A tornado warning, replete with threatening funnel clouds, made IndyCar drivers' weekend at Iowa Speedway extra memorable.

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

Listen to the sirens going off at the track.

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

Visible funnel clouds near the track ensure IndyCar drivers will not be playing ‘Twister’ in practice today at the Iowa ...

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

Drivers and teams captured photos and videos of the storm making its way through the area. IndyCar reporters said tornado ...

Heavy rain caused flooding issues in Ames and rotation was observed in clouds around the Iowa Speedway in Newton as the area ...

Here's what you need to know about IndyCar Race Weekend at the Iowa Speedway, including the schedule of events.

Friday’s IndyCar Series action at Iowa Speedway was cancelled after a massive storm system moved into the area.

IndyCar sold about 14,000 tickets for the July 12-13 doubleheader at Iowa Speedway. Will it fall off the IndyCar schedule for a second time?

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