Our story focuses on the efforts of a team of scientists at the University of Oklahoma to use, for the first time, high resolution Doppler radar data to forecast severe thunderstorms in real time. Using the a super computing grid at the National Center for Supercomputing Applications, the team believes it can achieve an unprecedented degree of accuracy and lead time. But our story goes far beyond the computer lab. We'll accompany tornado chasers as they race across the state to get in position to witness the storms themselves. There is an amazing tension within the story--between the chase teams, with their sixth sense and experience, and the enormous calculations of made by the computer and between the latest theories of tornado formation and the incredible complexity of these natural events.Special DVD features include: materials and activities for educators; a link to the NOVA Web site; closed captions; and described video for the visually impaired.