Bollettino valanghe

West Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Fri
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

Limit travel on or directly under steep slopes seeing direct sun or where the snow is mushy and wet. Avoid this terrain if you see signs of instability like rollerballs and recent avalanches. Steer around steep terrain at upper elevations that holds dry, wind-drifted snow.

Problemi valanghivi

  • Loose Wet

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

    Thursday isn’t forecast to be full bluebird. But there could be enough sun - along with continued mild temperatures -  that more wet avalanches are possible. As usual, the extent of wet avalanche activity will hinge on cloud cover, temperature, and the snow surface in each area of the forecast zone. 

    With temperatures and wet new snow, observers reported plenty of wet avalanche activity on all aspects at mid-elevations on Wednesday. Look for additional avalanches in sun-exposed, upper-elevation slopes still holding cold snow that can react to sun and warming.

    (2/21/2024)

    A natural wet loose avalanche initiating from steep, rocky terrain on the south side of Mazama Dome at about 5500'.

    Photo: Zack McGill - Cascade Mountain Ascents

  • Wind Slabs

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

    Dry snow might actually exist in alpine terrain. Be ready to assess the stability of new and wind-drifted snow layers if you get that high. While you are more likely to trigger an avalanche on wind-drifted slopes, there is enough new snow that slab avalanches could also occur in wind-sheltered areas

    Track the depth and stiffness of new snow layers as you gain elevation. Visual clues can also help you identify areas with thicker slabs, but a bit of fresh snow falling overnight might make scoured slopes and pillowy-looking wind drifts harder to see.

    (2/24/2022)

    Stiff snow that cracks when weighted means you found an unstable wind slab.

    Photo: Adam Ü

Avalanche Discussion

Observers in the Baker BC reported another wet day, this time with multiple wet loose avalanches naturally occurring on all aspects (photos in gallery).“Dry is not a word I would use to describe any part of our ski day” might be the best summary of current conditions.

Precipitation amounts varied across West North, with the general pattern being the western reaches of the forecast zone receiving the most. Heather Meadows picked up about a half-inch of precipitation since Tuesday afternoon with about 6” of moist new snow at mid-elevations. Weather stations to the east showed about half that amount, while those to the west saw up to 1” in the same time period. Precipitation generally fell as rain or wet snow at low and mid-elevations. 

The thick rain curst buried in early February can be found anywhere from near the surface to 2-3' down, depending on elevation, aspect, and exposure to sun and wind. Weak, faceted snow was found above this crust and at other layer interfaces over the past few weeks, but has generally been observed as rounding and gaining strength in this forecast zone. It’s uncertain if these layers were related to human-triggered avalanches over the weekend in West North. 

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