Bollettino valanghe

Central Cascades

Central Oregon Avalanche Center
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Pericolo valanghe

Sun
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 2 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Triggering avalanches will be likely in areas where wind blown snow has accumulated with the potential for large avalanches. Triggering avalanches will be possible in the recently accumulated storm snow on slopes where the wind has not scoured it away. You can minimize your exposure to avalanches by sticking to low angle slopes less than 30 degrees. 

Problemi valanghivi

  • Wind Slabs

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

    As new snow comes in, the wind will be moving it to lee terrain. Observe where blowing snow is moving and where that snow is landing. Look for visual clues to such as ripples in the snow or pillowy drifts to identify loaded slopes. Below ridges and highpoints are common places where wind slabs can be triggered. As wind moves snow across open slopes, gully features in particular can become 'cross loaded' and filled in with new wind slabs.  Cracking in the wind deposited snow and recent avalanches are good indicators that you can trigger an avalanche. Wind slabs can be avoided by sticking to sheltered areas or slopes that have been scoured by the wind. 

    Use carefull evaluation in areas of sparse trees, clearings, and sections of dead forests. Open areas 'below treeline' can get enough blowing snow to create wind slabs.

  • Storm Slabs

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

    Cold light snow will come in overnight with heavier snow coming in on Saturday as the temperature rises. This has the chance to create a classic heavy over light snow situation making storm slabs possible. The high end of the snow forecast calls for 13" by Saturday afternoon. If we see 8" or more of new snow, be cautious on steep slopes and above or around terrain traps. Look for small steep test slopes you can utilize to check for slabs moving or other signs of unstable snow before going into bigger and steeper terrain.

    Small dry loose avalanches will be possible in the morning in steep terrain.

Avalanche Discussion

Cornices will build at ridgetops. Be cautious when approaching the lee side of ridges. New cornices are fragile and easy to break through if you step out onto them. 

 

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