Bulletin d’avalanche

Presidential Range

Mount Washington Avalanche Center
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Danger d’avalanche

Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 6 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

You could trigger an avalanche in wind-drifted snow on steep west-facing and south-facing slopes. Watch out for snow drifts that are stiff on the surface, but soft underneath and pay attention to how the snowpack changes as you travel through the terrain. Dynamic and changing conditions today mean your own observations are critical to support safe decision making.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    What and where is it: Expect to find new wind slabs from increasing, shifting winds and incoming snowfall throughout the day. You are most likely to encounter a new, sensitive wind slab on west-facing and south-facing aspects below 5000 feet in elevation, but don’t rule out the possibility of finding a dangerous wind slab at all elevations today.  Late tonight, as winds shift northwest, expect winds to move snow back into eastern ravines. 

    How can you recognize it: Look for obvious signs of an unstable snowpack, including snow blowing at the ridgelines, rapidly-forming deep drifts, and shooting cracks under your feet. Digging in the snow with your hand, a pole, or a shovel could reveal a hard-over-soft snow structure that may slide easily on a firm layer of snow below. How can you manage it:Consider the timing of your travel in avalanche terrain. Avalanche hazard is not expected to be elevated early this morning, but with continued wind and incoming new snow, the chance of finding larger wind slabs will increase as the day progresses. Travel on firm surfaces to mitigate your chance of being caught and stay clear of terrain traps like deep gullies and depressions where even a small avalanche could have devastating consequences.

Avalanche Discussion

An incoming nor-easter storm will pass to the east today. While it is not expected to be a direct hit to the forecast area, expect this storm to create dynamic, changing conditions throughout the day. Extreme east and north winds combined with 3 - 6 inches of new snow will have the ability to build an avalanche problem on west and south facing slopes - areas that have not seen much avalanche activity yet this year. Examples of these areas include Ammonoosuc Ravine, Burt Ravine, Oakes Gulf, and the Webster Gullies in Crawford Notch. While we don’t expect significant natural avalanche activity, don’t completely rule out this possibility, especially if you are noticing large snow slopes rapidly loading with wind-transported snow and other clear signs of instability like shooting cracks under your feet or snow that is easily sliding off a firm layer of snow underneath. It’s worth calling out terrain traps on west-facing avalanche terrain, which are plentiful, especially in poorly-developed avalanche paths. Deep gullies, trees, and depressions can all compound the danger of getting caught in a small avalanche today. Very late tonight and early tomorrow morning, as winds shift back to the northwest, expect the possibility for another redistribution of new snow and elevated avalanche hazard in eastern ravines like Tuckerman Ravine, Gulf of Slides, and Huntington Ravine.

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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