Lawinenlagebericht

Togwotee Pass

Bridger-Teton Avalanche Center
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Lawinengefahr

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

Kernpunkte

It will be possible to trigger avalanches in steep wind loaded terrain primarily in the upper elevations today. These slabs will be 1-2 feet thick and large enough to injure or bury a person. Below 9,000 feet avalanche activity will be limited to isolated pockets of very steep terrain.

Lawinenprobleme

  • Wind Slabs

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

    New snow and strong winds formed slabs 48 hours ago that may be sensitive to the weight of a person or machine today. It will be more likely to trigger these slabs in terrain over 35 degrees in steepness and where the wind has deposited the new snow. Large triggers such as groups and snowmobiles will also increase the odds of triggering. 

    Given the high wind speeds, expect slabs to have formed further down and across slope than normal. Slab depths will vary greatly due to the high winds as well. Watch for signs of unstable snow such as recent avalanches, shooting cracks and whoompfing. When these signs are present, move to less steep and exposed terrain.

    (2/7/2025)

    This recent small natural avalanche was noted around 9,400 feet on a NE aspect on Feb 7th. We observed an increase in wind loading and unstable snow throughout the course of the day. 

    Photo: Bridger-Teton Avalanche Center

  • Persistent Slabs

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

    Snow that fell over the first 3 days of February built slabs 2-4 feet thick. These slabs sit on a variety of interfaces, including crusts on solar aspects and facets on shaded aspects. The likelihood of triggering slabs at this interface is becoming less likely over time. The possibility remains to activate this layer, particularly in very steep terrain or in cases where an avalanche involving the recent snow increases the stress on these deeper layers in the middle of the snowpack.

    Weak snow exists near the base of the snowpack but remains dormant. Avalanches failing at or near the ground are unlikely and would fall into the outlier category.

    While the likelihood is on the low end of the scale, it remains important to stack the odds in your favor by following safe travel protocol. Travel one at a time across steep terrain, use islands of safety and communicate with your partners.

    (2/4/2025)

    A slab avalanche that likely released on the Jan 31 interface, estimated to have occured on Feb 4.

Avalanche Discussion

Avalanches involving “day old” wind slabs are the most likely problem to encounter today. Activity likely peaked two days ago in step with the combination of intense precipitation and high winds. Observations indicated this instability 2 days ago near Brooks Lake. Expect the snow to be less reactive than yesterday, but still unstable in steep wind loaded terrain.

The Jan 31 interface consisting of crusts and facets remains on the radar. This layer was buried by 3-4 feet of snow containing 4” of Snow water equivalent. Since that layer was buried 5 days ago, temperatures have been warm, rain has fallen up to 9,000 feet, new snow and wind has stressed the snowpack, and temperatures have now cooled back down. In summary, the snowpack has been put to the test by the weather. While observations have been limited, the lack of reported activity at these depths, combined with these weather factors paint a picture of gradually improving stability at this interface.

If you see avalanche activity today, please consider submitting an observation HERE. Observations allow everyone to gain a better and more complete understanding of conditions. Thanks!

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