Bollettino valanghe

Mount Shasta

Mount Shasta Avalanche Center
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Pericolo valanghe

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

In sintesi

Expect changing conditions and rising avalanche danger tonight into tomorrow. A strong winter storm is knocking on the door. Recently formed slabs of wind drifted snow linger in isolated terrain near and above treeline. Alpine terrain also hosts patches of very icy surfaces that will provide a slide for life for the unsuspecting. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1–1.5

    A strong northwest wind event did a number to near and above treeline terrain yesterday. Snow surfaces are well scoured. Any lingering wind slabs will be stubborn or unreactive to trigger. Your primary attention should be focused on areas partially protected from the wind. Steep couloirs, unsupported slopes above or around cliffs, or convex break overs might still host a small slab that could be triggered. Use standard clues like cornices and wind scoured surfaces to identify the loading patterns around you. Small, wind drifted features can give you a sense of slab reactivity. Expect a new round of slab formation tomorrow.

    Photo: Eric Falconer 1.11.23A small wind slab along a ridge in the Eddy Mountains, skier initiated crack

Avalanche Discussion

Avalanche risk is generally low out there today but anticipate rising danger with the incoming storm. Over the past 24 hours, temperatures have ranged from 17 to 27 F at 8,000 feet on the mountain. Wind has blown primarily out of the northwest, averaging 28 mi/hr with impressive gusts to 80 mi/hr! We have a wind ravaged snowpack near and above treeline with stubborn, old wind slabs, ice glaze and sastrugi features dotting the landscape. Despite a ton of blowing snow, we have not observed any avalanches. Below treeline, soft snow is plentiful. Mount Shasta received ~12 inches of snow on January 10th. Total snowpack height ranges from 50 to 60 inches near treeline. Over on the west side in the Castle Lake and Eddy mountains, 2 to 4 feet of snow is on the ground. A few shredders have been enjoying winter recreation above 6,000 feet. 

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