Bollettino valanghe

East Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Tue
Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Update- 07:30AM January 11: Keep an eye out for fresh, shallow wind slabs near and above treeline and monitor sluffing within the new snow. Check for signs of instability such as shooting cracks as you gain elevation. Avalanche danger will rise into the evening with increasing wind and snow.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1

    A few inches of new snow and fresh westerly winds will create shallow slabs near and above treeline in exposed locations (though wind speeds have been less than forecast so far). These may be thicker and wider the higher you go. 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 snow or hollow-sounding drifts. Steer around the edge of cross-loaded gullies, unsupported roll-overs, and other drifted features on steep slopes. Observers reported patchy crops of surface hoar on the 8th. Fresh slabs may be more reactive if they form over the top of these weak crystals. 

    Watch for sluffing with the new snow. Give cornices 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

Time and fairly quiet weather have helped the snowpack to settle over the weekend, and people stepped out safely into bigger terrain. Expect avalanche conditions to begin ramping up again on Monday. By Tuesday, we may be looking at High danger with a whopping dump of snow, strong winds, and temperature fluctuations.

Near Washington Pass, the snowpack is deep, strong and avalanche concerns are limited to recent snow and wind events. However, in the eastern part of the zone the snowpack is more shallow. Here, persistent weak layers may be found near the ground. Last week, an observer near Aspen Lake reported an avalanche on old, weak layers beneath the recent storm snow, whumping collapses, and propagating test results. In areas like the Winthrop foothills, the lower Twisp River, the Lost River drainages, and areas east of Mazama the snowpack may be shallow and weak. 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 in these locations.

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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