Terrifying... Destructive… Mesmerizing … Tornadoes are among Mother Nature's most devastating storms. Those who fall in its path usually take cover or run … But there are those who track and chase these beasts for sport. Eccentric, wild and just plain crazy … Meet the Twister Chasers. Peggy Willenberg and Melanie Metz have been dubbed the Twister Sisters. For two months out of every year, they put their lives on hold to chase tornados across the American Midwest. These two track tornado-producing storms through Kansas, Oklahoma and Texas. In May 2004, they were first on the scene after a tornado hit a rural community near Hallam, Nebraska. While Melanie called 911, Peggy helped pull three teenagers from a collapsed house. We also meet Roger Hill, a veteran storm chaser who holds the Guinness World record for seeing the most tornadoes in a single season. Every spring, his tour service Silver Lining Tours delivers paying customers to the doorstep of Mother Nature's most powerful and unpredictable storms. Roger's passion for severe weather often forces him to the push the boundaries of safety. We'll watch him brave an intense hailstorm, challenge dangerous tornadic winds and dodge imminent lightening strikes. Scientists and researchers - a separate breed of Twister Chasers who pursue tornadoes for data are interviewed. Driving trucks affixed with weather radars, they get as close as they can to devastating twisters. Their goal: To unlock the mysteries of how twisters are formed and ultimately save lives by increasing tornado warning time. Follow along for a wild ride from the perspective of tornado chasers as they criss-cross the American Midwest hunting Mother Nature's most violent and unpredictable storms. From the point of view of amateurs, professional guides, and scientists you'll see why chasers become obsessed with the oddly magnificent storms that plague "Tornado Alley". It is heart-racing and unbelievable footage of twisters up close, a