May 21, 2013—Two days before a tornado—with winds clocked at 190 miles per hour—tore through suburban Oklahoma City on May 20, National Geographic explorer and storm researcher Tim Samaras captured this video of a tornado forming in south-central Kansas. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and