Jan De Bont directed this unforgettable thriller packed with dazzling special effects. Helen Hunt stars as Jo, a scientist who is chasing tornadoes through Oklahoma in an attempt to release an experimental instrument pack into the heart of a twister. Complications arise when Jo and her team are joined unexpectedly by the device's inventor, her estranged husband (Bill Paxton). Jami Gertz, Cary Elwes.