Dr. Jo Thornton-Harding (Helen Hunt), who as a small girl watched her father sucked to his death from her family’s storm cellar by a massive tornado. Now a storm chaser, a scientist who risks her life to study the dark side of nature by taking her data-transmitting instruments directly into the path of a deadly storm, Jo chases the largest tornado to ever strike Oklahoma as her marriage implodes and rival scientists will stop at nothing to steal her breakthrough.
directed by Jan de Bont, 1996