Bollettino valanghe

East Slopes North

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

You may be able to trigger small avalanches where wind and snow form shallow drifts at upper elevation. Skies may clear enough to drive small loose avalanches on sunny slopes. While these avalanches could be possible in the west end of the zone, near Washington Pass, conditions may be less dangerous elsewhere. 

Problemi valanghivi

  • Wind Slabs

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

    Steer around fresh drifts on leeward sides of ridges at upper elevations. Any wind slabs should be limited to small pockets within the terrain. Expect these avalanches near Washington Pass if you find fresh drifts at least 6 inches deep or recent snowfall of at least 4 inches in wind-sheltered areas. Use caution on steep northerly aspects, especially above 6,000ft, where snow could slide easily on the interface of new and old snow. Further east and at lower elevations, you may find less elevated conditions. Continue to stay aware of overhead or nearby cornices.

    (3/8/2021) An example of blowing snow forming wind slabs in the Hairpin Valley near Washington Pass.

Avalanche Discussion

Near Washington Pass, unsettled weather will continue with up to another 5" of snow and moderate winds through Saturday. Make your own observations of how much new snow adds up and of any blowing snow. If enough snow falls before the sun comes out, you may encounter loose wet avalanches on sunny slopes.

This week, warming and sun formed crusts on the surface of most slopes to about 6,500ft. Steeper north aspects and those at upper elevations may have still held weak snow on the surface that will now make up the new-old interface.  Since the beginning of March, the region has undergone a slow warming trend. Observers have reported loose avalanches (both wet and dry) and falling cornices. Cornices are very large and still loom on many ridges.  Most of the observations of cornice fall came early in the month, but we continue to receive occasional reports. Continue to keep this hazard in mind. The mid-January weak layer that plagued most of the Cascades for the month of February was much less of a factor near Washington Pass.

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