Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
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Pericolo valanghe

Mon
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 6 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Human-triggered wind slab avalanches 1-2 feet thick are possible today. Look out for wind affected snow on steep, lee slopes.  While the chance for triggering a deeper weak layer has diminished, it's a good idea to dig to look for it before committing to terrain over 35 degrees. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Snow which fell over the past several days has drifted and formed slabs in wind exposed areas. These slabs may be up to eighteen inches or perhaps two feet deep, are likely to be soft and may be sensitive to triggering. Wind sculpted surfaces and shooting cracks signal danger.  You are most likely to find these slabs above 8,500', near ridgetops and around cliffs. Warming temperatures may make these slabs more reactive until they settle.

     

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1.5–3

    Weak snow from January lies 2-4 feet below  the snow's surface. Though this drought layer has gained strength with time, triggering a large and widely propagating avalanche remains possible, especially in very steep terrain above about 8,000'. This problem continues to deserve respect, especially in high consequence terrain and places where the slab may be thin enough for the weight of a person or snowmachine to hit the weak layer. Avalanches on this layer are stubbron to trigger and unlikely to produce any warning signs like collapsing.

    Cornice Fall: Large triggers such as a falling cornice could trigger a larger avalanche. While unlikely, it's a good idea to give cornices some space.

     

    2/28/2026

    A large avalanche south of JHMR that failed on weak snow in the middle of the snowpack. The avalanche was likely triggered by a piece of falling cornice. Most recent persistent slab avalanche events have occurred on the west and south side of the Tetons.

Avalanche Discussion

A series of small storms with moderate winds over the past several days have produced fresh slabs of wind-drifted snow across upper-elevation terrain. In many areas these slabs are forming on a weak interface, creating the potential for human-triggered avalanches up to about two feet deep. Warming temperatures have helped to make this snow upside-down. 

A deeper, more persistent problem remains in parts of the snowpack, especially on shaded slopes.. While activity on this layer has been inconsistent, it still has the potential to produce larger, more destructive avalanches if triggered from shallow areas or near rocky features. Weak layers like this can linger long after storms have passed and can surprise travelers who assume the snowpack has stabilized.

Travelers today should watch for signs of instability such as recent avalanche activity, cracking in the snow surface, or hollow-feeling wind slabs. If you encounter these red flags, avoid steep, wind-loaded slopes and move to lower-angle terrain where you’ll find softer snow without wind-affect.

Thanks for submitting your observations. Please continue to share even when the weather and snow is uninspiring. Observations remain helpful even in the absence of avalanches!

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