Bollettino valanghe

East Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

Expect large natural and human triggered avalanches as strong snow and wind create dangerous conditions. Wet snow avalanches become likely when rain falls at lower elevations. Travel in avalanche terrain is not recommended.

Problemi valanghivi

  • Loose Wet

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

    Snow will shift to rain in the late morning on Thursday below 3500 feet. This will rapidly destabilize new snow that previously fell. The typical progression of wet loose avalanches involves rollerballs and pinwheels that lead to point releases. If you start to get rained on, you won’t want to be hanging out on or below large paths. Don’t linger in terrain traps where avalanche debris can concentrate and be aware of steep terrain overhead where avalanches can start.

    (12/19/2024)

    Looking up at the debris from a small wet loose avalanche.

    Photo: Payton Schiff

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    2–2.5

    Significant wind speeds accompany the strong atmospheric river impacting the zone through Thursday. Gusts may exceed 100mph on the eastern side of the zone. You will find wind-loaded snow in atypical locations i.e. lower down on slopes and in exposed terrain at lower elevations. Wind slabs can appear as smooth or rounded pillows, but this may not be obvious as new snow quickly obscures wind-loaded areas. Expect to find wind-drifted snow just below ridgelines and in cross-loaded gullies. If you encounter cracking and collapsing in more sheltered areas, you have found storm slab instability. Travel in low angle terrain well away from steep slopes on Thursday.

    (12/8/2024)

    Visual clues such as actively blowing snow, fresh cornices, or pillow-like drifts can help identify wind-loaded slopes to avoid.

    Photo: Andy Harrington

Avalanche Discussion

Wednesday's weather forecast: "With this Christmas and Boxing Day day storm Santa delivers a serious punch. This storm is likely to go down as one of the most significant of the year in terms of snow accumulations and contends as a significant mountain wind event." In summation: new snow + strong wind = avalanches. It is imperative that you stay alert if you venture into the backcountry.

If you still need more convincing, here are a few more considerations. Avalanche danger is always the highest during or immediately after a storm. New wind slab formation can overload older wind slabs or lingering weak layers at upper elevations and produce a bigger and even more consequential avalanche. Rain on snow at lower elevations adds an extra layer of complexity to backcountry travel. The best way to manage the hazard is to practice patience and avoid avalanche terrain while you nurse your eggnog hangover.

Regioni coperte