Bollettino valanghe

East Slopes South

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

Look for a transition to snowier, more winter-like weather on Sunday. Fresh snowfall will bring an increased chance of triggering an avalanche in layers of new snow. Start the day with a conservative mindset and choose lower-angle terrain to minimize risk. 

Problemi valanghivi

  • Storm Slabs

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

    Look for 6-12 inches of new snow on Sunday depending on your location within the forecast zone. There should be more new snow the closer you get to the Cascade Crest. The best time to trigger an avalanche in new snow layers is during or immediately after heavy snowfall. You are more likely to trigger a fresh slab on slopes where the wind built thicker slabs, but it would be wise to assess stability on all aspects instead of just focusing on wind-loaded terrain.

    Tracking new snow depths should be easy by observing the difference between the old (harder) and new (softer) snow.  Just dig down with your hand as you gain elevation and change aspects. Look for instability by riding across very small test slopes - did you trigger a small avalanche? If so you will probably get a bigger one on a larger slope. Shooting cracks or loud whumps are a sign you could trigger an avalanche if you head onto a steep slope. When in doubt just stick to simpler, sheltered, lower-angle areas.

    Don't ignore shooting cracks or other signs of instability in the new snow.

    Photo: Ron Martin

Avalanche Discussion

The East South forecast zone came in on the low end of precipitation with the latest storm. Most weather stations reported little or no new snow or rain until Saturday evening. Other parts of the Cascades saw an inch or many inches of precipitation with much of it falling as rain. The lack of rain could be good or bad depending on a few things. No rain means that areas with minimal snow cover will keep most of the snow on the ground. It also means there will not be much of a crust, at least on slopes that didn't see much sun last week. 

The downside is weak, faceted snow and surface hoar currently at the snow surface might stick around, get buried by new snow, and become a problematic weak layer.  Keeping this in mind, don't ignore obvious signs of instability like shooting cracks, whumphing, or recent avalanches. Take a conservative approach until you get a feel for conditions wherever you are in the mountains.

Regioni coperte