Bulletin d’avalanche

Presidential Range

Mount Washington Avalanche Center
Voir sur la carte

Danger d’avalanche

Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Open full map
Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Avalanche danger is rising through the day. Natural and human triggered avalanches will become increasingly likely as the snow piles up. Reduce your risk by keeping an eye on wind direction: when the direction is from the northwest, large natural avalanches will become possible in east facing ravines.  

Problèmes avalancheux

  • Wind Slabs

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

    Wind and new snow will build wind slabs which may struggle to stick to a firm bed surface. Light east winds through mid-day will build wind slabs on western aspects. These wind slabs will likely be reactive to a human trigger due to the relatively low wind speeds and snow density, while lack of developed bed surfaces will work to limit the potential avalanche size. 

    When the wind shifts through the north and then northwest late in the day, watch out for significant snow loading in east facing ravines. Given the wind speeds, wind slabs up to 3 feet thick are possible at mid elevations. Light to moderate wind speeds in the forecast result in slabs that are sensitive to a human trigger, and may release naturally on developed bed surfaces.  Wind loading at the ridgelines will be the big red flag to watch for. If views are obscured, look for signs of drifting snow around you as a clue to what’s happening overhead. 

    Low elevelation gullies in Crawfords Notch will likely see some amount of wind slabs building in gully tops especially on Mt Webster as the wind passes through the top of the compass. 

  • Loose Dry

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

    The 5 to 10 inches of snow blanketing the terrain at all elevations may not bond well to a firm icy surface. On the steepest terrain, it may be possible to start the loose new snow sliding down hill. Avalanches may be on the smaller side, but consequential in steep terrain if you get pulled off your feet.

Avalanche Discussion

While this avalanche forecast is a snapshot view, avalanche danger today will change throughout the day with the wind direction as the main factor driving the avalanche problems. The Loose Dry avalanche problem will be shadowed by the more dangerous Wind Slab problem. Visibility will be poor, but keep in mind the wind will be shifting northwest later in the day. If the wind shifts early, we may see wind loading snow in the eastern ravines earlier than expected. 

Taking a broader view, it’s time to start thinking about the more fully developed snowpack. Recent storms have worked to fill in more avalanche paths and overall they have become more connected in the terrain, capable of producing a larger avalanche. 

The Lion Head Summer Trail is OPEN this morning. Drifting snow  will increase the avalanche hazard on the trail, potentially driving a switch to the Winter Lion Head Trail tomorrow. 

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. 

Régions couvertes