This animation of imagery from NOAA’s GOES-13 satellite shows the movement of storm systems in the south central U.S. on May 19 and 20, 2013. The system generated tornado outbreaks from Oklahoma to Iowa, from the afternoon into the night. This outbreak was the first reported in Iowa since late May 2012. Toward the end of the animation is the system that generated the Moore, Oklahoma, F-4 tornado (winds between 166 and 200 mph) on May 20 around 3 p.m. CDT.
Credit: NASA/NOAA GOES Project, Dennis Chesters