Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Mon
Alta quota
4 · Forte
Limite del bosco
4 · Forte
Sotto il limite
4 · Forte
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In sintesi

A high intensity storm is expected to deposit around 3 feet of new snow above 7,000' over the next 24 hours. This combined with strong winds and warming air temperatures will make natural avalanches very likely today, tonight, and early tomorrow morning. Travel in, near, or below avalanche terrain is not recommended.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–2

    The combination of snowfall rates around 2 to 3 inches per hour today and warming air temperatures are expected to rapidly create upside-down layering within today's new snow. Storm slab avalanches are very likely today in wind protected areas below treeline. Avalanche size will quickly increase as the morning progresses.

    If traveling non-avalanche terrain today, pay close attention to slope angles. Keep travel limited to slopes that are well below the 30 degree slope angle threshold for avalanche terrain and without steeper connected terrain above or to the side.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3

    In isolated areas along the eastern side of the forecast area, there remains relatively weak, faceted (sugary) snow in the lower portion of the snowpack. This storm may deposit enough new snow load to the eastern side of the forecast area to cause failure of this old snow near the base of the snowpack. Any deep persistent slab avalanches that occur have the potential to be long running, large, and destructive.

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1.5–3

    High intensity snowfall combined with SW wind will rapidly load new snow onto the downwind side of ridgetops and into gully features. New wind slabs will form on top of existing wind slabs that were reactive yesterday. Some avalanches could become fairly large over the next 24 hours, potentially depositing debris down near the valley floor.

    If traveling non-avalanche terrain today, expect poor visibility. Plan your method for avoiding exposure to avalanche terrain above you when you cannot see it.

    (2/3/2024)

    A skier was caught and injured in this avalanche yesterday. Red Lake Peak, Carson Pass area, CA

Avalanche Discussion

Several slab avalanches were reported yesterday in the D1 to D2 size range. These were very soft slab avalanches, mainly in areas that had received some wind loading. Avalanches were observed to fail within the recent new snow, a few inches above the melt-freeze crust buried on Jan 31.

Some rain on snow could occur below about 6,500' today, creating some wet snow avalanches.

Regioni coperte