As 27 million Americans are under severe thunderstorm and flood watch on Wednesday, a line of strong storms packing intense rainfall is threatening the Mid-Atlantic.

After severe weather and heavy rain on Thursday, more storms are headed for Iowa on Friday afternoon prompting a tornado watch and flood watch.

With storms back in the forecast, it's important to clear up the difference between a tornado watch and a tornado warning.

A dramatic shelf cloud loomed over the Washington DC area as severe storms brought flash flood and thunderstorm warnings. The striking weather phenome

Cleanup efforts are underway after powerful storms swept through the D.C. region on Wednesday night, prompting a tornado warning in the District and Flash Flood alerts from Northern Virginia to Maryland.

More than 150 died when a twister tore through Joplin in 2011, making it the deadliest tornado in the last seven decades.

Video shows the phenomenon floating over the city of Bowie as storms and flooding hit areas across the Northeast US.

Dark clouds and slow-moving thunderstorms rolled into the western part of the D.C. metro area, prompting a tornado warning and a barrage of severe thunderstorm warnings Wednesday afternoon.

An updated tornado warning was issued by the National Weather Service on Tuesday at 5:52 p.m. in effect until 6:30 p.m. for Bucks, Montgomery and Philadelphia counties.