Boletín de aludes

Presidential Range

Mount Washington Avalanche Center
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Peligro de aludes

Tue
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 4 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Later in the day, new snow and wind will create snow drifts that could avalanche under the weight of a person at middle and upper elevations. On east and south-facing slopes, watch out for blowing snow and areas where your boots sink into the new snow as a sign that you may be on or near sensitive wind drifts. 

Before new snow arrives, Use extra caution and mountaineering equipment in steep terrain, where falls can be deadly on a hard, slick snowpack with exposed rocks, ice, and trees below.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    When 2 - 4 inches of new snow arrives later in the afternoon, strong west and northwest winds have the opportunity to form new wind slabs on east-facing and south-facing slopes. Depending on the amount of new snow, wind slab depth could be between 1 - 2 feet in some areas and be reactive to the weight of a single person. 

    The size and severity of this avalanche problem today is dependent on the amount of new snow and how effectively the wind can transport it to lee aspects. This hazard will be easy to assess. Deep drifts forming, poor bonding to the old snow surface, poor visibility due to blowing snow, and shooting cracks when traveling in the terrain are red flags that this avalanche problem has become dangerous.

Avalanche Discussion

Throughout this morning and early afternoon, backcountry travelers are likely to find avalanche and snow conditions that are similar to the last few days. Firm, icy snow surfaces are widespread across the terrain where the greatest hazard is falling in steep terrain in unforgiving conditions. Mountaineering equipment, mindset, and experience are necessary to safely travel in these conditions. With the onset of any new snow, expect to add a wind slab avalanche problem to the list of hazards today. 

There is some uncertainty surrounding the amount of new snow, which will directly influence the size, distribution, and sensitivity of new wind slabs. The biggest thing to watch for is how much new snow is falling later in the day, which has the potential to fall at high rates of 1 - 2 inches-per-hour for short periods of time. This could allow for rapid slab formation on top of a slick snow surface that is reactive to a human trigger, and in some isolated areas, a natural avalanche is not impossible. 

If the lower end of forecasted snow totals are seen (1 - 2 inches), wind slabs still have the ability to form, but they will be smaller in depth and distribution. In this scenario, it is possible that the conditions for a MODERATE hazard rating may not be met. 

Make continuous snow assessments and observe weather changes throughout the day, while also thinking carefully about timing and plans if avalanche conditions change from the morning to the afternoon.

 

The Lion Head Summer Trail is CLOSED due to increased avalanche hazard. The Lion Head Winter Route is OPEN and the most direct route to the Mount Washington Summit from Pinkham Notch. 

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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