Two people were killed after flash floods struck areas of New Jersey on Monday, causing submerged cars, and flooding roadways. A state of emergency was declared in New Jersey after slow-moving thunderstorms unloaded a significant amount of rain, resulting in dangerous flash flooding across the Northeast through Monday night. According to a Facebook post from the city of Plainfield, NJ At least two people died in Plainfield, N.J., located about 20 miles southwest of New York City, after floodwaters swept away a vehicle into Cedar Brook. On Monday evening, a thunderstorm in New York City caused 2.07 inches of rain to fall in just one hour. Water gushed into subway stations, stranding some riders aboard a stalled train.