Bollettino valanghe

Central Cascades

Central Oregon Avalanche Center
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Pericolo valanghe

Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 5 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Wind slabs will build on lee slopes throughout Friday night and Saturday and will be likely to trigger. On some features, resulting wind slabs could be large. The conservative choice is to avoid any wind loaded slopes over 30 degrees. Use careful snowpack evaluation, cautious route-finding and conservative decision making.

Problemi valanghivi

  • Wind Slabs

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

    The wind will continue moving snow into Saturday and building wind slabs. Wind slabs are most sensitive to triggering while they are being formed and up to a day or two after. Wind slabs were reported as easily triggered on Friday near treeline, and I expect the same for Saturday. Watch for isolated pockets of wind slabs below treeline in clearings and in places where the wind is moving snow.

    Look for visual signs such as pillows of wind difted snow, and a wavy or uneven surface texture to indicate a surface may be wind loaded. Recently formed cornices can also be clues that wind slabs are present. Cracking in the new formed slabs on small test slopes is a good indication that you could trigger a wind slab avalanche in the right terrain. Wind slabs often form below ridge tops, high points, and features that catch blowing snow. 

     

  • Loose Dry

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

    The new snow is coming in cold and light. In areas with little wind affect on the snow, small dry loose avalanches will be possible especially in steep terrain.

Avalanche Discussion

On Friday there were reports of easily triggered wind slabs on north NE facing slopes near treeline. The wind has affected snow below treeline in places where it usually does not. Clearings, glades, and areas of sparse trees had wind affected snow on Friday. Although wind slabs below treeline will be isolated and small, it is something to watch for.

By Friday afternoon, the region had 20-30 cm of new storm snow sitting on the 02/22 crust.

Regioni coperte