Sky Diary 24 May 2013 Colorado-Nebraska storm - 2013-05-24 at 19-30-54

Caption: Brad, Dayna and Greg in front of another swirl. Photo by Chris Kridler, ChrisKridler.com, SkyDiary.com
Aperture: ƒ/8
Shutter Speed: 1/250
Date: 5/24/13 7:30:54 PM CDT