Clouds Exhibiting Kelvin-Helmholtz Waves (IMAGE) NASA/Goddard Space Flight Center Caption Kelvin-Helmholtz waves, with their classic surfer's wave shape, are found in nature wherever two fluids meet, such as in these clouds. Credit Danny Ratcliffe Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.