Rain can spoil a day at the racetrack, but IndyCar fans were treated to much more than just a simple rain shower on Friday ...

Severe storms and a Tornado Warning halted the IndyCar practice at Iowa Speedway Friday, sending drivers and fans scrambling ...

Eyewitness captures moment in which a tornado warning interrupts IndyCar practice at Iowa Speedway in Newton. Video credit: ...

Listen to the sirens going off at the track.

After an afternoon filled with tornado sirens, lightning strikes, torrential rain and visible cloud rotation near Iowa ...