Several subway lines were impacted by flooding. A photo from the 28th Street station in Manhattan showed water gushing from a drain and soaking the platform. Water was pooling on the platform at 34th Street-Penn Station, one of the city's busiest subway stops, as riders carefully maneuvered around.

Forecasters warned more rain and flash flood risk is expected on July 15 after storms flooded out roads the day before.

Heavy rain swept across parts of the Northeast on Monday night, inundating sections of New York and New Jersey with flash flooding that stranded vehicles in roadways and closed subway lines.