Lawinenlagebericht

East Slopes South

Northwest Avalanche Center
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Lawinengefahr

Sat
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 3 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Temperatures will ramp up a little more on Friday, and you can expect a mostly sunny day. Wet avalanches may run on steep, sunny terrain, particularly in the warm afternoon. Move off of steep slopes if you are sinking in deeply to wet, heavy snow, and be wary of steep, rocky terrain overhead.

Lawinenprobleme

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    We haven't fully transitioned to a spring snowpack at many elevations, and temperatures have been chilly for mid-April. But a combination of calm winds, warmer temperatures, and sun on Friday may increase the potential for wet loose avalanches in steep, sunny terrain. The intense April sun only takes a little time to warm snow surfaces, particularly in areas with fresh snow. We expect most wet loose avalanche activity to be small. However, further north, the WSDOT highway crews in the Highway 20 corridor observed a few large avalanches on steep south aspects on Wednesday. These larger avalanches indicate that our snowpack hasn't adjusted to the spring weather, and wet avalanches could entrain a significant amount of snow as they travel, becoming large and dangerous. Move off steep slopes if you begin to sink into deep, wet snow or see steep rocks shedding snow in the sun. There may also be lingering glide avalanche potential on rock faces and steep, smooth slopes. So if you see a big frowning glide crack or hanging blocks of snow on rocky ledges, give yourself a wide berth around these unpredictable avalanches. 

    (4/13/2023)

    Wet loose avalanches off the steep East slopes of Wedge Mountain. 

    Photo: Matt Primomo

Avalanche Discussion

You may still find isolated pockets with lingering wind slabs in alpine terrain. Steep ridgelines, the base of cliffs, and confined alpine features above 6500ft are the most suspect slopes to trigger one of these avalanches. If you see large pillow-like drifts, shooting cracks, or the snow feels hollow beneath you, simply travel on lower-angle slopes or steer around these wind-loaded features.

After a very rainy start to the week, Tuesday brought a welcome cooling and clearing trend for much of the East South zone. Further west, the rain turned to snow and piled up in some locations, particularly near Chinook and White Pass. The Bumping Lake area may have received up to 3-4" of new snow, while there was probably only 1-2" at Ahtanum Meadows. Overnight temperatures dropped into the teens on Tuesday night, forming a thick crust on surfaces at mid and lower elevations. The recent rain and warm temperatures changed the landscape a bit, and you can expect challenging travel and lots of bare ground at lower-elevation trailheads. 

This is my last forecast for the season, so I hope you have a fun, safe spring. Thanks to the incredible backcountry community for your observations and support of the Northwest Avalanche Center. We'll see you back here in the fall.

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