Bollettino valanghe

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Pericolo valanghe

Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
1 · Debole
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In sintesi

A buried weak layer creates the potential for human triggered slab avalanches in steep terrain today. Recently wind loaded slopes have added a load to that layer that has been reactive to human triggering in isolated areas and has been triggered from a distance. While the threat of natural avalanches has passed, a skier or rider could find the weak spot in the slab and cause a much larger than expected avalanche. Slab thickness could be five feet thick and possibly thicker in heavily loaded slopes such as beneath cliffs or ridge tops. Careful snowpack and terrain evaluation and cautious route finding is advised today. Lower elevations have less snow coverage making it unlikely to trigger an avalanche. Plenty of safe riding exists on lower angled slopes in wind sheltered areas where no slab exists over the buried weak layer.

Problemi valanghivi

  • Persistent Slabs

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

    Buried, weak faceted snow remains a layer of concern in terrain above 8500 feet. This avalanche type could be triggered from a connected slope near a steeper slope or from below. A very large avalanche could occur on this problem layer especially where a thick slabs of wind drifted snow lie on top. A slab avalanche with a crown up approximately eight feet thick was reported on Monday on a heavily wind loaded slope west of the Tetons. Several other smaller but still potentially dangerous avalanches of this type have been reported in the past several days. Remember that the several riders could lay tracks on a slope before the finding the weak spot that triggers a slope.

  • Wind Slabs

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

    Strong wind during the recent period of snowfall has drifted snow onto wind sheltered slopes and ridgetops. Signs of wind loading include cornices, wind textured surfaces and stiffer surface snow underfoot. These slabs are likely to be stubborn in most areas and anywhere between six inches and three feet thick.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )Arctic air will remain in place tonight and into tomorrow. Expect mountain lows tonight between -10 and -15 and rising to the negative single digits tomorrow. Ridge top winds will be in the 10-15 mph range with a trace to an inch of snow falling overnight and another inch or two falling late in the day tomorrow.As recent wind slabs and storm snow settles and bonds, the risk of natural avalanches continues to decline. Unfortunately, the recent loading increased the strain on the weak layer associated with the Dec 5 crust. This persistent slab remains a real concern. Where our two avalanche problem types converge is where you could trigger the largest avalanche with slab thicknesses five or more feet thick in the Tetons and possibly Grey’s River area, with smaller slabs up to 3 feet possible at Togwotee. Steep slopes and areas above 8,500’ where this layer is especially weak or overloaded will continue to hold the potential for these large avalanches that will be easily capable of burying a person. The avalanche danger will be Moderate at middle and upper elevations of all zones tomorrow but you will need to evaluate the snowpack and terrain carefully before committing to a slope.

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