Bollettino valanghe

Presidential Range

Mount Washington Avalanche Center
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Pericolo valanghe

Wed
Alta quota
1 · Debole
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto last year. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

You could trigger a small avalanche in steep terrain as warming temperatures and mixed precipitation begin to change the snow surface. Use your hand, a ski pole, or a shovel to understand the thickness and sensitivity of deeper, softer snow.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    What and where is it:Watch out for small wind slabs up to 12 inches thick on steep east-facing slopes above 3000 feet. Pay careful attention to the upper sections of steep terrain, which could harbor a wind slab that is not connected to the terrain below. Wind slabs could be triggered by your weight and be sensitive to warming temperatures or mixed precipitation today. How can you recognize it: Watch for areas of stiff, wind-affected snow drifts sitting on top of the hard old snow surface. Dense snow drifts deeper than your boot, shooting cracks from under your feet, and new soft snow easily sliding on the old snow surface are signs of a wind slab. Use your hand, a ski pole, or a shovel to assess slab depth and the ability of the new snow to stick to the hard old snow.

    How can you manage it:Make snowpack observations consistently throughout the day and carefully evaluate each slope you decide to travel on. Pay attention to the actions of other people, especially if they are above you where new wind slabs could be larger and more sensitive.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–1.5

    What and where is it:Soft, unconsolidated snow that is affected by warm temperatures or mixed precipitation could create small avalanches in steep terrain. The most likely place to find significant wet loose avalanche activity is on steep, east-facing aspects. Wet loose avalanches are likely to be released from a single point but gain speed and entrain snow on the way down. While small, these avalanches can be powerful enough to cause a fall in steep terrain or push you into terrain traps or obstacles below. 

    How can you recognize it: Pay attention to warming temperatures today, especially below 5000 feet. Rain or mixed precipitation could make this problem more active as unconsolidated soft snow rapidly changes. Look for small point-release avalanches in very steep terrain, near rocks, cliffs, and steep sections of ice.

    How can you manage it:Choose terrain with runouts that are free from obstacles like rocks, cliffs, or trees if small loose wet avalanches may cause a fall in steep terrain.

Avalanche Discussion

Expect conditions to be dynamic today as temperatures increase at all elevations and the snow surface begins to rapidly change. 

New wind slabs are likely to be variable in sensitivity based on slab thickness, warming temperatures, and time of day. If temperatures warm rapidly, be prepared for wind slabs to be more sensitive to your weight, especially if they are thicker and more connected across larger areas of the terrain. 

Below the new snow is a widespread hard old snow surface that has the potential to act as an effective sliding surface for both the new snow and people. Triggering even a small avalanche in steep terrain today could result in an uncontrolled, dangerous long-sliding-fall. Travel strategically in avalanche terrain to mitigate the risk and consequences of triggering an avalanche. 

Below 3000 feet, new snow totals are much lower with much less wind affect. However, this is where temperatures will be the warmest. Move carefully in steep terrain and use caution around snow that is wet and slides easily on the hard, old snow.

OBSERVATIONS: Please consider submitting an observation on our website or in the new Avy phone app 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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