggered yesterday below treeline on NE-E aspects on Jakes Peak (West Shore Tahoe area). Similar instability was triggered by snowmobile near Blue Lakes (Carson Pass area).

* Wet surface snow was reported from Powderhouse Peak (Luther Pass area) with some skier triggered rollerballs present. Similar conditions were reported from Mt. Judah (Donner Summit area).

* Some unstable snowpit test results have been reported on top of the Feb 14 rain crust. In some areas, graupel remains on top of this crust.

Regioni coperte