Bulletin d’avalanche

Mt Hood

Northwest Avalanche Center
Voir sur la carte

Danger d’avalanche

Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Open full map
Périmé — ce bulletin a expiré 5 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Wind slabs will build at all elevations, but they will grow larger and easier to trigger as you ascend. Look for actively blowing snow, drifts, and firm or textured snow surfaces to help identify suspect terrain features. Navigate around steep wind-loaded features especially near ridge crests where you see these signs.

Problèmes avalancheux

  • Wind Slabs

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

    Wind slabs grew quickly on Saturday and will continue to grow overnight and through the day on Sunday. Expect to find reactive wind slabs near and above treeline and possibly below treeline on wind-exposed features and lee slopes. Strong west winds are forecast to continue and will increase the size of possible slabs. The higher you travel on the mountain, the more likely you are to trigger large slabs. Look for actively blowing snow, fresh cornice formation, and stiff or textured snow surface as a sign that you could trigger a wind slab on slopes accumulating windblown snow. Where you see these signs, navigate around steep start zones and choose slopes under 35 degrees.

    Example: Blowing snow deposits below ridgelines forming wind slabs. Photo: Shane Robinson

Avalanche Discussion

Although snowfall totals have been modest--around 2-4 inches during the day Saturday, wind transport has been substantial. Saturday morning wind slabs were reported to be shallow and isolated to near ridge crests, but by Saturday afternoon, slabs were becoming larger and more reactive. This trend should continue overnight Saturday and make triggering a wind slab likely near and above treeline. Avalanche problems should be confined to recent snow which sits above a melt-freeze crust formed during warm and sunny weather last week.

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

Régions couvertes