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

Avalanche danger should remain LOW for all elevations and aspects again today. Some small loose wet avalanches may become possible on isolated terrain features on slopes 35 degrees and steeper. While larger loose wet avalanches and wet slab avalanches remain unlikely, they are not impossible. Use normal caution when traveling in the backcountry.

Problemi valanghivi

  • Loose Wet

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

    Despite overnight temperatures in the 40's, mostly clear skies should have allowed the snowpack to radiate enough heat for a weak overnight refreeze. Areas north of I-80 where some cloud cover existed last night may not have refrozen. Today's sunny skies and warm temperatures will quickly melt the refreeze, and wet snow instabilities will become possible on all aspects and at all elevations as soon as the refreeze thaws. Human triggered roller balls and pinwheels should represent the majority of the wet snow instability, but some isolated loose wet avalanches may also become possible. In most areas these wet snow issues should remain small and not involve much snow, but isolated larger loose wet avalanches may be possible especially in areas where cloud cover prevented any refreeze last night. Wet slab avalanches remain unlikely, but they are not impossible.

Avalanche Discussion

Yesterday on Red Lake Peak, northerly aspects above 8500 ft. still held some soft cold snow. In areas below 9500 ft, this soft cold snow only measured a few inches in depth and rested above a very thick and frozen rain crust that wind scouring had exposed in many places. Above 9500 ft. firm wind packed surfaces mixed with areas of softer surface snow existed on the northerly aspects. Snowpit data and general observations did not reveal any signs of instabilities on the northerly aspects.

E-SE-S-SW aspects softened quickly, and some small skier-triggered roller balls and pin wheels did occur on sun-exposed E-SE aspects at around 1 pm. The snow on these aspects had almost been through enough melt-freeze cycles to become corn. It still remained slow and sticky in many areas and will take a few more melt-freeze cycles to fully transition.

Regioni coperte