Tornadoes generate winds over 300 miles per hour and cause an average of 60 deaths and millions of dollars in damage every year in the United States alone. This episode follows storm chasers into the field as they track supercells across the American heartland, and crosses the Atlantic to examine twisters that have struck the British Isles and the French countryside, along with outbreaks in Southeast Asia. Meteorologists and researchers explain how tornadoes form, why some regions see far more of them than others, and why scientists are watching whether warming global temperatures are widening the areas twisters can reach. The film also tracks the technology behind modern warning systems, from radar advances to the broadcast networks that now give residents crucial extra minutes to reach shelter before a funnel touches down. Real chase footage and interviews with scientists in Europe and the U.S. anchor the story, building a picture of a hazard that remains difficult to predict even as detection keeps improving.