Heavy rainfall on July 31, 2025, caused severe flooding across New York City and parts of the northeastern United States, including New Jersey and Washington. The intense downpours led to widespread disruption of transportation systems, with roads submerged, train services suspended, and flights delayed. New York City experienced flooding in subway tunnels, notably creating a waterfall effect in underground stations such as Grand Central Terminal. In response to the extreme flash flooding threat, states of emergency were declared in New York and New Jersey. The flooding followed a similar event two weeks earlier that had also caused significant disruptions in the region.