A plucky meteorology heroine; a male rival with no shortage of hubris; and some very, very big storms: that's the basic formula behind the new disaster action movie Twisters, which follows storm chasers around Oklahoma amid a tornado outbreak.It's a standalone sequel to the 1996 film Twister, a box-office hit in its day which also spurred a lot of real-life research into severe storms.We've since learned a lot about how tornadoes behave, and the technology of storm chasing has improved dramatically. But behind these summer blockbusters is a mystery that scientists are still trying to solve: why do tornadoes form at all?For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org.Email us at [email protected] more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy