Avalanche forecast

Soldier & Wood River Valley Mtns

Sawtooth Avalanche Center
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Avalanche danger

Tue
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Out of date — this forecast expired 6 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Dangerous avalanche conditions exist. Triggering a large avalanche is likely on many steep slopes. Skiers and riders should continue to choose low-angle terrain that isn't threatened by steeper slopes above. There have been many human-triggered avalanches in the past week. Most of these were triggered remotely—from below, above, and to the sides of steeper slopes.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    2

    The storm early last week added more load to our well-established persistent weak layer that is now buried around 1-2 feet deep in this zone. The highest concentration of avalanches occurred in the western portion of this zone (see observation from the Soldiers) where more snow fell, but natural slides were also observed in the Wood River Valley, in Bassett Gulch on the backside of Baldy, and in the mountains near Dollarhide Summit. In the mountains near the Wood River Valley, the greatest likelihood of triggering an avalanche exists on wind-affected slopes where a thicker slab overlies the fragile weak layer. In areas where the snowpack is a bit deeper, particularly in the western portion of this zone—including the Soldiers and Dollarhide areas—the instability is widespread, and even wind-sheltered slopes remain dangerous.

    Yesterday, an experienced observer north of this zone remotely triggered a large avalanche that failed on a steeper slope adjacent to where he was skiing. He reported hearing wood breaking as the avalanche descended the slope. I was in the Gladiator Creek drainage yesterday, investigating a large natural avalanche (photo at right) that appeared to have released within the past two days. You can watch a video describing what I found and why it is important here: Gladiator Creek Avalanche. The snowpack in both of these areas is similar to the snowpack found in this zone.

    There are two key factors that point to this instability being especially long-lasting and unpredictable: 1) the buried weak layer is especially bad, and 2) this weak layer has been very slowly loaded over the past three weeks. Recent natural and human-triggered avalanches confirm this fact. We urge backcountry skiers and riders to continue to choose low angle slopes and to pay extra attention to the terrain they're "connected" to. Remotely triggering an avalanche from below, above, and to the sides of steep slopes remains a very real possibility.

    (1/10/2021) Bed surface and debris of large natural avalanche in upper Gladiator Creek

Avalanche Discussion

I understand your frustration when you check the forecast every morning and the avalanche danger remains elevated. I would love to be able to tell you that everything is safer today. But, my job isn't to tell you what you want to hear, it is to accurately describe the conditions in the backcountry. The snowpack varies across our area, but the basics are the same everywhere. Weak, faceted snow is buried beneath a 1-3' thick slab.

Even as the days pass since the storm last week we continue to see obvious signs of instability relating to this weak snow. Each day, observers report widespread cracking and collapsing of the snowpack, even on heavily traveled skin tracks. More importantly, observations of both natural and human-triggered avalanches continue to roll in. Our snowpack is speaking to us plainly and cleary. Our job as riders and skiers is to listen to what is being said. 

We deal with dangerous avalanche conditions by operating with wide safety margins. Stay alert to the terrain that you are traveling through and that you are exposed to from above. Today is not significantly different than yesterday and we need to continue to make conservative decisions in the backcountry in order to ensure our safe return home at the end of the day. 

Have a look at the Weekend Update that I published on Friday to catch up on more of what happened this past week. 

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