Avalanche forecast

Togwotee Pass

Bridger-Teton Avalanche Center
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Avalanche danger

Thu
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
No rating
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Out of date — this forecast expired 4 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Triggering a large avalanche is possible on steep, wind-drifted slopes. This possibility also exists on upper-elevation slopes that are sheltered from the wind. Cautious route-finding and conservative decision-making are essential, particularly in upper-elevation terrain or on any shallower slope. Additional snowfall is adding weight to buried weak layers in the snowpack. Some of these layers may be in the middle of the snowpack and some may be near the ground. Reduce your risk by sticking to lower-angled terrain that is sheltered from the wind. This zone is large and incredibly variable. Cautious route-finding and conservative decision-making are essential, particularly in upper-elevation terrain or on any shallower slope. 

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2

    The weight of this new snow is adding stress to a variety of weak layers in the snowpack. This stress is amplified in areas where dense wind slabs may form today.

    Our most concerning persistent weak layers sit near the middle and base of the snowpack. An avalanche failing on one of these layers has the potential to be very large, particularly in open and well-connected terrain features. Persistent weak layers are difficult to deal with. They can produce avalanches many weeks after they are buried and they provide fewer and fewer obvious signs of instability with gradual snowfall. They can break wider than you might expect and may be triggered remotely, from gentle terrain adjacent to steeper slopes.

    Additionally, wind slabs may build today along exposed ridges and in cross-loaded gullies as well as lower on slopes. Togwotee has many steep rolls and terrain trap features right off of the road. Even a small avalanche in these areas could prove deep and consequential. Cracks shooting from your boards or sled are an obvious sign that you’ve found a sensitive slab. Smaller wind slab avalanches have the potential to step down to more deeply buried weak layers resulting in a large avalanche.

    (1/7/2023)

    Persistent slab avalanche. Split Rock Creek: 9000' NE aspect

Avalanche Discussion

Feedback

Hopefully, we’ll have a larger body of evidence to pull from after this series of storms at Togwotee. I say “hopefully” because there’s an overarching "I guess we’ll wait and see if certain things avalanche naturally” mentality leading up to this storm. It’ll be interesting to see what slides and what doesn't, of course, a lot of this activity is tied to how much snow we get, where it falls, and how fast. Given the spatial variability of the current snowfall, snow depths, slab properties, and weak layers, the outcomes may vary drastically over a short distance. While these weak layers are put to the test, take a big step back and record what you see—the next several days could be interesting. The Togwotee snowpack is just maturing to a stage where we may start seeing larger avalanche cycles on the weak snowpack structure here. 

In the Greys Zone over the past week, I've found snowpack depths ranging from 12 inches to over 3 feet deep; one sub-zone had widespread melt-freeze crust from a recent clearing above 9,000 feet, even on northerly and shaded aspects, while another held soft, dry snow still even in the lower elevations. I've found buried surface hoar, thick layers of facets in the middle and base of the pack, and also thick crusts at the base of the pack with very little facet development-literally every condition in the book. Microclimate zones exist within each larger range (whether it's the west vs east of the Tetons, the differences along the Continental Divide at Togwotee, or the Salt Range vs Wyoming Range of the Greys), and each is worth getting to know closely if you are frequenting it.  With any snowpack, it's very important to recognize when you are dealing with a problem that is more complex than we as humans can typically fully understand. We can still make our best assessment with all the tools available to us, and our best bet is to always step back if surprised by something. Pad your uncertainty by building healthy margins for error into your travel practices, and tread lightly with rapidly changing snow conditions today.

 

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