PLAINFIELD, NJ — The National Weather Service has declared a flash flood warning for Union County Monday until 7:45 p.m. 

A severe thunderstorm warning was also put into effect until 5:45 p.m.

Flash flooding was expected to begin quickly, according to the service, due to the heavy rain, particularly in areas where heavy rainfall has already occurred.

Additional rainfall amounts of up to two inches are possible, it said.