Tornado!

Tornado! is a 1996 American made-for-television disaster film that is directed by Noel Nosseck and starring Bruce Campbell and Shannon Sturges and was aired on the Fox television network on May 7, 1996.
Plot.
Jake Thorne (Bruce Campbell) is a storm chaser whose friend and former graduate school advisor, Dr. Joe Branson (Ernie Hudson), has developed a machine that may be able to provide earlier tornado warnings. Samantha Callen (Shannon Sturges) is a government auditor who must determine whether Dr. Branson's project warrants more funding. Jake has to try to convince Samantha that the machine is worthwhile. During the process, Jake and Samantha become romantically attracted to each other, but powerful tornadoes threaten the lives of all the major characters. The film ends with Jake's father, Ephram, sacrifices himself to save his son by locking the storm cellar by nailing the door shut to make sure everyone is safe. The tornado takes Ephram, while everyone in the storm cellar starts to clean up and to look for survivors. Jake becomes upset that his father died, but Samantha tells him that he saved their lives, and that Jake must never let anything like this happen again.
Filming.
"Tornado!" was filmed primarily in Austin, Texas, including scenes at local Fox Broadcasting Company affiliate KTBC. The film runs 89 minutes, and has been released on VHS, DVD and Netflix. It is rated PG for some perilous weather sequences and mild language.