Twister (1996)

Bill and Jo Harding, advanced storm chasers on the brink of divorce, must join together to create an advanced weather alert system by putting themselves in the cross-hairs of extremely violent tornadoes. - rball4042

TV weatherman Bill Harding is trying to get his tornado-hunter wife, Jo, to sign divorce papers so he can marry his girlfriend Melissa. But Mother Nature, in the form of a series of intense storms sweeping across Oklahoma, has other plans. Soon the three have joined the team of stormchasers as they attempt to insert a revolutionary measuring device into the very heart of several extremely violent tornados. - Martin H. Booda

The year is 1969. In Oklahoma County, thunderstorms roll across an open plain, and in a remote farmhouse young Jo and her family are about to go to sleep, but her father is watching a tornado warning on TV. The TV warns that the imminent tornado may be an F5, the strongest known. Not long after the family reaches the storm cellar the huge twister hits, passing right over top of them & killing her father. 27 years later, Jo is now a storm scientist, trying to develop a tornado warning system with her soon-to-be-ex, Bill Harding. Multiple attempts fail for one reason or another, and their team sees a tremendous amount of damage & death. Then, one time, they find themselves In the damage path of a huge F5 tornado. Can they succeed in launching their test equipment, then escape the deadly storm in time? - Medic249a2

When Bill goes to have Jo sign the divorce papers so he can marry his new girl, Melissa, Jo finds a collection of record breaking tornados and Bill follows along, soon his duties shift from divorcing Jo to helping her with record breaking technology to create a better warning system. - Joe Kibler