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

In sintesi

The avalanche danger remains LOW on all elevations and aspects. Small wet snow instabilities may form in isolated areas due to daytime warming. Continue to use normal caution and practice safe travel habits when traveling in the backcountry.

Problemi valanghivi

  • Cornices

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

    Some small wet snow instabilities like roller balls, pinwheels, or small wet loose sluffs may from today on some sun-exposed slopes. Some cloud cover combined with low sun angles, some light north winds, and some overnight refreezing should prevent larger wet snow instabilities from forming. In other more shaded areas a strong well bonded snowpack with a weaker snow near the surface and no slab above this weaker snow exists. As a result of the limited warming and lack of slabs above the potential weak layers natural and human triggered avalanches remain unlikely today. Unlikely does not mean impossible and small isolated areas of unstable snow could linger on isolated terrain features especially in complex or extreme terrain like couliors, gullies, areas around cliffs, or unsupported slopes. Practice safe travel habits like traveling one at a time in avalanche terrain and regrouping in safe zones. Other backcountry hazards remain including icy conditions on some exposed near and above treeline slopes and a shallow snowpack with lots of obstacles.

Avalanche Discussion

Yesterday observations on Silver Peak showed firm crusts on the near and above treeline slopes exposed to the N-NE winds and softer snow above an eroding rain crust on the more protected near and below treeline northerly aspects. In the Mt. Rose backcountry on Fireplug similar conditions with soft snow on top of a thin rain crust existed in the sheltered areas. On Tamarack Peak the rain crust on the scoured N-NE-E aspects has deteriorated into a thin variable crust that has become breakable in some places, supportable in other areas, and almost nonexistent in others. Below the rain crust a thin potential weak layer continues to form in all of these areas. Tests on this layer show that it remains mostly unreactive at this point. Snowpit data indicates a strong and well bonded snowpack below that thin weak layer. On sun exposed E-SE-S-SW-W aspects on Fireplug yesterday, several inches of wet, sticky snow had formed on the surface by 1 pm.

Regioni coperte