Bollettino valanghe

Mount Shasta

Mount Shasta Avalanche Center
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Pericolo valanghe

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

In sintesi

Very dangerous avalanche conditions exist near and above treeline. Backcountry travellers should stay out of avalanche terrain by avoiding being on or near slopes greater than 30°.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–2.5

    The eastern half of the compass will receive intense wind loading today as the storm takes hold. Any leeward aspect will be building wind slabs and you will be very likely to trigger an avalanche here. Areas that may have been hosting wind slabs before such as steep couloirs, unsupported slopes above or around cliffs, or convex break overs will be areas of most concern.

    These intense winds bear the potential to load below treeline terrain. Though, in the more protected areas of this elevation band, you may find the avalanche problem to carry the characteristics of a storm slab.

    Staying off and out from under avalanche terrain will keep you from being caught by an avalanche today. Instead, travel in low angle terrain and look for signs of instability: shooting cracks, collapsing and whoompfing snow. 

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

Avalanche Discussion

Expect conditions to change rapidly as the snowpack will not have time to adjust to the 15-30 inches of snow and 1-2 inches of snow water equivalent (SWE) that is forecast for the next 12 hours.

Before this storm, near and above treeline snow surfaces were an array of stubborn, old wind slabs, icy crusts and sastrugi. Terrain below treeline collected up to a foot of soft, dry snow on January 10th. During this time, we observed large of amounts of blowing snow from a fierce northwest wind, yet witnessed no avalanches.

Today, the wind shifts to be out of the west southwest, continuing to load those leeward easterly aspects that have been suspiciously inactive. As of this writing, the Old Ski Bowl weather station is recording 5 inches of new snow and just over half an inch of SWE since last night. 

Remain vigilant and don't dance with the avalanche dragon today.

Regioni coperte