Boletín de aludes

Stevens Pass

Northwest Avalanche Center
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Peligro de aludes

Sun
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 4 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Expect chances to trigger small windslabs at higher elevations with an inch or two of new snow and continued breezy conditions. Gather information on how wind drifted snow reacts before comitting to steep slopes. Near and below treeline you are much less likely to trigger any avalanches. 

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5

    An inch or two of new snow may add to some of the recently formed slabs at the highest elevations of the zone. Any triggered slabs are likely to be shallow, but theres also a chance that avalanches break about a foot deeper, on weak snow overlying the slick MLK crust. Be especially cautious near ridges, on open steep slopes, and convex rollers in the alpine that could serve as likely trigger points. You can identify slabs through textured surfaces, and stiffer snow. With these, look for signs of instability as you travel such as long shooting cracks, and consider using small test slopes to gain more information on how the snow is reacting. If you observe signs of unstable snow, steer around steeper or more consequential features.

    (1/27/2023) Whitepine Cirque and some wind drifting. Photo: Matt Primomo

Avalanche Discussion

Some light, low density snow should fall on Saturday. I found about 3" of new snow in the Skyline vicinity on Friday, and it was generally bonding well to old, moist surfaces. A few places of fresh drifting did exhibit some minor cracking on test slopes. I found an average of about a foot on top of the slick MLK crust, which was translucent ice in most places observed. Small faceted grains just above this crust were the weak layer in tests, and tests showed some potential to propagate. On Wednesday we received a report of a ski triggered D1.5 slab that ran on this crust. 

Further down in the snowpack, you might be able to find a surface hoar layer from January 4th. Avalanches on this layer are not expected, though we're still tracking it.  It is often found about 1.5-2 feet below the surface and between 5,800-6,500ft in wind sheltered terrain on the east side of the zone. On the 19th, skiers triggered a large avalanche 1-2 feet deep on Jim Hill on a NE aspect at 6,200ft. In the neighboring East Central zone, there were multiple observations, including large natural avalanches running on this layer during the middle of January.

Regiones cubiertas