Flash Flood in Nassau County, New York
Flash Flood September 29, 2023 · Nassau County, New York
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Shelter Rock Road at Searingtown Road is closedu in both directions due to flooding.
The wider storm
An inverted trough extending from a low pressure system over the Western Atlantic provided a focus for persistent heavy convective rain to continually develop over the NYC metro and surrounding areas during much of the day on September 29th, 2023. In an environment with anomalously high moisture given the time of year, PWATs near 1.5-1.7 inches, rounds of heavy rainfall fell over the same areas for more than 12-18 hours. While the rainfall rates were generally 1 inch per hour or less, the persistence in the heavier rainfall resulted in a widespread total of 4-6 inches of rain with JFK receiving almost 9 inches of rain from the event. There were some brief periods of time where rainfall rates peaked at near 2 inches per hour. This resulted in widespread flash flooding across Southeast NY and Southern Connecticut.
Began near East Williston (40.7600, -73.6600).
Source: NOAA Storm Events Database, event 1135794. Narratives are written by the National Weather Service forecast office that issued the report.
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