Lawinenlagebericht

Southeast Mountains

Crested Butte Avalanche Center
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Lawinengefahr

Mon
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

New snow amounts in the SE Mountains are minimal, but the avalanche danger is slowly increasing and will require you to adjust your travel habits from last week, to now identify the specific terrain features that have heightened avalanche conditions. Those terrain features of concern can exist at upper elevations where small wind slabs have formed, or at lower elevations where the new snow is adding volume for loose snow avalanches. Be aware that the cold temperatures may further rush your decision-making. 

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–1.5

    Previous northwesterly winds had redistributed much of the snow on Saturday, forming a few small wind slabs on lee terrain features. Now on Sunday wind speeds are generally light from the southwest. Alpine wind gusts will still be strong enough to transport some snow today and form small wind slabs in new areas. Where these slabs form over a previously weak snowpack, the resulting avalanches could propagate wider than expected, and further entrain available loose snow becoming larger in size. 

    This slab avalanche was human-triggered on Saturday in the NW Mountain forecast area. It didn't run far, but it propagated widely on the old weak snowpack. 

  • Loose Dry

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–1.5

    Accumulating snow is adding volume to the loose snow avalanche problem that we have been dealing with for the last week. In many areas, these sluffs are small and relatively easy to manage. In some areas, these sluffs can entrain enough volume to become large and difficult to manage. This avalanche problem will be the largest on northerly facing terrain, primarily below 11,500ft where the sluffs can entrain the entire weak snowpack. In extreme terrain, these sluffs may further run naturally. You can manage the problem by riding off the fall line or pulling out of the way to let your sluffs go past you. You can avoid the problem by riding on lower slope angles less than about 35 degrees. 

    Dry Loose avalanches start from a point, before growing in size. Don't be the tree and move to the side. In sustained steep terrain, this problem may grow large and difficult to manage. 

    Photo: Zach Guy

Avalanche Discussion

Dry loose avalanches and a few wind slabs, what is going on? These are some abnormal conditions for the Crested Butte area. Perhaps, not for the worse at the moment. New snow is accumulating and there is some excellent riding to be had. The lack of a notable persistent slab avalanche problem will have some people riding in steep terrain where they typically wouldn't be this time of year. If you are riding in proper avalanche terrain, don't be surprised if you encounter avalanche problems that may become more difficult to manage than expected. Sluffs are not an avalanche problem that we typically manage, because the typical persistent slab avalanche problem regularly keeps us out of that steep terrain this time of year. In some areas, those sluffs had already become notable and difficult to manage, before the accumulating new snow added additional volume to this avalanche problem.

We will eventually cross a line into a notable and widespread slab avalanche problem. New snow is accumulating onto a well-documented and very weak snowpack. The cold temperatures and relatively slowly accumulating snow is allowing us to stay on the better side of the line for now. The two main things that may first push us over that line would be high precipitation rates or elevated winds transporting snow. The current weather forecast is not calling for those high precipitation rates today, or sustained winds strong enough to transport snow. Those wind speeds will be something we need to keep a close eye on as we head into Monday and Tuesday and they will likely drive the avalanche danger ahead of the next storm on Wednesday. 

Storm totals since Friday vary widely, and with widely varying storm totals we can have a widely varying avalanche danger across the forecast area. In the northwest mountains as of 5am, those storm totals vary from a few inches to well over a foot in some areas. Schofield Pass and Irwin are measuring .3 to .4 SWE gains. In the SE Mountains, the new snow accumulations are meager as of 5am, with just a trace to a couple of inches. 

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