PHILADELPHIA (CBS) – The Philadelphia region is under a severe thunderstorm watch until 9 p.m. as the area prepares to feel the effects of Tropical Storm Elsa. The National Weather Service issued the watch just after 2 p.m.

Credit: Iowa Environmental Mesonet

The counties involved include the following Pennsylvania Counties: Berks, Bucks, Carbon, Chester, Delaware, Lehigh, Monroe, Montgomery, Northampton, and Philadelphia.

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The following New Jersey counties are also under the watch: Mercer, Middlesex, Monmouth, Morris, Somerset, Sussex, and Warren.

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The watch comes as Philadelphia, New Jersey and Delaware are bracing for impacts of Tropical Storm Elsa Thursday night into Friday.