Boletín de aludes

Tetons

Bridger-Teton Avalanche Center
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Peligro de aludes

Fri
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

Strong wind and significant snowfall has formed fresh wind slabs and added stress to buried persistent weak layers creating dangerous avalanche conditions. Triggering an avalanche is most likely on wind-loaded slopes, but still possible in sheltered terrain. Persistent slab avalanches can behave in unpredictable ways. Stick to lower angle slopes and avoid steep, wind loaded terrain as the snowpack undergoes rapid change.

Problemas de aludes

  • Wind Slabs

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

    14-20 inches of snow has fallen over the last 48 hours. West to southwest wind increased yesterday afternoon through the evening forming fresh slabs up to 2 feet deep. These will be sensitive to the weight of skiers and riders today. Expect to find deeper and more reactive slabs above 9,500’ where stronger wind loading occurred. Look for obvious signs of wind affected terrain such as large drifts, stiffened surfaces, or shooting cracks. Be aware that wind slabs have the potential to break deeper and step down to buried weak layers. 

    (2/17/2026)

    This wind slab occurred two days ago on leeward terrain in a confined feature. 

  • Persistent Slabs

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

    Triggering a soft or hard slab avalanche up to 3 feet deep is possible on buried weak layers of facets and surface hoar, and more likely on northerly aspects. The highest concentration of avalanche activity over the last week was from 8,000’-9,500’ on sheltered N-NE aspects. Other aspects cannot be ruled out given the spotty distribution of these weak layers. For this reason, some slopes may appear stable while others are not. Knowing which slopes contain weak faceted snow or surface hoar is difficult without thorough snowpack assessment. Buried surface hoar is notorious for propagating far cross-slope and being remotely triggered from gentle terrain above, below, or beside steep slopes.

    Slopes that are wind loaded and harbor buried weak layers will be most dangerous today.Most avalanche activity observed has been on the west and south side of the Tetons where weak layers have been more widespread and pronounced. 

    (2/14/2026)

    Recent avalanches on the west side of the Tetons show the propensity for avalanches to propagate signifcantly across slope. 

    Photo: Cameron Huffman

Avalanche Discussion

Storm Cycle

The storm over the last 72 hours has added up to 20” of snow with 1.8” of snow water equivalent onto weak layers with complex variability. This weak snow was formed during a month long dry period in January, and has been found on terrain sheltered from the sun and wind prior to the initial burial. The type of weak snow varies from thick layers of dry facets to dangerous preserved surface hoar. Knowing which slopes contain these weak layers is difficult without digging down to investigate. Digging a quick pit can provide valuable insight about the distribution of these weak layers. Expect these weak layers to be reactive today as they adjust to the recent load of snow. Plan your backcountry travels accordingly to avoid areas that could harbor these weak layers.

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