Severe storms caused flash flooding across New York City on Monday, submerging subway stations and stranding commuters during evening rush hour. Rainfall rates reached 3.81 inches per hour in Manhattan, the highest since Hurricane Ida in 2021. The flooding prompted emergency water rescues and forced major subway line closures throughout the city. New Jersey declared a state of emergency in hardest-hit areas as floodwaters overwhelmed infrastructure. Officials reported this was one of the most extreme rainfall events in recent NYC history.