Bollettino valanghe

Presidential Range

Mount Washington Avalanche Center
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Pericolo valanghe

Sun
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

You could trigger a large avalanche on steep south-facing and east-facing slopes above 3000 feet in elevation. Careful snowpack evaluation to identify areas of unstable wind-drifted snow will be necessary for traveling safely in avalanche terrain. Watch out for long cracks in the snow under your feet as a sign that avalanche conditions could be dangerous.

Problemi valanghivi

  • Wind Slabs

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

    After 10.5 inches of new snow in the past 3 days combined with sustained winds, expect to find stiff wind slabs that could be multiple feet thick and may have a poor, strong-over-weak structure. The most likely places to encounter a dangerous wind slab avalanche today are on steep, east-facing and southeast-facing slopes between 3500 and 5000 feet in elevation and around terrain features that provide shelter from the wind. Examples of these areas of concern include The Lip, Sluice, and the Summer Lion Head Trail.

    Digging down to the old crust (buried over 3 feet deep in some places) will help give an accurate assessment of the size and sensitivity of these new wind slabs. Stiff and stubborn wind slabs could give a false sense of stability today. Remember that ski or boot tracks on a slope are not guaranteed indicators of snowpack stability.

Avalanche Discussion

New snow yesterday combined with many hours of wind speeds above 70 mph (and a period of wind over 90mph), have led us past the peak of instability for new wind slabs. Even though the chance for natural avalanches is reduced today, it is important to remember that you may be able to find unstable slabs that are several feet in thickness. This poses a risk profile with higher potential consequences if you are choosing to travel in eastern or southern avalanche terrain today. 

Do not take today’s MODERATE hazard rating lightly, due to the potential size of new wind slabs and the possibility that they may still be sensitive to the weight of a single person. It’s worth creating route plans today that identify specific areas of concern, utilize terrain features for protection, and account for the time it will take to make thorough assessments of the snowpack. As winds increase again through the day, it's worth keeping an eye out for additional blowing snow which could be creating additional new wind slabs. 

OBSERVATIONS: Please consider submitting an observation of what you are seeing in your travels. Submitting an observation hones your skills, informs other users, and improves our forecasts.

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