Bulletin d’avalanche

East Slopes North

Northwest Avalanche Center
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Danger d’avalanche

Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 5 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

You may still trigger small pockets of wind-affected snow on Friday particularly at upper elevations. Look for drifts and fresh cornices to help locate and avoid these wind-loaded features.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    You could still trigger recently formed wind slabs on exposed features Friday particularly near the base of cliffs, on convex rollovers, and in confined chutes. These potential avalanches will be more prevalent as you ascend into alpine terrain. Look for visual clues to help identify wind-loaded areas. When you see textures surfaces, drifts behind objects, or fresh cornices, anticipate wind slabs on nearby lee slopes. While these slabs should remain shallow and small, don't let them catch you by surprise in high consequence terrain. Seek out less wind-affected or lower angled slopes to travel through these areas. 

    In more sheltered terrain, the cold nature of this storm likely created a soft and unconsolidated surface. Don’t be surprised if you trigger shallow loose dry avalanches that run quickly over a recent crust.

    (3/20/2021) Example: Using visual clues is a great way to help identify the potential for Wind Slabs.

Avalanche Discussion

The recent storm brought 3-6” of snow for locations near the Cascade crest. This snow sits over the 4/7 interface. On sunny aspects, a frim crust marks that layer. In shadier terrain, you may find a variety of surfaces at the same depth. Cool temperatures and cloudy skies on Friday should limit any wet avalanche activity. However, given the dynamic and sometimes surprising nature of spring, if you find soft snow and see significant sunshine, anticipate loose wet slides on steep and often rocky slopes. This same period of quiet weather should help reduce but will not eliminate the potential for cornice and glide avalanches. These difficult to predict spring events can still fail even during these colder spells. Choose routes that help you limit the amount of time you need to spend below looming cornices and crevasse-like glide cracks. 

If you're out midweek let us and the backcountry community know what you see and Submit an Observation.

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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