Heavy storms overnight Saturday into Sunday morning left cars stranded, homes flooded and streets impassable in Kentucky.
Residents felt the downpour with more than three inches of rain falling over the course of a few hours in Metro Louisville and parts of southern Indiana.
The Weather Channel's Chris Friedman said the flash flooding was triggered by a round of torrential rain.
A flash flood warning was issued for eastern Jefferson County just after 7 a.m., but expired at 10:15 a.m.
NBC station WAVE reported that the ground was already saturated from a wet start to July, leaving no place for the water to go.
Jody Duncan, a spokeswoman with the Louisville Metro Government said the water is beginning to recede but they are already preparing for another big storm expected to hit late Sunday night.
"We've seen quite a bit of flooding this year," Duncan said. "But never this amount of water in this amount of time."
Indian Hills Mayor Thomas O. Eifler told WAVE it's the worst he's ever seen it.
"I've lived in this city for 40 years," Eifler said. "Been the mayor for 20 years and I've never seen the water up this high."
No injuries were reported as of Sunday afternoon.