Chasing Tornadoes: The Life of a Storm Chaser

While out with professional storm chaser Reed Timmer, ABC News' Matt Gutman captured this photo of a fierce tornado that cropped up near Canton, Okla., on Tuesday, May 24. Gutman reported it was one of three tornadoes he saw that day while out with Timmer and his team as the storms headed east. Towns across the Midwest braced for a second round of violent weather, including the city of Joplin, Mo., which was ravaged by an EF-5 tornado on Sunday that killed over 120 people. It is the worst death toll on record for a single tornado. Tune into "Nightline" tonight at 11:35 p.m. ET/PT to get the latest from "Nightline" anchor Terry Moran, who is on the ground in Joplin. (Matt Gutman/ABC News)