Bollettino valanghe

Central Cascades

Central Oregon Avalanche Center
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Pericolo valanghe

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

In sintesi

You could trigger a small avalanche in wind drifted snow near and above treeline. Larger avalanches will also be possible on isolated features. Avoid steep slopes if you start to see shooting cracks, large drifts, and/or blowing snow.

Problemi valanghivi

  • Wind Slabs

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

    On Saturday I observed a skier triggered wind slab (D1.5) that propagated 400ft across and ran 150ft down slope. This occurred on a northeast aspect at 7,600ft. The crown was 18” (45cm) deep, and the slab ran on the old melt freeze crust layer. I was surprised by the size of the avalanche given the modest amounts of recent snow.

    For Sunday human triggered avalanches will continue to be possible. While most wind slabs will be small, larger avalanches may be possible (especially in the alpine) on isolated terrain features. Look for the usual clues such as blowing snow, textured snow surface, smooth/rounded features, cracking, and collapsing. Wind slabs can often be found below cornices, areas that catch snow, and anywhere the wind can freely blow snow. You can use your ski pole or avy probe to assess the depth of wind slabs. The old crust layer is a good land mark to assess the depth of wind slabs. While most wind slabs will be small, remember that getting knocked off your feet in and around terrain traps can make the outcome of a small avalanche worse (i.e. cliff, gulley, trees).

    If in doubt, stick to slopes under 30 degrees.

Avalanche Discussion

On Saturday morning I found low visibility and light snow fall in the alpine. There certainly was some rime as well. At ridgeline, winds were moderate with strong gusts. I observed consistent wind loading on lee aspects. The snow surface was variable with areas of blown in fresh snow and scouring to the old melt freeze crust layer.

Regioni coperte