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

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.

People in the warning area are urged to seek immediate shelter inside a sturdy building and to stay away from windows in case a tornado touches down.

Earlier Wednesday, a tornado warning in New Castle County, Delaware, expired at around 9:15 p.m. A severe thunderstorm watch was in effect across much of the Philadelphia region for Wednesday evening.

Residents in parts of New Jersey and Philadelphia shared photos of yellow sky, as tornado and thunderstorm warnings were in effect. What does it mean?

A NEXT Weather Alert is in effect due to the heat, but also because of the threat of storms Tuesday afternoon in the Philadelphia region.

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PHILADELPHIA (WPVI) -- Flood warnings continue in some areas Thursday after another round of severe weather moved through the region on Wednesday night, triggering heavy rain and flash flooding. Some ...

Severe weather moved through the Philadelphia region during Tuesday’s evening commute, bringing powerful wind and rain, and more on the way for Wednesday.