Sky Diary 26 May 2013 Nebraska supercell - 2013-05-26 at 21-50-45

Caption: More amazing mammatus! Photo by Chris Kridler, ChrisKridler.com, SkyDiary.com
Aperture: ƒ/5
Shutter Speed: 16.9s
Date: 5/26/13 9:50:45 PM CDT