Boletín de aludes

Mount Shasta

Mount Shasta Avalanche Center
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Peligro de aludes

Sun
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 2 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Large human-triggered avalanches are likely today. Your focus should be pinned on recently wind loaded slopes, on any aspect, near and above treeline. Careful slope assessment will be critical to safe backcountry travel. If in doubt, avoid steep slopes (greater than 30 degrees) where wind blown snow has accumulated.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2.5

    Over the last 48 hours, the dominant wind direction flip-flopped from southerly, to northwesterly, and back to southerly. Gray Butte recorded extended periods of sustained moderate speeds, with extreme gusts. Yesterday afternoon, massive amounts of wind transported snow could be seen blowing off of the major ridges on Mount Shasta. Expect to find wind slabs on any aspect near and above treeline, with focus on the leeward side of ridges, exposed open slopes, and underneath rock bands. These slabs could break multiple feet deep, potentially large enough to bury/kill. Wind slab development can happen real quick, only requiring a few hours of wind to become dangerous. With yesterday's northwest wind, wind loading could have occurred in some common backcountry ski lines such as Sun Bowl, Powder Bowl, Casaval Ridge, and Middle Peak of Castle Lake. A natural release is possible from some of these areas. Careful slope assessment will be crucial today. Look for shooting cracks, failing test slopes, deep snow, and active wind loading as signs of instability. Best bet is to avoid steep slopes (greater than 30 degrees) near and above treeline.

    (1/4/2025)

    Nearly two foot deep crown of an intentionally triggered wind slab avalanche in Sun Bowl

    Photo: Mount Shasta Avalanche Center

Avalanche Discussion

With shifting wind direction, and large amounts of soft snow available for transport, wind slab will be the primary concern today. Pockets of unstable snow could have accumulated on any aspect across the forecast area. Near and above treeline, large avalanches are possible.

Yesterday, forecasters went to the Parks Creek summit area to assess the new snow and lingering instability. Around 15–18 inches of new snow was encountered above 6,500 feet. Wind blew moderate out of the northwest, with sensitive cornice growth and light wind texture on open slopes. One small natural avalanche was identified. Wind blown snow could be seen swirling off of Mount Shasta. 

Access: The Everitt Memorial Highway is closed. Estimated opening is next week sometime.  Castle Lake road is also closed. Unknown opening.

OPEN - Pilgrim Creek and Deer Mountain Sno-Parks / Mt Shasta Ski Park and Nordic Center / FS31 road motorized/xc-ski access / McBride Springs ski access 

THIS WEEKEND:

Regiones cubiertas