Bollettino valanghe

West Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

Sat
Alta quota
1 · Debole
Limite del bosco
1 · Debole
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

While an avalanche may be hard to find, you might come across one on steep slope with recent wind loading. Look for cornices, scoured ridgelines, and stiffer, wind-drifted snow. Sparse, early-season snow cover can still be found at all elevations. 

Problemi valanghivi

  • Wind Slabs

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

    There have been no observations of reactive wind slab around West Central or Stevens Pass, but there is enough snow and just enough wind you might find one if you look hard enough. Getting caught in a small wind slab could still result in getting pushed into a terrain trap or dragged across rocks, stumps, etc. 

    You are most likely to find this problem along upper-elevation ridgelines, in complex terrain like gullies and couloirs, below cliff bands, or on steep, unsupported slopes. Look for and assess wind-drifted snow as you gain elevation or change aspects.  If you observe more wind than forecast, be prepared to find fresh, reactive slabs that will take a more conservative strategy to navigate safely

    A scoured or rippled snow surface is a clue you could find wind slab nearby.

Avalanche Discussion

West Central should see more sun but slightly cooler temperatures for Friday. Avoid being on or directly under steep slopes if you observe signs of instability like rollerballs and very small avalanches. You are most likely to see these below cliffs and steep treed terrain that shed snow with warming. 

On Thursday, an observer at Stevens Pass reported 3’ of snow over the ground at 5300’. Wind effect was minimal in this area and no reactive wind slab was observed. The sun had limited effect on the snow surface at midday and good riding conditions were found on south aspects. This may have changed by the end of the day, with continued sun exposure and slightly warmer temperatures. 

Observations from near Hwy 2 in West Central indicated a right-side-up snowpack with minimal instabilities on Monday (observation). There was evidence of previous wind transport along ridgelines.  Small rollerballs were observed on steep slopes in the freshly dampened, low-density surface snow. Lower elevations still harbored obstacles such as exposed or subtly buried stumps, rocks, and creeks.

Regioni coperte