Bollettino valanghe

West Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

Wed
Alta quota
4 · Forte
Limite del bosco
3 · Marcato
Sotto il limite
Senza grado
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Non aggiornato — questo bollettino è scaduto 8 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

As we continue our struggle with the natural disaster resulting in flooding and landslides, snowlines are lowering and avalanche danger is increasing. Snowfall throughout the day with increasing temperatures will result in dangerous avalanche conditions. Stick to lower-angle terrain and avoid travel beneath large overhead paths. 

Problemi valanghivi

  • Storm Slabs

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

    Expect large, dangerous natural and human-triggered avalanches on Tuesday. At upper elevations, a slick crust may exist beneath one to two feet of snow, making fresh slabs more prone to sliding. It’s a good day to stick to sheltered, lower-angle slopes and avoid traveling beneath steep terrain. 

    Wind-drifted areas will be particularly reactive, plus rising temperatures will create an “upside-down” snowpack. This means areas not affected by wind could avalanche as heavier snow sits on top of a lighter layer. Sensitivity will increase throughout the day.

    Example photo: Natural and human-triggered avalanches will result on steep slopes on Tuesday. This is a good day to stick to lower angle terrain, away from large paths. Danger will increase as the day progresses. 

  • Loose Wet

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

    Wet loose avalanches may begin early in the day where you find sufficient snow cover near the bottom of the mid elevation band. As temperatures increase, wet avalanche activity will reach higher, resulting in larger avalanches where more new snow exists. 

    Most wet avalanche activity will be limited to new snow that was previously dry. These avalanches could slide more easily on an underlying crust. If you notice snow getting moist and clumpy, or see any rollerballs or loose slides initiating, steer around these steep paths and lower angle terrain beneath them. 

    There's a tiny chance that lingering glide avalanches could still happen on steep, snow-covered cliffs where poorly-attached snow still remains. Avoid travel beneath areas where you notice these overhead hazards. 

    Example photo: Wet loose avalanches will occur as temperatures increase and rain reaches higher on Tuesday.

Avalanche Discussion

Between two and three and a half inches of rain fell Sunday night and Monday in the zone. A few inches of snow may have fallen at the top of the upper elevation band. Lighter precipitation with a freezing level around 4500 feet is expected Monday night. On Tuesday, over an inch of water is forecast, with freezing levels rising to 5,500 feet in the afternoon. By day's end, mid-elevations could see up to a foot of snow, with one to two feet or more higher up. Winter is finally arriving in full force, so if you're heading out, be cautious of new snow hiding thinly buried hazards.

Several key access points are closed due to washouts and landslides. Recent storms have had a significant impact, both in the mountains and lowlands, making it difficult to reach many areas. Outside of weather station data, observations are limited, so be prepared to assess avalanche conditions yourself when entering snow-covered terrain. Snow totals and temperatures vary widely across the forecast zone.

With the warm start to the 25-26 winter season, we have less snowpack information than usual to start daily forecast operations. For zones and elevation bands with less snow than needed for avalanche hazard, we will issue a forecast with No Rating. Anticipated avalanche and weather conditions will still be updated daily. NWAC will issue an avalanche danger rating for a zone when enough snow to produce avalanches has accumulated at middle and upper elevations.

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