Bollettino valanghe

Eastside Region

Eastern Sierra Avalanche Center
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Pericolo valanghe

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

In sintesi

Wind slabs and cornices perched in alpine terrain may be sensitive to human triggers today. On sun-exposed slopes, wet snow instability may develop this morning before clouds move in later this afternoon. Carefully evaluate the snowpack if traveling near ridgelines and avoid spending time on or below large slopes where the sun is melting the snow surface.

Problemi valanghivi

  • Wind Slabs

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

    Southwest winds picked up yesterday afternoon leading to another round of wind transport that built fresh slabs on the leeward side of ridgelines. These new slabs will mostly be small in size, but in isolated start zones prone to wind loading by westerly flow large human-triggered slab avalanches may be possible.  Wind loading was mostly seen above the treeline, but in isolated areas near the treeline small slabs may exist. Winds decreased overnight and no new loading is expected today. Be alert for signs of instability such as shooting cracks and audible slope collapses. Large drifts, recent cornice growth, hollow upside-down feeling snow, and uneven snow surfaces are all clues that indicate nearby wind slabs. Do your own localized assessments and carefully evaluate terrain features that encourage drifting, such as the leeward sides of ridgelines, alpine couloirs, gully features, and cross-loaded depressions. Keep in mind that even a small wind slab avalanche could have higher consequences in extreme terrain.

    (4/6/2024)

    Skier triggered Wind slab on Mono Jim peak, Convict area

    Photo: Steve Mace

  • Loose Wet

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

    Wet loose avalanches will become possible this morning on steep solar slopes as temperatures rise. Thawing surface crusts, sinking into wet snow past your boot top, or roller balls coming down from cliff bands are warning signs that loose wet avalanches are becoming a problem. Very steep, rocky slopes and areas with thin snow cover will warm first as the sun hits them. Conditions will vary with aspect and elevation across the forecast area. You may experience stable conditions beneath your feet while the terrain above or below you is already too warm. Localized assessments of surface thawing and deep wet snow will be key. Consider the slopes above you and plan your exit to avoid overhead hazards as the day warms.

Avalanche Discussion

Recent avalanches: No large avalanches were reported yesterday. A small skier-triggered (intentional ski cut) avalanche was reported yesterday above the treeline on a north aspect in Convict Creek. As the skies cleared following the storm from two days ago debris piles from large natural wind slab avalanches were visible below major north through east facing avalanche paths above treeline.

The likelihood of loose wet avalanches today will depend on the timing of this afternoon's forecasted weather. If clouds move in earlier than expected surface snow may not have time to melt enough for natural avalanche activity. If clouds don't arrive until late afternoon or evening then we may see widespread loose wet activity on sun-exposed slopes. Over the past week, overhanging cornices have developed above steep bowls and chutes. Give cornices a wide berth, especially where they hang above terrain where a fall would have greater consequences.

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