The National Weather Service in Mount Holly has issued a flash flood watch for portions of 13 counties in New Jersey, portions of northern Delaware, and southeast Pennsylvania through Friday night. Mercer, Hunterdon, Middlesex, Monmouth, Burlington, Somerset, Ocean, Gloucester, Morris, Salem, Sussex, Camden, and Warren counties could experience flash flooding between late Thursday night and Friday night.

Heavy rain is expected to start late Thursday night and continue through the day on Friday. Rainfall of one to two inches is likely, but higher amounts are possible.

A flash flood watch means there is the potential for flash flooding that can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties.

A tropical storm warning has also been issued for Atlantic, Cape May, Ocean, Monmouth, Middlesex, and Burlington counties. Heavy rain leading to flooding is possible, especially along and southeast of the Interstate 295 corridor. Tropical Storm Fay is expected to progress north over the region through Friday. According to the National Weather Service, the threat of tropical storm winds over land is very low except right along the New Jersey coast.