Lawinenlagebericht

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Lawinengefahr

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

Kernpunkte

Triggering a large avalanche 2-5 feet deep remains likely today on steep slopes at upper elevations. Watch for thin rocky areas and wind-affected snow. Slopes facing the north half of the compass hold weaker snow. Use conservative decisions around steep slopes and terrain traps. 

Lawinenprobleme

  • Persistent Slabs

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

    The persistent slab problem exists at all elevations and is most easily found on west through north through east aspects. Steep, rocky or wind-affected terrain should be approached with caution. Thin areas in the snowpack are where you are most likely to impact buried weak layers currently 2-5 feet below the surface. The depth and structure of the snowpack varies in the Greys River zone, and the best way to verify the location of weak layers is to dig or probe. The deeper the weak layer, the less likely you are to impact it with your sled or skis. When in doubt, choose lower-angle terrain and watch out for large slopes above you that could avalanche and run further than you expect.

    Cornices are growing and can break unexpectedly. Large cornices can act as large triggers and impact very deep weak layers. Warming temperatures can increase the triggering sensitivity of both cornices and slabs. Minimize time spent on slopes with cornices looming overhead. 

    (2/17/2024)

    This large avalanche was triggered by the second rider on a slope up Sheep Creek in the Snake River Range at 9,500 feet on an E aspect.

  • Wind Slabs

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

    Recent snow and wind have formed wind slabs 1-2 feet thick on a variety of aspects at upper elevations. Watch for stiff pillows and drifts around exposed terrain such as ridges, rocky areas, convexities and gullies.  Shooting cracks and collapsing indicate unstable snow beneath you. Small avalanches can easily knock you off your feet above consequential features like cliffs and terrain traps. Travel in sheltered terrain to avoid this problem.

    Small wind slab avalanches have the potential to step down and impact deeper weak layers which could result in a large avalanche.

    (2/18/2024)

    The visual ripples in the snow surface and old drifted-in avalanche crown illustrate where some areas saw more wind, and any drifted or winded snow holds a higher potential for triggering an avalanche. 

    Photo: Gabrielle Antonioli

Avalanche Discussion

A lot of ground is covered in the Greys River forecast zone. If you're riding in the Snake or Salt River mountains, you can assume a deeper snowpack.  In the Wyoming Range or Hoback however, there is less snow. In general, a deeper snowpack buries our persistent slab problem and makes it more difficult to impact weak layers. Last week's snow helped to further bury the February 2nd weak layer and we are now a few days out from a significant natural avalanche cycle and avalanche observations are trending down. However, the snowpack is still adjusting and it remains very possible to ride over a thin spot and trigger an avalanche.  

These conditions warrant a particular mindset. Large areas have more uncertainty and as a result, require a bigger safety margin. As you ride, build that margin with terrain decisions. Give large avalanche slopes above you plenty of room. Anticipate where the wind has stripped and loaded exposed terrain features knowing that it's easier to trigger an avalanche there. Look below you consider the consequences if you are caught in an avalanche. If the hairs are standing up on the back of your neck, default to lower-angle sheltered slopes where there is plenty of powder.

 

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