Amazed by this video? The photographs are even more incredible! Help send the photographer to South America through National Geographic’s Exceptional Experiences contest by casting your vote: www.nationalgeographic.com Voting is easy - you can even sign in through your Facebook account! Chad Cowan and best-selling author of The Stormchasers Jenna Blum captured this absolutely INSANE storm structure from South Dakota on July 23, 2010! Earlier in its life-span, as the storm was over the town of Vivian, SD, it dropped a RECORD-BREAKING hail stone — this monster was a whooping 8 INCHES IN DIAMETER and weighed just under TWO POUNDS!!! Check out Chad's website for more (prints available)! www.chasethestorms.com Click here to order your copy of The Stormchasers - www.jennablum.com You can also catch LIVE storm chasing at www.TornadoVideos.net !