Sky Diary 24 May 2013 Colorado-Nebraska storm - 2013-05-24 at 18-15-20

Caption: I loved the structure of this cloud base. Photo by Chris Kridler, ChrisKridler.com, SkyDiary.com
Aperture: ƒ/7.1
Shutter Speed: 1/200
Date: 5/24/13 6:15:20 PM CDT