Lawinenlagebericht

East Slopes Central

Northwest Avalanche Center
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Lawinengefahr

Thu
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

A potent storm will bring heavy snow overnight and dangerous avalanche conditions. Avalanches will be most likely where the wind drifts thick slabs of snow and they will be possible anywhere continuous snow covers vegetation and rocks. Steer around freshly drifted pillows of snow and wind-loaded slopes steeper than 35 degrees. If you find over a foot of new snow, expect even more dangerous conditions.

Lawinenprobleme

  • Wind Slabs

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

    You can trigger wind slab avalanches immediately on the leeward sides of terrain features in stiffer slabs and pillows of snow. If you don't see actively blowing snow, stay alert to visual clues that the previous drifting occurred. You may see (or feel) 1) areas of deeper snow near shallower areas, 2) stiffer, wind-sculpted features, and 3) cracks that shoot through the snow. With the shallow snow cover, even a small avalanche could push you into rocks, stumps, or logs. You can avoid getting caught in an avalanche by sticking to slopes under 35 degrees and wind-sheltered terrain. 

    Expect very strong winds with heavy snow overnight. Blowing snow will continue through Wednesday in many areas. Wind direction will vary and could be strong enough to drift snow below treeline. Take careful note of the wind-loading directions as you move through the terrain. The cold air temperatures may make the snow very light and dry and keep instabilities from gaining strength. On very steep, wind-sheltered terrain, you may be able to trigger loos avalanches 

     

     

    (12/16/2021)

    Small cornices and drift formations indicate the primary wind direction (right to left in this photo and point towards potentially wind loaded slopes.

    Photo: Katie Warren

Avalanche Discussion

Avalanche conditions may be more dangerous in the headwaters of the Teanaway drainage and the Salmon La Sac area. The potent storm may deliver up to 2 feet of snow in the southwest corner of the zone. In places where you find less than a foot of fresh snow, you can expect conditions closer to this forecast. Expect more cold temperatures for Wednesday. Bring and wear extra layers and monitor exposed skin for cold injuries. Consider using a buff or face mask to protect your nose and mouth from wind chill. 

Many below-treeline areas still have very shallow snow cover. Access at lower elevations is challenging, and we have limited information about the snowpack at upper elevations. If you are headed out into the mountains, be prepared for long approaches on thin snow cover. Many motorized trailheads have limited snowpack, and most have yet to begin grooming operations. In addition, the recent snow may have shallowly buried rocks, stumps, creeks, or other hazards.

If you are out and about in the mountains, let us know what you find by submitting an observation.

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