![]() ![]() ![]() Weather stations in New York City saw rain rates over 3 inches per hour. Newark, New Jersey, recorded 8.41 inches of rain, their most ever in a single day, shattering the old record by over 1.5 inches. ![]() That led to major flash flooding and more than 45 deaths in the region. The widespread, intense rainfall overwhelmed rivers and drainage systems in the highly populated corridor from Philadelphia to New York to Boston. Weather forecasters saw the disaster coming.įorecasters emphasized the threat of flash flooding well ahead of its arrival, and the National Oceanic and Atmospheric Administration’s Weather Prediction Center issued a rare “ high risk” of excessive rainfall outlook for parts of the Northeast a day in advance. That was happening as Ida’s remnants moved toward the Northeast. That moist air is lifted along the fronts, and long-lasting, very heavy rain can result. Even though they no longer have the intense winds that they did in the tropics, they still bring tropical humidity. 1-2, 2021.ĬoCoRaHS Mapping System, CC BY-ND From tropical to extratropicalĪs hurricanes move northward from the tropics, they often transition from their characteristic circular shape to become “extratropical cyclones” with warm and cold fronts extending outward from the low pressure at the center. Second, evidence is mounting that, as the climate warms, the amount of precipitation from heavy rainstorms is increasing, especially in the central and eastern U.S. Two major factors likely contributed to its extended extreme rainfall.įirst, Ida’s tropical moisture interacted with developing warm and cold fronts. Ida had weakened well below hurricane strength by the time it reached the Northeast, so how did it still cause so much rain? The storm had already wreaked havoc on the Gulf Coast after hitting Louisiana three days earlier as a Category 4 hurricane. Water poured into subway stations in New York City, and streets flooded up to the rooftops of cars in Philadelphia. 1, 2021, hitting some with more than 3 inches of rain an hour. Record downpours from Hurricane Ida overwhelmed cities across the Northeast on Sept. Philadelphia’s Manayunk neighborhood was flooded by the remnants of Hurricane Ida. See the entire list of contributing faculty and their articles here. Colorado State is a contributing institution to The Conversation, an independent collaboration between editors and academics that provides informed news analysis and commentary to the general public. Editor’s note: Russ Schumacher, associate professor of atmospheric science at Colorado State University, wrote this piece for The Conversation in September 2021. ![]()
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