Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
Auf der Karte ansehen

Lawinengefahr

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

Kernpunkte

Dangerous avalanche conditions exist. Human triggered avalanches are likely in steep terrain in the mid and upper elevations today. Natural avalanches are also possible. Travel in avalanche terrain requires careful route finding and an awareness of terrain above. The danger will be CONSIDERABLE and rise to HIGH late in the day as a continuing storm brings high snowfall rates and increased winds.

An avalanche warning will be issued beginning at 6pm tonight and will be in effect until 6pm Sunday.

Lawinenprobleme

  • Wind Slabs

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

    New snow and wind over the last 48 hours has created unstable conditions. Steep wind loaded terrain in the middle and upper elevations are the most likely places to encounter unstable snow in the form of wind slabs 1-3 feet thick. In the lower elevations expect to encounter isolated pockets of unstable snow up to 1 foot in depth in steep terrain. While wind slabs are the most likely type of avalanche to trigger, don’t rule out slabs unaffected by the wind. Continued snowfall and winds throughout the day will increase the size and sensitivity of these slabs. 

    Natural activity is possible within the new snow. Human triggered avalanches are likely. There were reports of a few human triggered avalanches yesterday in the 8-12” deep range. Expect more of the same today. Pay attention to obvious signs of instability such as avalanches, shooting cracks and collapsing. Back off of terrain when these signs are present. Be aware of terrain and other groups above, as avalanches have the potential to be large and run long distances.

    (12/27/2024)

    Skier triggered avalanche above Phillips Bench. North aspect at 9.600. Approximate slab depth 1 foot.

    Photo: Pete Ginsbury

  • Persistent Slabs

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

    Weak layers of snow buried 2-4 feet deep remain a possible threat today. One avalanche outside of the boundary at Grand Targhee resort was triggered by a skier yesterday on this deeper weak layer. Fortunately this person walked away unharmed. This problem exists predominantly on steep terrain in the upper elevations on the north half of the compass. Avalanches involving the new snow have the potential to step down to these layers, producing large and potentially unsurvivable avalanches. The likelihood of this layer reawakening is not widespread yet, but yesterday's avalanche is a wake up call to keep this on your radar today.

    (12/27/2024)

    Skier triggered avalanche outside of the resort boudnary at Grand Targhee.  NE aspect at 9,500 feet. Approximate slab depth 2.5 feet.

    Photo: Daniel Nagy

Avalanche Discussion

New snow over the last 48 hours has created instability in the upper snowpack. There were several reports of human triggered avalanches yesterday in the mid and upper elevations. Slab depths were generally less than a foot, with some exceptions. Expect more of the same today, as snow continues to stack up and the winds create upside down conditions. Make sure to match terrain choices with the conditions. These conditions require avoidance in order to stay out of harm's way. That means sticking to lower angle slopes, away from wind loaded areas and creating a wider buffer than normal. 

Expect the danger to be on the rise as we move into the evening hours today. Peak loading is expected to occur during the day tomorrow. By tomorrow night the cumulative SWE for this storm cycle will approach 4”. This will increase the chances of more widespread activity, both natural and human triggered.

Abgedeckte Regionen