Transcript for Weather system unleashes heavy rains over the last 24 hours
We are also tracking flash flood watches and strong storms moving into the northeast tonight. All the way from Oklahoma. The system already unleashing heavy rains over the last 24 hours, downing trees near ellendale, North Carolina. Flash flooding leaves cars under water in St. Louis. And meteorologist rob Marciano is tracking this again for us tonight. Hey, rob. Reporter: Hi, David. Severe storms are popping in this hot and humid air mass ahead of that cold front that will finally bring some relief to this oppressive heat. On the radar, you see it in North Carolina, Virginia, trees down with severe storms there, another batch coming through that area. Maryland, eastern Pennsylvania, as well. The wave back over the Mississippi. It's what brought the flash flood into Kansas. That kind of drifts to the east. It will have enough dynamics to drag the front south of D.C. During the day tomorrow, but not even into the mid south. So, it is August, more storms along that front and south of it tomorrow, but here in the northeast, thankfully, it will be quieter and cooler. David?
This transcript has been automatically generated and may not be 100% accurate.