Bollettino valanghe

Eastside Region

Eastern Sierra Avalanche Center
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Pericolo valanghe

Tue
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto last year. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Wet snow avalanches remain a possibility below and near treeline, especially in the southern half of the region. You could find isolated wind slabs in the high alpine as strong to extreme winds blow cold, dry snow onto leeward slopes. Look for rollerballs, and wet, mushy snow at lower elevations, and blowing snow at higher elevations to alert you to these problems. When in doubt, stick to lower angle slopes to manage today's hazards. 

Problemi valanghivi

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    Last night was the poorest refreeze we've had in the current warming period. However, we're seeing strong to extreme winds and slightly cooler temperatures in the northern half of our region which will help limit warming today. The southern half of our forecast zone will continue to see mostly sunny skies and freezing levels up to 12,000'. Small Wet Loose avalanches remain a possibility, especially on slopes receiving direct sunlight. 

    Easterly aspects will warm first as the sun comes out this morning, followed by southerly and westerly aspects as the sun moves across the sky. Rocky areas, confined chutes, and slopes with shallow snow cover can exacerbate the effects of warming. Wet slides can initiate from a single point release and entrain heavy snow which can be very difficult to escape. Even a small slide can have high consequences, especially in exposed terrain and near terrain traps. The best way to manage Wet Loose avalanches is to travel early when the snow surface is colder. Time your trips to avoid crossing on or under very steep slopes in the heat of the day. Move to colder, shadier aspects before the snow surface transitions from dry to wet. Rollerballs and pinwheels are the first, most obvious warning signs of Wet Loose avalanches.

     

     

    (4/6/2025) Photo: Eastern Sierra Avalanche Center

    Wet Loose avalanche activity from 4/6/25. 

  • Wind Slabs

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

    Strong to extreme southwest winds may lead to wind slab development in isolated areas above treeline. Look for blowing snow, cracking, and stiff, hollow snow to clue you in to this problem. Be especially mindful of slopes just below ridgelines, leeward catchment zones, and confined gullies/chutes. Even a small slide in extreme terrain can have high consequences. Monitor for stiff, hollow snow today as you gain elevation and stick to lower angle slopes, or sheltered terrain to reduce your exposure. 

    Photo: Eastern Sierra Avalanche Center

    D1 wind slab in a confined gully, above treeline, 11,000', NE. Crown is up to 12". Ran about 100'. 

Avalanche Discussion

Our snowpack is still in a state of transition after new snow last week, and a few days of warming. Today, we have warm temperatures and wet snow problems at lower elevations, especially in the southern reaches of our forecast zone. Winds and slightly cooler temperatures in the northern half of our region may help keep these slopes cooler, limiting wet snow instabilities. At the highest elevations, we still have cold dry snow and winter like conditions. Strong to extreme winds today may blow this snow around and produce isolated wind slabs. It will be important to stay alert to changing conditions, and keep an open mind to both winter and spring related instabilities as you travel in the mountains today. 

 

 

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