Bulletin d’avalanche

East Slopes South

Northwest Avalanche Center
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Danger d’avalanche

Mon
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Périmé — ce bulletin a expiré last year. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Rain and warming temperatures will create very dangerous avalanche conditions across the East South mountains. Expect the most dangerous conditions to exist in areas closer to the Cascade Crest. Wherever you travel, just keep a simple plan and avoid all terrain where avalanches can start, run, or stop. 

Problèmes avalancheux

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1.5–2.5

    We have plenty of recent snow that is about to get wet. Increasing rain levels will weaken slabs as the day progresses. At the start of the day, dry snow problems like wind and storm slabs may exist at upper elevations, but these should be replaced by wet snow avalanche concerns as rain levels creep higher and higher into the alpine.   Expect these avalanches to be larger and more destructive in areas closer to the Cascade Crest that received more recent snow. 

    Whether these avalanches fail in dry or wet snow, expect them to be destructive and easily capable of killing you.  Dry snow slab avalanches might be a thing at the highest elevations, but wet snow will rule most areas. Expect to see some combination of wet slab, loose wet, and cornice fall avalanches by the end of the weekend. 

    Overlapping avalanche problems will make for a dynamic day. Keep it simple by avoiding travel on and below any avalanche terrain. 

    (12/18/2024)

    Wet avalanches can be incredibly destructive. Don't mess with these things. 

    Photo: Summit at Snoqualmie Pro Patrol

Avalanche Discussion

Sunday is shaping up to be a dangerous day. While precipitation amounts are not impressive by atmospheric river standards, the recent snow amounts and avalanche activity is certainly concerning as we head into a wet, warm pattern. We have a lot of dry snow that is about to get wet and weak on Sunday. 

This past week brought .5- 1.2 inches of snow water equivalent across the zone. The highest amounts fell near Bumping Lake, Chinook, and areas closer to White Pass and Mt Adams. While we didn’t hear of any avalanche activity in the east-south mountains, we did hear about numerous natural and human-triggered avalanches in neighboring zones. Most of these avalanches occurred in wind-loaded terrain, but some storm slabs released in more sheltered terrain closer to the Cascade crest. 

The amount of recent activity is notable as we head into a wet, warmer pattern. It may not take much rain or warming for us to see uniquely dangerous avalanche conditions. 

You can add to the forecast! Submit an observation here. 

 

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