Avalanche forecast

Tetons

Bridger-Teton Avalanche Center
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Avalanche danger

Wed
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

Several layers of weak snow are buried in the snowpack. Recent snowfall has added weight to these weak layers, particularly in areas where winds built drifts and slabs. As the likelihood of triggering an avalanche on these layers gradually decreases, the possibility remains. Make your terrain selection accordingly and be alert to the consequences of being caught in a slide where you are traveling. Bright sunshine between periods of clouds will change the snow surface and increase the hazard, particularly in steep or rocky terrain. 

Avalanche problems

  • Wind Slabs

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

    Continued wind transport was observed yesterday in the alpine terrain of the Greys River and Teton zones. These wind slabs are becoming less sensitive to the weight of a skier or rider, but some are sitting atop weak snow surfaces (facets and/or crusts) and remain touchy.  Recognize that wind-loading also adds stress to the weak layers buried in the snowpack (described in Problem 2 below). Any wind slab you trigger could step down to deeper layers, producing a much larger, more dangerous avalanche. While the slabs you encounter today are less likely to be large, they may produce slides large enough to knock you off your feet and send you downslope. Look for evidence of wind drifting such as dune-like drifts and ripples on the snow surface. Cracks shooting out from your skis or board are a sure sign that you've found a sensitive wind drift. 

    ADDITIONAL DISCUSSIONDirect sunshine on fresh snow is a recipe for loose snow avalanches. Variable cloud cover and winds blowing out of the SE will both help to keep the snow surface cool, but the intense March sunshine will quickly melt the snow when it breaks free from the clouds. Be aware of prolonged periods of sunshine and how that is altering the snow surrounding you. Moving forward into March, you're most likely to encounter this problem on very steep, rocky slopes that directly face the sun. 

     

     

    (3/5/2023)

    Skier-triggered avalanche on Pucker Face; despite spring-like weather, things are not open season yet, particularly in steep and rocky upper-elevation features that will see ever-increasing sunshine.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely
    Size
    1.5–2.5

    As we move away from the incremental loading events that brought improved skiing and riding conditions to our area, we focus our attention on the persistent weak layers that are buried in the snowpack. The primary culprit remains the Feb 18th facet+crust layer now buried 2-3’ below a firm, cohesive slab. Recent avalanche activity on this layer is expected to gradually decrease over time, however active weather throughout the week means we need to continue looking for this layer and assessing its activity of it on our slope of choice. It is worth carefully reading any recent observations over the past week in areas you frequent and grasp any trend with activity. 

    This combination is found on the southern half of the compass at the middle and upper elevations. Lower elevations contain this same combination, as well as just generally weak snow on sheltered aspects.

    (3/5/2023)

    This large and deep avalanche was observed on the apron of Mt. Moran following the last avalanche cycle. 

Avalanche Discussion

Wait For It

I usually think of March as the time to break out the ol' Hawaiin cutoff shirt, and my mind turns to the joys of wearing flip-flops. But as we step later into this month, we sit yet again in the crosshairs of an atmospheric river event arriving late this week.  Significant weather patterns are still en route and without much reprieve. Last season, a relatively dry and locked-in mid-winter snowpack got some large late-season large storms. This season's pack is a different beast and will pan out in a variety of ways depending on the weather we see in the near future. This cake has layers and will get even more, and some may be mayonnaise instead of frosting. It's worth testing the waters and giving it time before taking a big bite. Temperatures will warm a bit more each day throughout the remainder of the week and as additional water is headed our way. In the long term, warm temperatures and more water will eventually help to increase the stability of the snowpack. However, this process takes time and isn't always pretty. I expect the snowpack this year to behave unpredictably through this transitional period.

If you're out in the backcountry today and after our next large storm on the weekend, be aware that you are encountering a snowpack that is in the throes of change. Rapid changes are rarely pretty, and they often produce difficult-to-predict conditions. If we are lucky, shifts in weather patterns and entering into a more typical diurnal-spring flow will give our snowpack some time to heal the weak layers of snow buried within it. But don't expect that to happen in a day. Keep those layers of weak snow in mind as you travel and spend time thinking about the consequences of being caught in a slide in the terrain you are in.

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