Bollettino valanghe

Eastside Region

Eastern Sierra Avalanche Center
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Pericolo valanghe

Wed
Alta quota
4 · Forte
Limite del bosco
4 · Forte
Sotto il limite
4 · Forte
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Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Very large natural and human-triggered avalanches remain likely today. Heavy snowfall, extreme winds, and deep snow around terrain traps continue to create very dangerous avalanche conditions. Traveling in or below avalanche terrain is not recommended.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1.5–3.5

    Very large natural avalanches are expected today in leeward avalanche paths that sit just below ridgelines near and above treeline. With good coverage at lower elevations, these avalanches could run down to valley floors and into low-angle or treed terrain you may typically think of as safe. Even careful route finding will not leave much of a safety margin today, the most straightforward strategy for managing overhead hazards from wind slabs is to avoid travel in avalanche terrain.

    Size 2 human-triggered wind slab in Redcone Bowl. 

  • Storm Slabs

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

    Up to 40 inches of dense snow accumulated in the last 24 hours and another 12+ inches is expected by this evening.  Avalanches breaking within the storm snow could be large enough to bury you deeply. Storm slabs are most likely to release on steeper slopes (greater than 35 degrees) at convex rollovers in the terrain. These avalanches will be most dangerous today on slopes that end in terrain traps.  Avoid flat benches or gully features where snow from slopes and banks above you could pile up and create a deep burial. The best way to manage storm slab hazard today is to stay out of avalanche terrain altogether.

    Beware of roof avalanches in mountain communities above 6500'.

    (12/4/2022)

    Deep debris from a small slope.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    3–3.5

    Recent heavy snowfall and wind loading are testing the strength of persistent weak layers at the base of the snowpack. A deep persistent slab is unlikely to be triggered by a person. However, it is possible that natural avalanches will step down, triggering even larger avalanches breaking near the ground. If triggered, deep slabs can propagate around terrain features that would otherwise confine new snow instabilities creating larger-than-expected avalanches. The possibility of these larger avalanches is another good reason to stay out of the run-outs of major avalanche paths.

    (1/7/2023)

    Crown line of a Natural D3 avalanche on a NE aspect at 11000' 20230107

Avalanche Discussion

Extreme snowfall events like this one are notorious for producing avalanches that surprise even professionals. Natural avalanches may run further than expected today due to deep snow covering obstacles and smoothing out terrain transitions in the tracks and runouts of avalanche paths. If you are leaving the house today, be careful of steep snow-covered slopes, large and small. Meadows adjacent to mountainsides and alleyways below roofs are good examples of terrain that may hold the potential for an accident today.

Weather impacts on highways and mountain communities will affect the availability and timeframe of backcountry rescue.

Deep snow also brings increased tree well danger. If out in the backcountry (or off-trail at a ski area) make sure you keep sight of your partner.

Regioni coperte