India, July 15 -- Severe flash flooding struck New York City, Westchester County, Staten Island, and Rockland County, Bergen, Essex, Hudson, Passaic, Union, Fairfield, Sullivan, Dutchess, Ulster, and Warren on Monday. The warning, triggered by thunderstorms dumping 3-3.5 inches of rain, with an additional 0.5-1 inch expected, sparked chaos across the state.

The National Weather Service (NWS) in Upton issued Flash Flood Warnings for these areas until 9:45 PM EDT, with videos showing inundated streets and transit chaos.

The FEMA Flood Map Service Center provides flood risk data for New York, identifying 100-year (high-risk, zones VE, AE, A) and 500-year (moderate-risk, zone X) floodplains. Areas like Staten Island, Westchester, and Rockla...