A flash flood watch is in effect until 6 a.m. for Mercer County, Central New Jersey and Eastern Pennsylvania.
Showers and thunderstorms are expected through the night, according to the National Weather Service in Mount Holly. The storms will include torrential rain, which could lead to flash flooding. Average rainfall amounts around an inch are expected, but some areas could receive more than three inches of rain.
A flash flood watch means conditions may develop that lead to flooding and a rapid rise of water to dangerous levels.