Bollettino valanghe

Mount Shasta

Mount Shasta Avalanche Center
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Pericolo valanghe

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

In sintesi

Avalanche danger remains elevated due to a poor snowpack structure and recently formed wind drifts. Surface instabilities are likely to occur in areas steeper than 35 degrees. Terrain that sits below leeward ridgelines and cornices should be given a wide safety buffer. Evaluate the snowpack before committing to a slope. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Northerly aspects near and above treeline that are shady, steep, and convex are the most likely places to encounter lingering instabilities. Approach with caution and abide to Mother Nature's warning signs like, shooting cracks, collapsing, and recent avalanches.    A predominant south and southeast wind has been blowing at strong to moderate speeds over the past 48 hours. Wind slabs have developed on all west, north, and east-facing aspects at all elevations, being most pronounced near and above treeline. South and southwest aspects have experienced cross-loading. High-intensity snowfall accompanied these winds, providing ample ammunition for wind slabs to grow multiple feet in depth. Drifted locations will be on the leeward sides of ridgelines, beneath rock outcroppings, and in mid-slope depressions. Wind lips and cornices will point to the most dangerous slopes. Textured or stiffened surfaces indicate the presence of a wind slab. Trigger points will be near convex slope features and in areas where drifted snow has nestled among steep rock outcroppings.    Over 2.5 feet of storm snow has fallen across the forecast region since February 4th. In that time, temperatures have trended from cool to warm, inverting the upper portion of the snowpack. A surface slab a foot and a half deep now sits above softer snow that fell on February 1st. Surface slabs consist of nearly three inches of water weight and a 4-finger density, giving it a supportable feel, while not giving any signs or clues of instabilities. This can be tricky and deceiving in high stakes terrain. Yesterday, no signs of recent avalanches or surface instabilities were observed. However, stability tests resulted in propagation multiple times on a storm interface 42cm (17") down from the surface. These results reflect that even though these layers may be difficult to penetrate, there is still a risk of finding the right weak spot with the right trigger. The best line of defense is to give the snowpack time to adjust to the new load before stepping out into steep terrain. 

Avalanche Discussion

Time will tell in the grand scheme of things, which is why's it's prudent to use a little time now to reacquaint yourself with the snowpack. During the last two days observations have all occurred near and below treeline, leaving a moderate amount of uncertainty for above treeline elevations. Please, if you see or experience anything, feel free to post an observation on our website. “Team work makes the dream work!”

The Everit Memorial Highway and Castle Lake roads are currently closed due to snow removal. Without these vigorous workers, no one would be able to enjoy the places we love to explore. They are doing their best to keep the roads safe. We will inform ASAP on our social media platforms when the road is forecasted to open. 

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