Lawinenlagebericht

Snake River Range

Bridger-Teton Avalanche Center
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Lawinengefahr

Fri
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

Human-triggered avalanches on buried weak layers have been frequent in this zone and now they will be larger and possibly more widespread. Slabs could be up to 4 feet thick in wind-loaded terrain and 2-3 feet thick in wind-sheltered terrain. Avalanches could occur without signs of instability, though you may hear collapsing, and could be triggered from a distance, beside or beneath a slope. Ride low angle terrain under 30 degrees and allow time for the weak snow to adjust to the new load from the most recent winter storm.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1.5–3

    Recent snowfall has further stressed the January drought layer that's responsible for avalanches every day of the past week.   Most of the avalanche activity prior to the recent winter storm has been on N and NE aspects above 7,500' but the 2 inches of water weight (in 12" new snow) could tip the balance towards instability on more aspects. This added weight of recent snow will also make the prime aspects (N-NE) even more reactive with even thicker slabs. The spotty distribution of these weak layers should be considered as you may not see avalanches or signs of instability in your travels before triggering a slab. If you do hear collapsing, seek out lower angled terrain without overhead hazard.

    Now is a good time to reel in your desires for steep slopes and rowdy lines until we better understand the behavior of the current snowpack.  Recent avalanches have been triggered from a distance, a trend likely to continue. Today is no time to FAFO on consequential slopes, especially over terrain traps.

  • Wind Slabs

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

    Strong and extreme winds formed wind slabs 2-3 feet thick yesterday. Expect to find them down to mid-elevations due to the high velocity and sustained nature of these southwest and westerly winds. Warm temperatures yesterday encouraged increased stability but very steep terrain may still be sensitive to triggered.  Be particularly suspicious of wind loaded areas where weak snow that formed in January has been most reactive such as the West Side, southern Tetons and south of the Teton Pass.

Avalanche Discussion

Temperatures warmed through the recent storm creating an upside down situation that was then capped by rain and mixed forms which are now a crust up to about 8,000'.  Above 8,000', riding conditions improve though snow is certainly dense. Wet loose slides below that elevation were observed yesterday though most were harmless and involved the upper six inches of the recent snow. Today's temperatures and wind should be cool enough to limit further wet activity but consider the destabilizing effect of sunshine on the upper snowpack in wind sheltered, confined and/or rocky terrain. A firm crust is present beneath the new snow on solar aspects which may not be entiorely bonded to the recent storm snow.

Abgedeckte Regionen