Significant rainfall from storms caused flash flooding in parts of Montgomery County, Maryland, located north of Washington, D.C., on Saturday, trapping many in buildings and cars.

The National Weather Service urged people to avoid travel if a flash flood warning was in place for their area.

Arlington and the immediate D.C. area is now under a Flood Watch. The watch was issued shortly before 5 p.m., amid developing storms in the area, and will remain in effect until 10 p.m. More, below, from the National Weather Service.

The National Weather Service released an updated flash flood warning at 6:15 a.m. on Thursday in effect until 9 a.m. The warning is for Clay, Jackson, Carroll, Lafayette and Ray counties.

We are going Weather Alert for today, tonight, and Monday morning due to a increasing concern for flooding & flash flooding. A Flood & Flash Flood Watch are in

St. Louis tackles summer weather extremes with flash floods and intense heatwave warnings from the National Weather Service.

Silver Spring and Great Falls were particularly hard hit after up to 5 to 5.5 inches of rain in less than two hours.

Severe flash flooding across the tri-state area on Monday caused major subway delays and road closures across the Big Apple and pushed New Jersey to declare a state of emergency. All five boroughs and Nassau County were under a flash flood warning through midnight, according to the National Weather Service.