Bulletin d’avalanche

Soldier & Wood River Valley Mtns

Sawtooth Avalanche Center
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Danger d’avalanche

Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
Périmé — ce bulletin a expiré 2 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Natural and human-triggered wet avalanches are possible as warm sunshine melts snow at the surface. These often initiate below cornices, cliffs, and rock bands on very steep, wind-sheltered slopes that face the sun. Snowballs rolling downslope indicate the snow surface is softening, and loose snow avalanches may soon follow. Be on the lookout for sensitive pockets of wind-blown snow in terrain exposed to the wind. Cracks shooting out from your skis or machine are a clear sign of an unstable slab.

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    Natural and human-triggered wet loose avalanches are possible as warm sunshine softens crusts and melts snow at the surface. These avalanches are most likey on very steep, rocky, wind-sheltered terrain soaking in the sun. Many will initiate near exposed rocks and cliff bands, fanning out and growing in size as they move downhill atop slick crusts. Large slopes, chutes, and couloirs can produce powerful slides that could easily catch, injure, or bury people.

    Pinwheels or herds of rollerballs on a slope indicate the snow surface is softening, and loose snow avalanches may soon follow (example). The underlying snowpack remains wet from last week's rain. Slides that gouge deeper into wet snow or flank out as wet slabs will be much larger and more destructive (photo at right/below). Don't underestimate the power of wet avalanches. Be aware of the terrain above you and where an avalanche could carry you.

    (4/6/2024) Debris from a large wet slab that released in Basset Gulch near Baldy. This slide failed on a NNE aspect at 7,000', likely sometime on Thursday or Friday.

Avalanche Discussion

Wet SnowToday's unimpeded spring sunshine will overcome crusts on the snow surface, increasing the likelihood of wet snow avalanches. Shedding of our most recent snowfall began with windows of sunshine over the weekend (photo) and accelerated with a bluebird day on Monday (Boulders, Pole Ck, Sawtooths). Cloud cover and a cool breeze helped mute wet avalanche activity yesterday until the late afternoon.

Over the last few days, the gradual and piecemeal nature of wet activity has cleaned many slopes of their loose, dry snow at the surface either by avalanching or baking it into the underlying crust. Today, wet avalanches are most likely on slopes where this dry snow has eluded the heat. One such location is mostly shaded N-facing slopes with large rock formations. Despite the overall cooler North aspect, the East and West facing rock walls above you are basking in the sun. Snow that peels from the rocks can cause avalanches on the slopes below (Smokys, Sawtooths). 

Most of the wet avalanche activity we've seen has involved snowfall from the past week, running fast and far on slick crusts. Below the crust, the snowpack remains wet from last week's rain. The chance for deeper wet avalanches that gouge into this wet snow will increase as temperatures climb into the afternoon. Take advantage of this morning's strong crusts, and be prepared to head to colder snow or pack it in early if conditions deteriorate. 

Dry SnowWhile wet avalanche concerns top the problem list, there's a lot of winter to be found on shadier slopes and at upper elevations. Wind speeds kicked up yesterday in high peaks across the forecast area (photo). Wind from the W and NW preferentially moved snow to sunnier aspects that harbor variable snow surfaces and crusts. These slabs won't have time to bond before you top out your mid-morning summit. Anticipate touchy slabs just below ridges that guard the entrance to steep lines. Fresh cornice growth may be touchy and can giveaway beneath your feet. Give these features a wide berth and don't linger beneath them. 

I hope you enjoy the amazing skiing and riding today has to offer. Make a plan, continually assess the conditions, and challenge your expectations. Flexibility is the key to success. If it doesn't feel right, it's not the right time. Give yourself options, and don't overcommit; you can always return another day. 

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