Avalanche forecast

Galena Summit & Eastern Mtns

Sawtooth Avalanche Center
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Avalanche danger

Thu
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

Watch for and avoid fresh wind drifts and slabs. You will find more, and larger, drifts and slabs as you climb from middle to upper elevations. At lower elevations, steer clear of steep slopes if you are sinking into a wet, mushy snowpack. Although very unlikely, you may be able to trigger thick slab avalanches in steep, upper elevation terrain that faces away from the sun. 

We will issue our last daily Avalanche Forecast of the season this Sunday, April 5th. We will issue General Avalanche Information updates through late April or early May.  

Avalanche problems

  • Wind Slabs

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

    You could find wind slabs up to 2 feet thick in exposed terrain. Wind slabs are largest and most widespread at upper elevations. Recent cornice growth, pillows, and dunes are all clues that wind was at work moving snow. Look for shooting cracks as evidence of fresh wind slabs and a nudge to move to softer snow on more sheltered slopes. These slabs commonly form beneath ridgelines, on the sides of cross-loaded gullies, and lower in cirques below large cliff bands, chutes, and couloirs.

Avalanche Discussion

Just when we thought winter had punched its timecard and clocked out - April Fools - it's back! With the return of snowfall, it's worth turning our brains back into winter mode and out of the simplified spring-diurnal mindset. Keep your head on a swivel for changing conditions if you're out enjoying the cold new snow, especially in areas where you find more than 6" of fresh snow. Spring storms are notoriously spotty in character, with large amounts of variability in the timing and quantity of snowfall across the landscape. Additionally, convective storms could produce graupel or other snow crystal types that form sensitive mid-storm interfaces. These interfaces make great failure layers for even thin wind slabs that quickly form above them.

Conveniently, the recent warm weather has solidified much of the snowpack below this new snowfall, but we can't totally rule out triggering a large, thick persistent slab avalanche on NW-N-NE-E aspects above ~9000'.  Many of these slopes still harbor weak layers (sugary facets, surface hoar, and crust + facet combinations) that remained dry during the March heat waves. On steep slopes where new snow is accumulating on firm, hard ice or wind-hammered surfaces, loose snow avalanches (sluffs) could release naturally or be easy to trigger and run faster and further than expected. At lower elevations near or below the rain-snow line, wet avalanches are still in the mix, and avoiding steep slopes where you find unsupportable wet snow is a great way to play it safe. Given the variety of conditions you may experience in the mountains today, be ready to pull the plug and switch to a more conservative plan B if you see obvious signs of instability or feel the hairs on the back of your neck stand up.

Regions covered