Lawinenlagebericht

Togwotee Pass

Bridger-Teton Avalanche Center
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Lawinengefahr

Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
Keine Stufe
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Kernpunkte

Dangerous avalanche conditions exist. The National Weather Service has issued a Winter Storm Warning through 6 PM tonight. Two primary avalanche problems confront backcountry users today. First, skiers and riders are likely to trigger newly developed wind slabs ranging in depth from one to two feet. These slabs might also release naturally. Second, deep persistent slabs could release naturally, be human triggered or step down from the release of a wind slab above. As the day progresses, slide depths and volumes will continue to increase for both avalanche problems. Avalanches are unlikely below 7,500 feet where the snowpack is shallow. Cautious route finding and conservative decision making will be essential for safe travel in avalanche terrain today.

Lawinenprobleme

  • Wind Slabs

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

    Strong southwesterly ridgetop winds and abundant snowfall have created new winds slabs. These slabs are building upon snow surfaces that faceted during the cold spell earlier in the week. Temperatures have continued to warm since yesterday afternoon, which has likely created upside-down conditions with heavy snow overlying lighter density snow. Backcountry travelers choosing to venture into avalanche terrain are likely to trigger these slabs to depths of one to two feet.

  • Deep Persistent Slabs

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

    Deep persistent slabs, which lie upon a faceted snow/rain crust combination in terrain that held snow from early October, are likely to release naturally or be triggered by skiers and riders. The likelihood of these slabs releasing will continue to rise as additional snowfall increases the load on the buried persistent weak layer. These hard slabs are likely to be two to four feet deep and could break out high in the starting zones. These slabs have the potential to serious harm or kill backcountry travelers.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )The National Weather Service has issued a Winter Storm Warning for Western Wyoming through 6 PM on Saturday. Strong westerly flow combined with ample Pacific moisture will bring another significant snowfall event to the region. Expect 12 to 24 inches of new snow in the mountains by Saturday evening. Strong southwesterly ridgetop winds at 20 to 30 miles per hour will accompany this snowfall. Overnight lows in the mountains will be near 20 before rising into the mid 20s during the day.The general avalanche hazard is expected to rise to HIGH. As the day progresses, the chance of triggering newly developed soft slabs will increase and become very likely by the end of the day. These slabs, which could also release naturally, are forming on faceted snow and could reach depths of three feet by Saturday evening. In terrain that held snow from early October, deep persistent slabs are likely to release naturally or be human triggered. In the Tetons, these slabs could have depths ranging from four to six feet. Slab depths are expected to be in the three to five foot range in the Greys River forecast zone and around two to four feet deep in the Togwotee Pass area. TRAVEL IN AVALANCHE TERRAIN IS NOT RECOMMENDED WHEN HIGH AVALANCHE HAZARD EXISTS.

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