Bollettino valanghe

West Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

Fri
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Another round of sunshine and unseasonably warm temperatures will maintain concern for wet avalanches Thursday. Pay close attention as conditions change throughout the day, and avoid slopes steeper than 35 degrees where you encounter wet and weak snow surfaces. At upper elevations, carefully evaluate areas of wind drifted snow formed earlier in the week. 

Problemi valanghivi

  • Loose Wet

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

    You may encounter wet and weak snow surfaces on any aspect, but wet avalanches will be most likely on steep, rocky slopes in direct sunlight. Watch for dripping trees, pinwheels, and rollerballs as clues that loose wet avalanches may follow. Wet avalanches on Thursday could entrain significant snow as they run downslope and some may even grow large. Pay attention to changing conditions throughout the day, and move to shaded or lower angle terrain to avoid the problem. Watch for any opening glide cracks as well, and steer clear of areas near and below these unpredictable features.   

    (12/2/2020) Rollerballs and pinwheels on the east aspect of Table Mountain near 5500ft.

  • Wind Slabs

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

    You may still be able to trigger an avalanche in wind drifted snow on slopes steeper than 35 degrees at upper elevations. Recent snow from Monday's storm was redistributed by strong southerly winds, and evidence of previous wind loading is easy to find high in the alpine. Although lingering wind slabs are gaining strength, pay attention as you climb up in elevation and transition into wind affected terrain. Watch for blowing snow, lens-shaped pillows, and sudden changes in snow surface texture and hardness. Steer around steep slopes and convex rollovers where you see old large drifts or feel firm hollow snow. Also, keep in mind that cornices may weaken during this dramatic warm-up and could sag or even drop onto slopes below acting as large triggers.

    (12/2/2020) Looking towards Ptarmagin Ridge and the NE side of Mt. Baker from Artist Point. Plenty of evidence of wind drifted snow in the Alpine.

Avalanche Discussion

Freezing levels skyrocketed Tuesday night (10000-11000ft) followed by sunny spring-like weather Wednesday. Small wet loose avalanches were reported in neighboring zones, along with a few opening glide cracks. Despite the warm sunny weather, snow surfaces on shaded northerly slopes were still cold and dry with good riding conditions in the morning. Evidence of wind loading was easy to see high in the alpine. A handful of avalanches occurred in wind-loaded upper elevation slopes during Monday's storm, but lingering wind slabs are gaining strength and becoming harder to trigger.  

Overall, we have a substantial early season base of 40-65 inches. Avalanches have been limited to the upper layers, making for a good start to the year’s snowpack.  Snow lines in the West Central zone are averaging 2500 - 3000ft.  Remember that it is still early season and there are plenty of obstacles such as hidden logs, rocks, streams, and variable snow conditions at lower elevations.

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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