Tornadoes rank among the most violent storms on the planet, capable of winds over 300 mph, and this film gathers ground-level footage and expert interviews to explain how they form and why some outbreaks turn catastrophic. Meteorologists and storm chasers walk through the physics of supercell thunderstorms, the wind shear that starts a funnel rotating, and the pressure differences that let a twister rip a house off its foundation. Archival news footage and firsthand video from chasers and residents show funnels touching down across Tornado Alley and beyond, while the narration ties specific outbreaks to the atmospheric conditions that produced them. The film also looks at forecasting technology, from Doppler radar to storm-spotter networks, and how warning times have changed the survival odds for towns in a tornado's path. It closes on the limits of prediction: even with modern tools, meteorologists still cannot say exactly which storms will drop a tornado until one is already on the ground.