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
1 · Debole
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Non aggiornato — questo bollettino è scaduto 8 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

MODERATE avalanche danger still exists in near and above treeline terrain, due to the possibility of lingering wind slabs. Human-triggered avalanches may remain possible today. Create a plan with safety margins to avoid the avalanche problems and maintain awareness of the conditions and terrain to stick to these safety margins while traveling in the backcountry.

Problemi valanghivi

  • Wind Slabs

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

    Yesterday's storm did create some wind slabs on wind-loaded N-NE-E aspects and possibly some cross-loaded NW and SE aspects in near and above treeline terrain. Most of these wind slabs remain relatively small and do not extend very far away from the ridgelines. However, some uncertainty exists as to whether larger ones with enough snow to bury or injure a person could still be lurking in some of the most heavily wind-loaded areas. These wind slabs exist on top of a weak layer of old surface snow and human-triggered wind slab avalanches may remain possible today.

    Avoiding wind-loaded areas where fragile wind slabs may exist represents a great safety margin for today. Planning to recreate in more sheltered terrain will also help take advantage of the soft unconsolidated snow. Maintain awareness of the conditions and terrain by looking for signs of wind-loading like cornices above a slope, blowing snow, or wind created textures on the snow surface.

  • Wet Slabs

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

    Some small, easy to manage, and mostly inconsequential loose dry sluffs could occur on steep slopes today as the new snow slides off of the old weak surface snow. However, some isolated sluffs could involve enough snow to interfere with a person's balance which could have consequences in more serious terrain.

Avalanche Discussion

* Yesterday observations found small wind slabs along wind-loaded ridgelines on Castle Peak and on Silver Peak. In both areas, the wind slabs did not extend very far downslope. On Silver Peak ski kicks could trigger small wind slab failures. The largest of these measured about 1 ft deep at the top and extended about 10 to 20 ft from the ridgeline.

* In sheltered terrain yesterday, ski cuts could trigger small inconsequential loose dry sluffs on steep test slopes on Silver Peak.

* At lower elevations, observers found a thin rain crust at the base of the yesterday's new snow on Silver Peak and on Castle Peak. 

* Early season conditions still exist with lots of obstacles on or near the snow surface in many places.

Regioni coperte