Bollettino valanghe

East Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Tue
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
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

Light snowfall and easterly winds are maintaining avalanche danger at upper elevations. Use caution on steep slopes exposed to the wind if you observe shooting cracks, thick and hollow slabs, or active wind transport. Steep slopes in direct sun may warm up enough to create small loose avalanches later in the day.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    Recent snow and shifting strong winds, will drift slabs on a variety of aspects. Slabs may be thickest and larger at upper elevations. Older wind slabs formed from west winds through Saturday. We expect east to northeast winds on Monday.

    Look for active wind transport and areas of drifted snow as you climb in elevation. You may be able to easily identify slabs with surface texture. If you observe shooting cracks in drifted snow, then be sure to avoid steeper or consequential slopes. Consider areas that get enhanced wind loading such as steep slopes near low points on ridgelines, and cross drifted raised features mid-slope. Cornices may be fragile from recent growth, and could break under the weight of a person. 

    Small wind slab example.

    Photo: Will Govus

Avalanche Discussion

Washington Pass picked about 6-7" since Friday, with another 1-2" expected on Monday. On slopes that receive direct sun, the new snow may warm up enough for small wet avalanches. Beneath the new snow, you'll likely find a recently formed, and frozen crust. This crust may be on the surface in windward areas or further east in the zone.

Information and observations are limited. Access to snow-covered slopes has become difficult in parts of the zone. Be prepared to make your own observations and assessments. If you see conditions different than what we describe, defer to lower-angle and simpler terrain. The North Cascades Highway SR 20 is currently gated at Silverstar, though the road is plowed further west. With road clearing operations underway midweek and other professional operations inactive, your observations are needed. If you're out in the mountains, let us know what you see. 

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