Bollettino valanghe

West Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Sat
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Snowfall picked up again and human triggered avalanches are likely on steep slopes.  Pay extra attention to areas where wind drifted snow into deeper and more reactive slabs.  Avoid all slopes steeper than 35 degrees, and do not linger in areas beneath large avalanche runouts either.  

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    Large natural and human triggered avalanches up to D2 occurred in the last several days. Currently, your greatest avalanche concern lies in areas with thicker and more reactive slabs that developed with wind loading. Keep an eye out for wind-affected snow which appears pillow-like or textured, and feels hollow or stiffer. Wind is forecasted to stay active into Friday morning, which you will especially notice along ridgelines. The wind affected snow will avalanche easier than non-wind affected snow. 

    There are reports of avalanches failing on numerous interfaces in the new snow layers, some of which are now buried over two feet deep. The short period of settled weather helped to strengthen these layers, but avalanches still may occur on them. On Wednesday south facing slopes became moist,  wet loose avalanches occurred and a crust formed, which the new snow may have trouble sticking to. You could see storm slab or dry loose avalanches running on this new interface. We are forecasted to receive around 6 inches of snow overnight with more forecasted throughout the day.  With all of these concerns, avoid slopes steeper than 35 degrees, especially ones with signs of wind loading, and consider traveling around the runouts of large steep slopes as well.

    (2/17/2021) Bearpaw area, D2 slab avalanche, NE aspect at 5500ft. Photo: Patrick Kennedy

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    2–3

    Although unlikely, if you find a sweet spot, you may trigger an avalanche on the mid-January persistent weak layer, now buried 5-7+ ft deep. Over two weeks have passed since the last known avalanche ran on this weak layer. With the recent new load and a lack of observations, continue being cautious of this layer while so much uncertainty is present. Stay well away from big, steep, and open slopes near and above treeline. Travel carefully through runouts beneath large slopes while this danger lingers.

    (2/3/2021) A person touring along the ridgeline from Artist Point to Huntoon Point remotely triggered a cornice that fell onto the slope below triggering this large avalanche. The avalanche occurred on a NE aspect at 5000ft and failed about 1 meter deep on the 1/24 interface.

Avalanche Discussion

On Wednesday two separate observers reported touchy slabs at higher elevations, and both parties triggered avalanches. These slabs were wind affected. Both groups also saw numerous natural avalanches which occurred on previous days.  You can check out the reports HERE and HERE. 

Tree well and deep snow immersion hazards are a serious problem with all our recent snow. Find out more information about deep snow safety HERE. 

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