Twister is a story about violent tornadoes and storm chasers. Bill and Jo Harding are storm chasers who have developed a state-of-the-art device to record high intensity tornadoes. They are on the brink of a divorce. When a level 5 tornado arrives in their town, they must set aside their differences and team up again to measure the tornado. Joining them are Dustin, Mellisa and Meg.