Bollettino valanghe

East Slopes South

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

Winds have blown from multiple directions over the past few days, so don't be surprised if you find wind-drifted snow in unusual areas. Any triggered avalanche in wind-drifted snow has the potential to grow much larger and could be unsurvivable. So, seek out more sheltered slopes that are less than 30 degrees. 

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3

    You can trigger avalanches that fail on weak layers that exist 2-4 ft below the snow surface. It's been several days since the last known persistent slab avalanche in the eastern mountains, but observers as of Sunday reported multiple whumping collapses in the Blewett Pass area. Unfortunately, this structure is widespread throughout the zone and in many parts of the region. Additionally, a  layer of buried surface hoar from January 2nd sits an inch or two above a crust from December 30th and has been the culprit of several avalanches near Darland Mtn and the east central. Persistent slabs take persistent patience. So, your best mitigation tool will be to stay off open steep slopes to reduce the odds of you triggering one. 

    (1/10/2024)

    Backcountry travelers near Lake Wenatchee remotely triggered this avalanche from a low angle adjacent slope. This avalanche ran on weak, facted snow over the Solstice Crust.

    Photo: Pat Riffie

  • Wind Slabs

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

    Winds have blown from multiple directions (including from the east) in the past days, so don't let your guard down as you change aspects. As you travel, use visual clues to help you identify where the problem exists. Look for textured surfaces, pillow-like slabs, or sharp drifts to help you spot where wind slabs could lurk. As always, pump the brakes and default to less exposed terrain if you notice shooting cracks or hollow-sounding snow under your feet or sled. 

    Any triggered wind slab could step down to more deeply buried weak layers, become very large, and propagate across terrain features. So increase your margins from these pockets if you find yourself in wind-exposed terrain. 

    (12/1/2023)

    Shooting cracks are obvious signs of instability that should not be ignored. 

    Photo: Joe Dellaporta

Avalanche Discussion

Backcountry travelers in neighboring zones continue to report large avalanches failing on weak layers 2-4 ft below the snow surface and other notable signs of instability, such as whumping collapses. It's been a quiet few days avalanche-wise in the eastern mountains, but that may change soon as a weather system rolls into the region on Wednesday. To make the situation more complicated, observers across the region have also reported pockets of surface hoar and near-surface facet growth from the recent cold, dry spell. So if you're out Tuesday, be sure to track surfaces and be ready to dial it back as snow starts tricking in. 

If you get out, let us know what you see by submitting a public observation. 

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