Sky Diary 31 May 2013 El Reno, Oklahoma, tornado - 2013-05-31 at 18-15-37

Caption: Cropped and contrast-enhanced: There's a big tornado in there. As the storm approached Route 81 a few miles to my north, several storm chasers were nearly trapped by the rapidly expanding and shifting tornado. As I write this, it is unclear exactly where the three storm chasers who died were. Photo by Chris Kridler, SkyDiary.com, ChrisKridler.com
Aperture: ƒ/4.5
Shutter Speed: 1/80
Date: 5/31/13 6:15:37 PM CDT

Sky Diary: 31 May 2013 El Reno, Oklahoma, tornado and storm structure