Bollettino valanghe

East Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Thu
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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In sintesi

Watch for small recent wind slabs at the highest elevations. Warming temperatures and sun could set off cornice fall or wet avalanches. You may find a weak and shallow snowpack in the eastern mountains.

Problemi valanghivi

  • Wind Slabs

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

    There are two main concerns around wind drifted snow:

    1) Large cornice falls triggered by warming temperatures and sun on leeward sides of ridges. Falling cornices could easily injure you if you're on or under them. They could also trigger avalanches. Stay out from under and well away from cornices. If you're traveling on a ridge, clues like exposed rocks and vegetation can tell you where you can stand without being on an overhung cornice.

    2) Small slabs may have formed at the highest elevations with west and southwest wind since Monday. While they'll be small, you could trigger these wind slabs on steep, leeward slopes. This adds to existing older wind slabs which are now difficult to trigger. Use small, inconsequential test slopes to check how easily wind-drifted snow cracks or slides. Steer around pockets of recently drifted snow. 

    An example a recently wind loaded slopes and cornices.

  • Loose Wet

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

    Another day of warm temperatures and sun could be enough to see wet avalanches on slopes that have yet to slide in the past couple of days. If slopes are getting soft and wet, move to lower-angle and more shaded terrain. These avalanches are generally easy to avoid and manage. Use caution in steep terrain or near terrain traps like cliffs and gullies where wet avalanches could be dangerous.

    (3/1/2021) Small point releases originating from rocks near the Bomber Chutes, just outside of the Mission Ridge ski area boundary at 6,200ft on an E aspect. These likely ran on Feb 27th or 28th. Photo: Josh Hirshberg

Avalanche Discussion

Quiet and warm weather has been the norm since last week. Observers continue to report large to very large avalanches that ran on February 22nd due to heavy snow and wind. 

Persistent slab avalanches are unlikely but could not completely impossible. You are most likely to encounter the persistent weak layers in the shallower eastern mountains. Check out this observation from Wolf Creek on Friday. Other forecast zones have been plagued with very large and destructive avalanches in the past 1-2 weeks. Be sure to check out the forecast for the East Central zone if you are traveling to the southern or eastern edge of this zone for more details on the crust/facet persistent weak layer that is problematic there. 

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