Boletín de aludes

West Slopes North

Northwest Avalanche Center
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Peligro de aludes

Mon
Alta montaña
4 · Fuerte
Límite del bosque
4 · Fuerte
Bajo el límite
3 · Notable
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Desactualizado: este boletín caducó 6 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Heavy snow, wind, and rain will rapidly load the snowpack and produce large natural avalanches. Very dangerous conditions will continue through Monday. Travel in avalanche terrain is not recommended. 

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    2

    Expect heavy snowfall over the next 48hrs with increasing avalanche danger at all elevations. Warming temperatures and strong southwest winds will accompany the storm. Avalanche hazard will likely peak Sunday night. Uncertainty exists in regard to precipitation amounts during the day Sunday, and more snow could arrive earlier than expected. At least another 1-2ft of wet heavy snow will fall on a dry layered snowpack by the end of the weekend. Large natural avalanches within new snow are likely, especially in wind-loaded areas at upper elevations. Avalanches could run far distances and even break on deeper storm layers from earlier in the week. If you venture out during the storm, be certain of your ability to identify and avoid avalanche terrain and minimize exposure to any overhead hazard.

    (2/14/2021) An example of a recent large natural avalanche (D2) in motion on Mt. Herman (N, 5000ft). Similar avalanches are likely Sunday. Photo: Pete Durr

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2

    Snow levels look to rise to 3500ft+ by Sunday afternoon. If a significant warm-up doesn't occur by Sunday, it will by Monday. This warm and wet event will follow a prolonged period of relatively cold temperatures and low elevation snow. This rapid change will cause the snowpack to quickly lose strength. Wet avalanches are likely anywhere you encounter wet heavy surface snow, rollerballs, pinwheels, or snow dripping from trees. Loose wet avalanches could build significant mass as they run downslope and create nasty debris piles. Avoid avalanche terrain if you encounter rain on snow.

    (1/14/2021) Example photo of a wet snow avalanche in the West Central zone from a similar weather event earlier this season.

Avalanche Discussion

A snowboarder triggered and was caught, carried, and partially buried in an avalanche Saturday near Huntoon Point. They sustained non-critical injuries and were able to self-rescue with their partners. The avalanche was estimated to be 60ft wide and 18in deep breaking within the recent storm snow.

The Mt. Baker area received over 3ft of new snow in the past week with incremental loads of cold, low-density snow almost every day. Rounds of warmer and heavier precipitation will begin Saturday night and look to continue through Tuesday as an atmospheric river takes aim at the region. This will be a significant loading event, and a widespread natural avalanche cycle is expected. Incoming storm snow will form thick and reactive slabs atop lighter snow from the past week. Natural avalanches are likely even below treeline, especially with rising snow levels and the potential for heavy rain. The most dangerous conditions will exist in wind-loaded alpine terrain, where large natural avalanches could run far distances. Tree well and deep snow immersion hazards are a serious problem with all the 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.

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