Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

Hochgebirge
4 · Gross
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 6 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Very dangerous avalanche conditions are developing at the upper elevations, and travel in avalanche terrain is not recommended. Dangerous avalanche conditions exist at the mid elevations. Yesterday in Grand Teton National Park, a snowboarder triggered a 2 foot deep wind slab on a north facing aspect around 8,900 feet. He was caught, carried through extreme terrain and did not survive. Similar slides are very likely to be triggered today, and natural activity will be possible. Persistent deep slab avalanches could be human triggered, occur naturally or step down from the release of a wind slab. Involvement in one of these destructive, large to very large avalanches will almost certainly result in another fatality. It is critical for skiers and riders to choose the appropriate terrain for the current avalanche conditions. Play it safe today and come home to your friends and family; stay off of and out from underneath terrain steeper than 30 degrees.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1–2

    Overnight, westerly ridgetop winds backed to the southwest and ramped up to 30 to 40 miles per hour with gusts to 68. Available snow was easily transported onto leeward slopes and wind slabs stiffened and gained mass. Very strong winds will continue today along with moderate to heavy snowfall, and wind slabs will continue to build. Above 7,500 feet, skiers and riders are very likely to trigger these slabs with depths ranging from 2 to 5 feet. Natural activity will also be possible. Below 7,500 feet, wind slabs up to 18 inches deep could be human triggered.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2–3

    Persistent deep slab avalanches remain a serious concern. These slabs could be triggered by backcountry travelers or occur naturally. They could also step down from the release of a wind slab. Slab depths will likely be between 4 and 8 feet above 7,500 feet. If you are caught in one of these destructive slides, you will most likely not survive. Below 7,500 feet, these slabs are likely to range in depth from 2 to 4 feet.

Avalanche Discussion

A weak system will keep skies mostly cloudy overnight and bring 1 to 3 inches of new snow to the higher elevations. Skies will slowly clear during the day. Temperatures will be in the single digits and teens in the mountains and in the teens and 20’s in the valleys. West-northwest winds will diminish to speeds of 5 to 15 miles per hour. The general avalanche hazard rating is expected to be considerable. Most avalanche fatalities occur during periods of considerable and moderate avalanche hazard. Conditions are ripe for more fatal accidents. Today’s strong winds formed new wind slabs and redistributed the load on deeply buried persistent weak layers. Very large and destructive slab avalanches are likely to be triggered by humans in the Togwotee Pass and Greys River areas and are possible in the Teton area. These dangerous slabs could be four to eight feet deep and are likely to be un-survivable. Smaller surface slab avalanches formed by recent winds could also be triggered by the weight of a person. These wind slab avalanches could be 1 to 3 feet deep and can also kill people who venture onto steep slopes.

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