Asperitas Clouds Over Evia Island, Greece
June 25, 2018
Photographer: Dimitris Malliaris
Summary Authors: Dimitris Malliaris; Jim Foster
Shown above are asperitas clouds looming over Evia Island, Greece. This was the first time I'd ever seen these eye-catching clouds. They were visible for only a few minutes before quickly disappearing. Previously classified as asperatus clouds, they form under similar atmospheric conditions that produce mammatus clouds; namely, air is cooled by the sublimation of ice crystals which then pushes through an existing cloud base. Strong wind shear then shapes the clouds into wave-like structures known as undulatus. Photo taken on May 6, 2018.
Photo Details: Canon EOS 6D camera; Canon 24-105mm f/4 L IS USM lens; 40mm focal length; ƒ/8 aperture; 1/640 sec. exposure time; ISO100; Adobe Photoshop CS6 (Windows).