Bollettino valanghe

Stevens Pass

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

 You could trigger small avalanches where the wind drifts snow near high elevation ridges. Expect light snow with stormy conditions intensifying near dusk. The avalanche danger will increase sharply on Sunday night.

Problemi valanghivi

  • Wind Slabs

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

    If traveling in alpine terrain, expect to find small wind slabs on exposed features, especially on leeward sides of ridges. Check for warning signs such as stiffer, deeper snow, shooting cracks, and active wind transport. Steer around steeper slopes with cornices or thicker drifts nearby.

    While recent snow may be difficult to trigger in moderately steep terrain, it could slide easily on slopes 40 degrees and steeper, especially where it sits on a firm crust buried on the 30th. New snow and wind may add fresh slabs on Sunday. Winds have been strong enough to drift snow into localized areas where you may be able to trigger small avalanches. 

    Example of small wind slab avalanche in wind affected, alpine terrain.

Avalanche Discussion

Light snow will fall through the day, intensifying near dusk on Sunday. New snow will come in moist at all but the upper elevations where winds will also be strong enough to transport snow. Expect a significant increase in avalanche danger Sunday night into Monday as snow and wind increase.

On Friday, the sun warmed snow surfaces and wet avalanches ran naturally on steep sunny slopes in the 4-6" of snow that accumulated since Wednesday.  Observers were able to trigger wet avalanches on sun-exposed slopes of Lichtenberg Mtn. Surfaces may have also warmed on Saturday with cloud breaks. On Thursday, I found about 5 inches of recent snow and small, localized drifts about 1 foot deep on Lichtenberg Mtn. I was able to trigger shallow wind slab and loose avalanches on a firm, old crust in very steep terrain. 

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