Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

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

Kernpunkte

Stubborn, isolated pockets of firm slabs above weak surfaces could still be found in upper elevations, mainly above treeline or near cliff features. Otherwise, you will find mostly stable avalanche conditions until the late afternoon as new snow and wind forms fresh, small slabs. Monitor the amount of snow accumulation during the day and look for signs of instability in the new snow such as cracking, stiff slabs, and drifts.

Lawinenprobleme

  • Wind Slabs

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

    4-6” of new snow with light to moderate SE to SW wind is expected during the day potentially forming small wind slabs less than a foot deep. This new snow will fall on a variety of old surfaces including facets, hard windpack, and crusts. Monitor the amount of new snow (especially if snowfall exceeds forecasted totals) and how well it bonds to these old surfaces to track instability as snow continues this week. Small storm slabs failing on the old/new interface less than 6” deep could be possible by this afternoon as temperatures increase creating upside conditions. Old wind slabs will be stubborn to trigger today. Very isolated pockets could still be found in steep, exposed terrain in upper elevations.

    (3/16/2023) Photo: Daniel Nagy

Avalanche Discussion

Goodbye Sun, Hello Snow

Today we transition from one of the longer periods of clear and sunny conditions we’ve seen all winter back into the Teton trickle. This week we saw a prolonged cycle of 12-16” deep human triggered wind slab avalanches. These wind slabs were reactive due to the poor new/old snow interface. There has been discussion about whether this is now a persistent slab problem. This seems unlikely due to the large daily temperature fluctuations helping bond this interface. Yesterday was the first day of no reported avalanches, with observations confirming this interface is trending stable. Isolated pockets may still be found in the alpine that holds a unique, spatially variable snowpack where this interface is still sensitive. Otherwise any avalanche concerns today will be focused on new snow. Forecasted snowfall totals during the day should be less than 6” with fairly calm winds. Snowfall will continue this week increasing the avalanche danger. The variety of snow surfaces created by strong solar radiation, winds, and cold nights has created poor interfaces for this new snow. Today is a good day to test the reactivity while snow totals are low by performing hand shear tests and finding small test slopes. Figure out the sensitivity and distribution of this interface across different aspects to set yourself up for the coming week of powder riding.

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