Boletín de aludes

East Slopes North

Northwest Avalanche Center
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Peligro de aludes

Thu
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 6 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Wind may create shallow, reactive slabs in upper elevation terrain. Use caution around leeward and cross-loaded features on steep slopes if you find recently drifted snow. The eastern edge of outlying ranges in the zone may harbor persistent weak layers, so travel with caution and make assessments before entering steep, committing slopes. 

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1

    Active wind drifting was observed on Tuesday, and winds should continue to transport snow into Wednesday morning. You are most likely to run into fresh, reactive drifts near ridgelines in upper elevation terrain. You could also find slabs mid-slope on open, crossloaded features. For the most part these avalanches will be shallow and isolated, but you could trigger a large avalanche in some heavily loaded areas. Look for textured snow surfaces, shooting cracks, and hollow sounding firm snow to clue you into wind slab hazards. As always, use terrain to your advantage and seek out less consequential slopes if you find signs of these. 

    Example thin wind slab.

Avalanche Discussion

Observers reported a small, recent looking wind slab in extreme terrain above treeline on Tuesday. On Monday, a skier triggered a small slab in the alpine near Washington Pass. A recent glide avalanche was also observed on Monday from a solar aspect near Kangaroo. 

In general, the snowpack is strong and well settled, though there may be layers of buried surface hoar or even basal facets in the outlying ranges further east of Washington Pass. An observer found buried weak layers in the Chelan-Sawtooth Mountains near Chelan on the 16th. In places like the eastern Chelan-Sawtooth and eastern Twisp River drainages, the snowpack may be shallow (less than 6ft deep) at upper elevations, and may harbor similar persistent weak layers. Look and listen for signs of instability as you travel such as shooting cracks and whumphs. If you find these signs, steer away from committing, steep slopes. 

From January 11th to 13th a major storm delivered heavy snow and even some rain at lower and mid-elevations. The Harts Pass Snotel picked up about 2.7" of water over the event.  Very large and destructive avalanches ran through entire avalanche paths. The avalanche cycle occurred on the night of the 12th. Observers reported avalanches to D3 in size (big enough to break mature timber and bury cars) including an avalanche that hit a closed portion of Highway 20, below Delancey Ridge. This avalanche ran over 3,000ft and formed debris piles that were 9 feet deep in places. 

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources. Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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