Lawinenlagebericht

Eastside Region

Eastern Sierra Avalanche Center
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Lawinengefahr

Wed
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 2 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Wind slabs ranging in size and sensitivity may be possible to find in leeward catchment zones adjacent to ridgelines, alpine couloirs, and in cross-loaded depressions near and above treeline today. Localized assessments will be important to help you identify and avoid features of concern.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    Recent field observations have highlighted widespread impacts from our extreme winds over the past few days. A quick-moving storm brought minimal snow accumulations to the northern half of the forecast area in the afternoon, and winds shifted to the north and decreased substantially in speed overnight. Wind deposits will range in size and sensitivity today. Slabs formed during last weekend’s storm have gained strength and will be more difficult to trigger. More recent deposits resulting from yesterday’s new snow will be smaller in size but more sensitive to human triggers. Watch for clues like textured snow surfaces, fresh drifts, and hollow, upside-down feeling snow. Be suspect of terrain features that encourage drifting, such as the leeward sides of ridgelines, alpine couloirs, mid-slope convex rollovers, and cross-loaded depressions.

    (12/16/2024)

    Mammoth Mountain with Kelvin-Helmholtz formations developing above — a sign of high wind activity.

    Photo: Brooke Maushund

Avalanche Discussion

Overall, avalanche concerns have decreased since the loading event over the weekend. Over the past few days, extreme winds have heavily impacted exposed terrain at higher elevations, compressing surface snow and leaving less loose snow available for transport than expected. Fresh deposits from yesterday’s strong winds and new snow should be at the top of your mind as you head into the backcountry today. Be particularly cautious in areas like steep alpine couloirs and confined terrain features where the consequences of an avalanche are increased. Beyond the concern for small instabilities today, field observations have highlighted challenging and variable surface conditions. Surface crusts of varying thickness should be expected as you head out today. This stabilizing trend is likely to continue through the remainder of the work week as we enter a period of high pressure.

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