![]() ![]() Widespread heavy rainfall occurred in a concentrated area from the New York metropolitan area to southern New York to southern Connecticut to western Massachusetts along a low-level convergence axis. Convection developed on the morning of September 29 after an upper-level trough approached from the Ohio valley and interacted with a strengthening cold front offshore in the Atlantic Ocean. A weak low-pressure area developed off the East Coast of the United States, absorbed the remains of Tropical Storm Ophelia, then stalled, dropping heavy rainfall across areas that were already under a flood watch after Ophelia had moved through the same region days earlier. Meteorological synopsis A mesoscale discussion from the Weather Prediction Center showing the expectation of flash floods across New York CityĪ moderate risk of excessive rainfall was issued by the Weather Prediction Center, and a flood watch was issued for portions of New York, Connecticut, and New Jersey. The heavy rainfall was caused by a stalled low-pressure area as showers and thunderstorms developed on September 29. A ground stop was imposed on LaGuardia Airport, where nearly 60 flights were cancelled. Metro-North Railroad service was suspended on three lines, and several boroughs and numerous streets were flooded throughout the region. The flooding suspended train service across numerous lines in Brooklyn, and every line on the New York City Subway was affected. New Jersey governor Phil Murphy declared a state of emergency for all 21 counties in the state, and Hoboken, New Jersey mayor Ravinder Bhalla also declared a state of emergency. New York governor Kathy Hochul declared a state of emergency for five boroughs in New York, including portions of Hudson Valley and Long Island, and New York City mayor Eric Adams declared a state of emergency for the city. On September 29, 2023, heavy rainfall led to flooding across portions of the New York metropolitan area and areas in New York City, United States. Southeastern New York, Southwestern Connecticut, Northeastern New Jersey ![]() Flash flooding across roadways in Flatbush, Brooklyn, New York ![]()
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