Boletín de aludes

Mount Shasta

Mount Shasta Avalanche Center
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Peligro de aludes

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

Lo esencial

Very dangerous avalanche conditions will develop today. A strong low pressure system will bring 30–40 inches of new snow to treeline by tomorrow morning. Natural and human triggered avalanches are very likely. Stay off of, and out from underneath, slopes greater than 30 degrees. 

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    1–3

    The combination of wind and new snow will produce widespread avalanche problems today. The first problem to develop will be wind slab. The strong-extreme winds have already begun to load westerly aspects with dry older snow. With 30–40 inches of snow expected through the next 24 hours, loading will mainly occur on SW-W-N-E aspects. Remember, wind can deposit snow 5 times faster than it can fall from the sky. These wind slabs could become 2–4 FEET deep by the end of the day. Expect the slabs to trigger easily, and break over 100 feet wide.

    Storm slab avalanches will also be prevalent. First thing in the morning, this problem will not exist, but as the day continues, this problem will become increasingly sensitive and widespread. Storm slabs can be found anywhere the new snow has fallen, and break up to 3 feet deep.

    These avalanche problems will be certainly large enough to bury and or kill you. As the storm commences, it is crucial to stay out of avalanche terrain.

    (1/20/2024)

    Soft Slab Avalanche

    Photo: Samuel Clairmont

Avalanche Discussion

Today marks the beginning of a strong low pressure system that will bring 3–4 feet of new snow to the forecast area. The National Weather Service has issued a Winter Storm Warning for Mount Shasta from 4am this morning, until 1pm Monday. As of right now, there isn't much of new snow on the ground, but it won't last long. By 9am, snowfall rates will quickly reach half an inch per hour. By mid-afternoon, rates will increase to 1–2 inches an hour, and maintain through the night. Instability will rapidly increase, making natural and human triggered avalanches likely on all aspects and elevations. In classic Shasta fashion, this new snow will be accompanied by gale force southerly winds. Expect visibility to be minimal or nonexistent at upper elevations.

This storm will likely bring the strongest snowfall intensity thus far this season. Most forecast models are in agreement of 30+ inches at treeline in the next 24 hours. For that to occur, snowfall rates will need to maintain 1 inch or more. This is very representative of what the avalanche danger will do. The faster the snow falls, the higher sensitivity and likelihood of natural and human triggered avalanches.

Today is not the day to be testing the snowpack. Show this storm the respect it deserves and stay out of avalanche terrain.

Thank you to everyone who came to our Know Before You Go last night! And thank you to Deadwood Co for hosting. This morning, 9am at Bunny Flat, we are providing our FREE transceiver clinic. If you're new to avalanche education, or just need a refresher, come and join us!

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