Bollettino valanghe

West Slopes South

Northwest Avalanche Center
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Pericolo valanghe

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

In sintesi

Dynamic spring weather and limited information about the new snow lead to more questions than answers regarding avalanche cconcerns. Choose terrain that lets you easily identify and avoid steep open slopes and adjust to changing conditions.

Problemi valanghivi

  • Wind Slabs

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

    While you may trigger an avalanche in the new snow in very steep terrain, it's the wind loaded areas that are the real danger. You'll probably encounter two different versions of this same problem on Thursday. 

    Moderate to strong winds may form fresh slabs during the day. These wind loaded pockets will probably be easier to trigger, but should be relatively small. Blowing snow can help you figure out exactly where they are building. NW winds might develop slabs in some strange places. 

    Older slabs likely formed during the storm on Tuesday night. This version of the problem could be harder to spot and more difficult to trigger, but break much deeper. Look for sharp cornices and drifts to highlight areas of firmer, deeper snow. 

    You may find both types of wind slabs near ridges, along the base of cliffs, and on exposed mid-slope features. Give suspected wind loaded slopes a wide berth, especially in higher consequence terrain.

    (4/14/2026)

    Visual clues of wind transported snow and potentially wind loaded slopes. 

    Photo: Dallas Glass

  • Loose Wet

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

    It’s hard to say exactly how pervasive wet loose avalanches will be on Thursday. Some locations may have experienced loose slides and sunshine on Wednesday. The colder and drier the surface snow, the more of a shock the sun will be. If skies stay cloudy, this might not be much of a problem at all. 

    Watch for snow falling from trees and rocks. This is often our first clue that the sun is impacting the snow. Rollerballs and small wet loose slides often follow. If you start to notice the sun, get ahead of the problem by using routes that help you avoid being on or under steep sunny slopes. 

    The amount of new snow and the length of the slope have big impacts on the size of potential slides. Long, rocky faces with more than a foot of snow on them could easily produce large natural avalanches.

    (2/10/2026)

    Example: Rollerballs as snow sheds from rocks and trees earlier this winter. Slopes like this could produce natural wet loose slides. 

    Photo: Dallas Glass

Avalanche Discussion

This storm performed well in the West South zone. Storm totals vary widely from 6-12 inches near the crest to 15-18 inches on the volcanoes. We could pick up another few inches Wednesday night. Information about the new snow is limited, but the few reports we have suggest it’s largely right-side-up and bonding well to the underlying 4/14 crust. 

With a higher level of uncertainty, it's a good idea to take time to observe the new snow. Look all the way down to the first obvious crust. If it breaks in blocks or fails easily, dial it back. Things may be spicier than anticipated. How the snow reacts could also vary throughout the day, especially as it’s affected by the sun. Fortunately, we’re only worried about the storm snow. The 4/14 and 3/25 crusts have formed a very strong upper snowpack. Until these break down, we aren’t worried about any weaker snow below. 

The new snow certainly helps travel conditions! But don’t let the powder blind you. It may also hide rocks, bare ground, and even some holes. Coverage has been very thin at lower elevations and on southerly aspects. The fresh coat of snow didn’t change that. 

Regioni coperte