Bulletin d’avalanche

Galena Summit & Eastern Mtns

Sawtooth Avalanche Center
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Danger d’avalanche

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

Points saillants

You're most likely to trigger an avalanche in areas with stiff drifts or slabs near the snow surface. These slabs could break down to buried weak layers, causing a very large, destructive avalanche. Avalanches can be triggered from low-angle terrain, far from where the slide releases. Loose snow avalanches may occur on very steep slopes that soften in the sun.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Triggering a large, destructive 2-4 foot thick avalanche is possible. These slides will fail on persistent weak layers (crusts, crusts and facets, or facets) in the middle or bottom of the snowpack. You're most likely to trigger one of these slides in shallower snowpacks and on slopes commonly exposed to the wind.

    Numerous natural and human-triggered avalanches have been observed in this zone over the past week (Observations and Avalanches). Avalanches have occurred on all aspects, primarily in wind-loaded, alpine terrain.

    Persistent Slab avalanches can release in surprising ways. You can trigger them from flat or low-angle terrain long distances away from steep slopes, and they can break far above you. They can break hundreds or thousands of feet wide and after several riders or skiers have safely crossed the slope. Before triggering an avalanche, you may not experience snowpack collapsing or other obvious signs of instability.

    (3/6/2024) A very large, natural avalanche on a south aspect near 11000' on Lorenzo Peak (Silver Ck drainage) in the Boulder Mtns. 

  • Loose Wet

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

    Wet loose avalanches may release on very steep, rocky, wind-sheltered terrain soaking in the sun. These are more likely as the sun softens crusts this afternoon. Pinwheels or herds of rollerballs on a slope indicate the snow surface is softening, and loose snow avalanches may soon follow.

    Most of these slides will be small and relatively harmless; however, large slopes, chutes, and couloirs could produce powerful slides that could easily catch, injure, or bury people. Don't underestimate the power of these slides. Be aware of the terrain above you and where an avalanche could carry you.  

    (3/6/2024) Loose snow avalanches caused by warming from the sun. Photo: Sun Valley Heli Ski

Avalanche Discussion

As skies cleared Wednesday we observed several large to very large avalanches on various aspects in the Sawtooths, Smokys, Boulders, Soldiers, and the mountains around the Wood River Valley (Avalanches). Some of these slides appeared quite crisp, releasing at the tail end of Tuesday's storm. Many broke hundreds to thousands of feet wide, involving one of the multiple weak layers of snow buried in the snowpack. Most of these occurred in wind-drifted, alpine terrain.

Avoiding slopes with stiff drifts or slabs near the snow surface is the best way to reduce your odds of triggering a large avalanche.  As you climb into winder terrain you'll find recently formed wind slabs and variably thinner snowpack areas where triggering a Persistent Slab avalanche is more likely. 

So far, light wind and cool temperatures have kept wet avalanche activity at bay. Today, temperatures will be 5 to 7 degrees warmer with intermittent, calm, and light wind. This may encourage some steep, rocky slopes to shed their recent snow. Avoid lingering beneath these slopes, especially as crusts soften this afternoon.

Régions couvertes