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 will exist at all elevations with wind slab and loose wet avalanche problems.  Periods of intense sunshine along with rapid warming could increase the amount of avalanche activity today.  Avalanche danger is expected to rise tomorrow as another storm impacts our forecast area.

Problemi valanghivi

  • Wind Slabs

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

    Wind slabs and cornices will remain reactive on NW-N-NE-E-SE aspects in near and above treeline terrain.  Strong SW winds will continue through today at the upper elevations transporting snow and adding to existing wind slabs and cornices.  In sun exposed areas, wind slab avalanches could become weak and take on wet slab characteristics.  Large wind slab avalanches that have formed during this storm cycle still have the potential to be human triggered.

    Look for blowing snow, cornice formation, and wind pillows.  Make a plan with your group to avoid wind loaded terrain and areas below large cornices.

  • Loose Wet

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

    For areas that see intense March sunshine and rapid warming today, loose wet avalanches will become possible on all aspects and elevations.  Most loose wet instabilities are expected to be in the form of roller balls and pinwheels and be small in size (D1).  Larger loose wet avalanches (up to size D2) will be possible if intense solar radiation occurs.

    Monitor cloud cover and temperatures throughout your tour.  Wet, heavy, surface snow along with roller balls or pinwheels will indicate that the snow surface is warming and loosing strength.  Change aspects or move to different terrain if rapid warming is occurring.    

Avalanche Discussion

* Wind transported snow was seen on Mt. Judah (Donner Summit area).  Large cornices and wind slabs were sensitive to the weight of a skier.  Wind slabs were up to 2' deep with ECT-P's on wind loaded test slopes.

*  Wind loading was observed along Frog Lake Ridge in the Carson Pass area.  Multiple layers of graupel were identified in the recent storm snow, both showed limited signs of instability with snowpack tests.

* Tree bombing, rollerballs, small loose wet avalanches, and rain runnels were noted yesterday, mainly below 7000'.

* Cornices continue to be large, fragile, and break off easily.

Regioni coperte