In parts of Chicago, flash flood alerts rang Tuesday, warning of dangerous conditions as cars were stranded and submerged on highways and water rescues were conducted, but how much rain actually fell across the region and how fast did it all happen?

Forecasters warned more rain and flash flood risk is expected on July 15 after storms flooded out roads the day before.

Intense rain swamped the East Coast Monday, setting off dangerous flash flooding from Virginia to New York that killed at least two people and prompted dozens of rescues as water overwhelmed roads and subways.