(via) This time lapse from storm chaser Alex Schueth shows undulatus asperatus clouds rolling in spectacular fashion over Lincoln, Nebraska. The clouds’ name comes from the Latin, “roughened or agitated waves”. They’re are formed when “enough atmospheric instability, or rising air, is available to create widespread cloud cover, as well as wind shear and turbulence, which creates the wavy, rough sea-like visual effect.” Video of the same below…