Avalanche forecast

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Avalanche danger

Thu
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
2 · Moderate
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Out of date — this forecast expired 4 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Conditions remain dangerous. Triggering a large avalanche is likely on steep slopes in the upper elevations. Skiers and riders should choose low-angle terrain that isn't threatened by steeper slopes above. People have reported avalanches in the Greys Zone each of the last four days.

A large avalanche triggered by several parties on Mt. Taylor two days ago illustrates this hazard. Skier-triggered avalanche on Mt. Taylor

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–2.5

    We have received enough recent snowfall that these slabs could produce a large enough avalanche to bury you (and possibly your car) and break 2-3+ feet in depth. Additionally, there is the possibility of a slide stepping down into the deeper persistent weak layers described below. 

    Wind-loaded slopes will have even more weight on weaker layers, and wind-affected areas are likely to have variable snow depths and spots where you can more easily impact these layers. These new drifts are adding more weight to the persistent weak layer, and triggering one could step down deeper to become a much bigger avalanche.

    (1/30/2023)

    Small avalanches on SE aspects of Horse Creek in the Greys River Zone. We suspected these would be larger to the south and west parts of the range as well as in the Palisades.

    Photo: Frank Carus

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely
    Size
    2–3

    This problem will remain on the table until more evidence has cleared it, particularly with how large and variable the snowpack is in this zone. Keep an eye on the recent observations for updates on what riders are finding in areas you frequent. Looking for evidence of shallower slopes in the middle and upper elevations, probing for snow depths, and digging in shallow areas can help identify if where you are recreating still has this problem. Weak snow exists near the base and middle of the snowpack here to vastly varying degrees. The recent loading of 2.5 inches of snow water equivalent has added additional stress to this weak layer.  When persistent weak layers become deeply buried beneath a dense slab, it presents a tricky scenario. Avalanches on this layer have become harder to trigger, but the resulting slide would be catastrophic.

    These weak layers may be more easily impacted by your weight at mid-elevations where the slab is thinner, or in rocky and/or wind-affected areas where there are shallower areas. Areas with the highest likelihood of triggering this layer are on the southern half of the compass above 8000’. 

    Avoiding terrain where both of these problems overlap is key.

Avalanche Discussion

At the risk of undermining any notion of expertise you may think I possess, I've made plenty of bad decisions in avalanche terrain. I'm eternally skeptical of myself. Not to a point that is paralyzing, but I think about how I think about everything- a lot. We are all fallible, and I find it best for my practice to own that and talk about it openly. How else does one receive feedback when the environment won't provide it? I usually seek it from friends, mentors, or any objective third party. I encourage you to do the same if you don't already. Triggering an avalanche is not great because it may injure or kill us, or others. But is also nothing to be ashamed of, particularly if we were striving to make the best decisions. It is an inherent part of playing the backcountry game, where feedback is so poor that plenty of bad decisions end in nothing happening, or sometimes even, great skiing. 

There hasn't been significant loading for several days, so are avalanche conditions becoming safer? The answer is an emphatic "No". There are two important points to consider:

1) The buried weak layer is especially bad due to a well-developed and widespread nature

2) This weak layer has received a rapid and large snowfall with increasing winds.

These factors, especially in combination, have produced an instability that could be long-lasting and unpredictable. Even as we head into a period of more stable weather, I wouldn't be surprised if people are triggering avalanches a week from today. Throw human behavior into the mix, and one could argue that conditions are becoming more dangerous. As time goes by and the obvious signs of instability diminish, it requires more and more discipline to choose the appropriate terrain.

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