Lawinenlagebericht

Togwotee Pass

Bridger-Teton Avalanche Center
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Lawinengefahr

Sat
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
Keine Stufe
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Veraltet — dieser Lagebericht ist 3 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Human triggered avalanches remain possible at ALL ELEVATIONS. Slopes where wind affected snow overlies buried weak layers are of primary concern. Steep and rocky terrain near ridglines and summits likely harbors weak snow near the bottom of the snowpack and wind affected snow on top. Moniter the effects of the sun on the snow surface today and limit exposure time on steep sunlit slopes. Pay attention to signs of instability such as audible collapsing of the snowpack and cracking within wind affected snow. 

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1.5–2.5

    Layers of weak snow exist within the top meter of the snowpack and deeper. The most recent snow lies on top of multiple crust/facet combinations that formed in March and February. Thes layers have been recently reactive on Angle Mountain and Mt. Leidy.  Triggering a 2-3+' thick persistent slab avalanche still remains a possibility. You're most likely to trigger a slide involving this weak snow on or adjacent to very steep slopes (steeper than about 35 degrees) where the wind has built slabs in recent days and weeks. 

    Deeper weak layers formed earlier in the season composed of crusts, facets, and depth hoar remain a concern. Triggering a wind slab or persistent slab on the March 20th interface could step down to these layers resulting in a large to very large avalanche.

    Recent size D2 Avalanche on Angle Mountain

  • Wind Slabs

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

    Stubborn wind slabs that are 1-2 feet thick linger throughout the forecast area. Easterly winds on Tuesday helped to form cohesive slabs of snow in unsual locations. Look for wind rippled snow surfaces and pay attention to signs of instability such as cracking within wind drifted snow. 

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–1.5

    Today warm temperatures and sunshine could cause small wet loose avalanches to form on south facign terrain at the lower elevations on Togwotee Pass. Look for signs of instability such as roller balls and tree bombs. 

Avalanche Discussion

Spring warm up continues today, with above freezing temperatures expected from the valley floor to the highest peaks. Clouds could gradually increase throughout the day as a moisture starved short-wave trough begins to impact the area tonight. These clouds could mitigate some wet loose development at the lower elevations but there is some uncertainty surrounding this situation. Wind slabs are prevalent in the alpine and their sensitivity to triggers could increase with solar input.

Recent avalanche activity was observed in Avalanche Canyon yesterday, mostly wind slabs that were size 1.5 or less. 

Have left the 3/20 and 3/29 persistent slab problems in place for now, but sensitivity is expected to go down after the peak heating today and subsequent refreeze tonight. Clouds should mitigate some solar impacts tomorrow, and then we are back into full on high pressure with seasonal to above average temperatures. Looking at the long term forecast it's not looking very snowy for April right now, but that could obviously change. 

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