Mammatus Clouds Over Rio Negro, Argentina

February 17, 2015


Photographer: Carlos Di Nallo
Summary Authors: Carlos Di Nallo; Jim Foster

The photo above showing a lumpy, straw-colored sky was taken a little after sunset over above Las Grutas, Rio Negro, Argentina. When back-lit by the setting Sun, as was the case on this mid-summer day, the pendulous appearance of these clouds can be especially captivating. Mammatus clouds form when cold air downdrafts push against a storm cloud's base. They're sometimes seen on the underside of cumulonimbus anvils. Photo taken on January 31, 2015.

Photo Details: Camera: Canon EOS REBEL T3i; Lens: EF-S18-55mm f/3.5-5.6 IS II; Focal Length: 55mm; Aperture: ƒ/13.0; Exposure Time: 0.0063 s (1/160); ISO equiv: 400; Software: Adobe Photoshop CC 2014 (Windows).