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During the approach of the most powerful storm in decades, university professor Dr. Jo Harding (Helen Hunt) and an underfunded team of students prepare the prototype for Dorothy, a ground-breaking tornado data-gathering device conceived by her estranged husband, Bill (Bill Paxton). When Harding tells Bill that Dorothy is ready for testing -- and that their privately funded rival Dr. Jonas Miller (Cary Elwes) has stolen the idea and built his own -- Bill rejoins the team for one last mission. Wikipedia