Bollettino valanghe

Sawtooth & Western Smoky Mtns

Sawtooth Avalanche Center
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Pericolo valanghe

Sat
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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In sintesi

You're most likely to trigger an avalanche in areas with stiff drifts or slabs near the snow surface. These slabs have the potential to break down to buried weak layers, causing a very large, destructive avalanche. Loose snow avalanches are possible on very steep slopes that soften in the sun.

Problemi valanghivi

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    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

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3

    Triggering a large, destructive 3-6 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 beasts in steep, rocky, wind-swept alpine terrain and in the northeastern corner of this zone. Here, thin areas of the snowpack make it easier to trigger avalanches.

    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. Before triggering an avalanche, you probably won't experience snowpack collapsing or other obvious signs of instability. 

     

    (3/6/2024) Natural slab and loose snow avalanches in alpine terrain on SE-E/NE aspects near the Finger of Fate in the Sawtooth Mtns. 

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.

Regioni coperte