Bollettino valanghe

East Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Thu
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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In sintesi

Progressively warmer temperatures and strong sun will maintain a threat of wet avalanches on slopes steeper than 35 degrees. Time your travel to be off of and out from under sun-exposed slopes before the snow becomes wet and weak.  Use caution around cornices and wind features, especially near the Cascade Crest.

Problemi valanghivi

  • Loose Wet

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

    Wet avalanches will first be active on the east aspects and later on the west aspects. As you move through the mountains, take note of how much the surface snow has frozen or melted.  You may find dramatically different conditions at different aspects or elevations and as the day progresses. Plan ahead and be ready to move to slopes that are shaded or under 35 degrees. Move off of steep slopes before the snow is unsupportive and weak enough to entrain an avalanche.

    Wednesday will be the warmest day of the week so far. There's still enough dry snow available to produce avalanches especially at mid to upper elevations and on northeast and northwest aspects. East wind may again keep surfaces a bit cooler than normal, especially at mid to upper elevations. 

    (4/9/2021) Example small wet loose avalanches from near Stevens Pass.

Avalanche Discussion

West winds over the weekend formed shallow wind slabs on leeward sides of ridges. Ongoing east winds may form more recent slabs on the opposite sides of features. Pay attention to local wind loading patterns and steer around loaded slopes that are steeper than 35 degrees. Cornices loom over many ridges and may fall during the warm days this week. Glide cracks have again begun to open in steep rocky terrain. Use extra caution to avoid being on or under features with glide cracks and cornices. We expect significantly warmer temperatures starting on Thursday. Dangerous wet avalanche conditions may develop by the weekend.

An observer near Washington Pass reported that warm temperatures and sun since the weekend triggered small wet loose avalanches. Many slopes above 5,000ft still hold a mostly cold, winterlike snowpack. A storm with very strong winds left around 3-5" at Washington Pass on Saturday. The new snow adds to the 3-6" of new snow that fell over the 4/7 interface. In shadier terrain, you may find a variety of surfaces at that interface. The lower snowpack is generally strong and well settled.

Information and access to avalanche terrain have become limited in the zone. Make your own assessment of conditions. If you find conditions different than those mentioned here, defer to lower-angle slopes and more conservative terrain. Help us keep up with the changing spring conditions by submitting an observation here. 

Daily avalanche forecasts will end on Sunday, April 18th. 

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.

Regioni coperte