Lawinenlagebericht

East Slopes North

Northwest Avalanche Center
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Lawinengefahr

Mon
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 6 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

A bump in wind speeds may create shallow, reactive wind slabs near and above treeline. Steer around freshly loaded features while on steep slopes. Expect more dangerous avalanche conditions in the mountains near and east of Mazama where significant storm snow from last weak may rest over weak snow near the ground.

Lawinenprobleme

  • Wind Slabs

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

     Winds may create fresh, shallow slabs near and above treeline in exposed locations. Look for snow surface texture that indicates recent slab development, such as rippled and wavy surfaces. Check for signs that you could trigger an avalanche such as shooting cracks and feeling for punchy, or hollow sounding drifts. Steer around the edge of cross loaded gullies, unsupported roll-overs, and other drifted features on steep slopes. These are unlikely to be large, but assess their thickness and size as you travel. 

    Cornices may be large from the long storm cycle last week. Give them a wide berth and make sure to keep your distance by staying off of, and out from underneath these overhead hazards.  

    Textured snow surfaces and blowing snow are great clues that wind slabs may exist on the slope below.

Avalanche Discussion

You can find a big difference in the snow and avalanche conditions from west to east in the zone. Near Washington Pass and as far east as Delancey Ridge, the snowpack is deep, strong and avalanche concerns are limited to recent snow and wind events. However, in the eastern part of the zone, you may be able to trigger a dangerous persistent slab avalanche in old snow. An observer near Aspen Lake reported a triggered avalanche on older weak layers of snow underlying the recent storm snow, whumping collapses, and propagating test results. In areas like the Winthrop foothills, the Twisp River and Lost River drainages, and areas east of Mazama the snowpack may be shallow and weak. Here, you may encounter similar conditions to those in the Wenatchee Mountains, where we've issued a Special Avalanche Bulletin. If you're venturing into these eastern mountains, expect a weaker more dangerous snowpack, use extra caution near avalanche terrain, and be prepared to make your own snowpack assessments. 

On the 8th observers near the hairpin on Hwy 20 found surface hoar (6-8mm) resting on crust, and they found it buried under a few inches of fresh snow in Cutthroat Drainage on Saturday. While not a problem at the moment, this layer is worth checking for with quick hand pits as you move through terrain. With more storms on tap for early next week, now is a good time to check up on your favorite stash, to see if it's there or not.

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources. Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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