Bollettino valanghe

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Pericolo valanghe

Fri
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

The new snow that fell yesterday added strain to a weak layer buried last week. Widespread collapsing and avalanches have been reported on this weak layer. Avalanches triggered on this layer today could be large enough to bury a person or push a rider into rocks that lie barely covered by our early-season snowpack. Be cautious when entering steep, mostly shaded aspects that harbor weaker and older layers.

Problemi valanghivi

  • Persistent Slabs

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

    It is possible for a skier or rider to trigger an avalanche on this layer at middle and upper elevations where October snow developed weak crystals near or on the old surface. Natural and human-triggered avalanches have occurred on this layer since November 2nd. The weak layer is buried deeply enough now to create an avalanche large enough to bury a person. These slabs are likely to be 1-2’ thick and up to 3’ thick along ridges where the wind has drifted snow. You can read more about this layer in recent observations from Togwotee, Targhee, and Teton Pass.

    Areas like this one where new snow has drifted beneath cliffs can create slabs 3 feet thick or more. This, and other avalanches, failed on weak snow during control work at JHMR.

Avalanche Discussion

Our early-season snowpack has grown substantially over the past few days. Skiing and riding have been mostly limited to smoother slopes at mid and upper elevations though there is now close to 12-18" of snow on the ground at 7,000'. The new snow also created some complexity to the snowpack when it more deeply buried the surface hoar and near surface facets that grew during the dry period following the snowfall October 22-27. That layer now has been loaded with 3-4" of snow water equivalent and is showing the strain. Widespread collapsing along with some decent-sized avalanches yesterday triggered with explosives point to a reactive snowpack. Experienced people have been backing off of objectives due to scary test pit results and significant whumpfing. Low-angle slopes without many obstacles may be your best bet for skiing or riding though it's still a gamble with the thin snowpack. 

Weak layers evolve and heal at different rates depending on aspect, elevation, weather, and range. Understanding these patterns takes time, particularly in the early season, and requires diligence and monitoring. Snap a photo of any avalanches you see or make note of any collapses and cracking in the snow surface. Submitting snowpit data also helps us paint the picture of what is happening across our ranges. The more data we get,  the easier it is to collectively make safer decisions on where to play.

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