Boletín de aludes

Galena Summit & Eastern Mtns

Sawtooth Avalanche Center
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Peligro de aludes

Mon
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 6 months ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Large human-triggered avalanches are most likely on slopes where wind has formed drifts and slabs. In terrain sheltered from the wind, triggering large avalanches is possible. On slopes that face the sun, loose snow avalanches will become likely once surfaces become moist or wet. 

 

Problemas de aludes

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2

    Sun and warmth-induced loose snow avalanches are likely on steep slopes that face the sun. The soft, fluffy surface snow won't take much heat or sun to weaken. Natural and easily triggerable loose avalanches are expected as the day warms. These slides often initiate near the base of trees and rocks, gathering snow and growing in size as they move downhill. 

    Rollerballs, pinwheels, and trenchy trail-breaking are bullseye observations signalling that the snow is heating up, and wet avalanches may soon follow. Even small slides can be consequential above terrain traps such as gullies, creeks, and thick timber. Plan your day to avoid lingering under big avalanche paths longer than needed.

    While relatively small on their own, loose snow avalanches could trigger larger slab avalanches as described above.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–2.5

    Yesterday, a skier triggered a large avalanche near the Banner zone. Fortunately, they were able to ski off the moving snow. This avalanche likely failed about 2’ deep on the weak sugary facets that formed during the Jan/Feb drought.

    Triggering similar avalanches today is most likely in recently wind-loaded terrain. The recent storms built slabs above multiple layers of weak facets, surface hoar, and crust-facet combinations on many middle and upper-elevation slopes. In the past week, there have been 12 reported human-triggered slides failing on these weak layers. These avalanches were all between 8500' and 9500' on NW-N-NE facing slopes with wind-affected surfaces. 

    Persistent Slabs can release in surprising ways. They can be much wider than expected and be triggered remotely—from flat terrain below, above, and to the sides of steep slopes.

    Avoiding steep wind-loaded slopes is the best way to avoid trouble today, but recognize that avalanches are also possible in steep wind-sheltered terrain. Snowpack cracking and collapsing are clear signs of unstable conditions.

    Additional Discussion: Whether a weak layer exists or not, the combination of recent snowfall and moderate to strong winds formed slabs that may remain sensitive to your weight. Look for wind-affected surfaces, dunes, or drifts.  Feel for stiff slabs overlying weaker or softer snow. These often form near exposed ridgelines. These smaller wind slabs, once moving, are an effective trigger for the larger Persistent Slab avalanches described above.

    (2/21/2026)

    This avalanche was triggered remotely, from a distance, and failed on weak sugary facets on a crust.

    ESE 9000' Baker Creek

    Photo: Sawtooth Avalanche Center

Avalanche Discussion

Yesterday, a skier narrowly skied out of a large avalanche near Banner Summit. Two others remotely triggered avalanches near Banner Summit and up Baker Creek (observation). Our current situation is ripe for accidents. A long drought during January and early February left powder seekers eager. During that period, weak layers developed throughout our area. A significant storm finally arrived earlier this week, enhancing the riding conditions but burying those weak layers. In response to the new snow and wind, we experienced an avalanche cycle. Now, a few days have passed, and the likelihood of avalanches has gradually decreased. Obvious signs of instability are becoming less reliable, which may give you a false sense of security while traveling through terrain. The first sign of instability could be an avalanche you trigger. 

The snowpack hates rapid change, and well, today, it's changing. We’re heading into the warmest day since receiving about 2' of new snow earlier this week. As the weather warms, the dry surface snow may turn into denser slabs in shaded terrain. On sunny slopes, the sun and warm temperatures will cause the upper snow to weaken, and we expect to see loose snow avalanches occurring on steep slopes. Either could be enough to trigger larger avalanches, failing on weak layers deeper in the snowpack. 

Many people, myself included, are keen to make deep trenches in the snow. Remember, this will not be the last weekend to ride powder. As we head out to enjoy the snow, we'll be managing our terrain selection by choosing lower-angle slopes without overhead hazards. 

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