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      Amazing 'surf' clouds over Lake Tahoe

      (function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = "//connect.facebook.net/en_US/all.js#xfbml=1"; fjs.parentNode.insertBefore(js, fjs); }(document, 'script', 'facebook-jssdk'));Post by Darren Springer.


      They're caused by when you have wind shear -- that is, layers of air moving in different directions. As those layers interact with clouds, you can get turbulence that causes these impressive wave-like formations to occur. (A much more in-depth physical description can be found on the Univ. of Illinois Urbana-Champaign website

      The cloud formations aren't foreign to the Pacific Northwest -- we've had a few sightings over the past few years.

      They're pretty to look at on the ground, but for pilots, they signal an area to avoid as it can be a source of severe turbulence.

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