Heavy Rain Triggers Flood Advisory in Nassau County, Causing Delays at JFK and LaGuardia

Heavy rain over Nassau County triggered a National Weather Service flood advisory on Sunday, August 23, causing gate hold and airborne delays of up to about 15 minutes at JFK and LaGuardia.

Original report
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Industry impact

Recurring rain-driven ground delays at major New York hubs highlight how seasonal weather volatility continues to strain air traffic flow management across the Northeast corridor.

Heavy rain swept across Nassau County and parts of the New York metropolitan area on Sunday, August 23, prompting the National Weather Service to issue a flood advisory around daybreak for Nassau County and several neighboring boroughs and counties. Communities including Garden City, Mineola, Lynbrook and Woodmere were listed among locations of concern as slow-moving showers and embedded downpours moved across western Long Island, with excessive rainfall cited as the primary hazard threatening to overwhelm storm drains and low-lying intersections.

The storm followed an already wet stretch for the region. LaGuardia Airport and John F. Kennedy International Airport each recorded more than 2 inches of rain on Thursday, August 20, and LaGuardia's August rainfall total exceeded 6 inches before the final full week of the month, running several inches above typical levels. On Sunday morning, FAA status boards showed JFK reporting gate hold and taxi delays of up to approximately 15 minutes for departing flights and similar airborne delays for arrivals, while LaGuardia saw a comparable pattern as air traffic managers spaced flights more conservatively. The FAA's Air Traffic Control System Command Center noted that Northeast airports, including New York metro hubs, had seen periodic ground-delay programs and arrival slowdowns during episodes of heavy rain and thunderstorms through August.

Ponding developed quickly in low-lying areas along major routes and local streets across Nassau County and adjacent boroughs, where debris partially blocked storm drains, while commuter rail and subway service between Nassau, Queens and Manhattan continued with only minor weather-related adjustments. Forecasters warned that additional scattered showers could redevelop later Sunday, keeping the risk of localized travel disruptions in place through at least Sunday evening, with further showers possible into the start of the workweek.