Tim Samaras’ fascination with tornados began as a kid watching “The Wizard of Oz.” And that obsession drove him to become one of America’s greatest storm chasers. Brantley Hargrove joins us to talk about how Samaras risked his life to learn all he could, the subject of Hargrove’s book “The Man Who Caught the Storm: The Life of Legendary Tornado Chaser Tim Samaras” (Simon & Schuster).