Flash Flood in Richmond County, New York

Flash Flood August 22, 2021 · Richmond County, New York

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

St. Johns Avenue in Grasmere was flooded with water up to the hood of a car.

The wider storm

Showers and thunderstorms streaming northward well ahead of approaching Hurricane Henri resulted in flash flooding across portions of New York City and Western Long Island. This rainfall developed in a moisture-rich environment, with the 8pm sounding from Upton, NY recording precipitable water values around 2.25 inches. Rainfall totals from this predecessor rainfall event ranged from 1-5 inches. The ASOS in Central Park recorded 4.45 inches of rain for August 21, a new record for the date, much of which fell within a three hour period from 9pm to midnight.

Began near South Beach (40.6069, -74.0757).

Source: NOAA Storm Events Database, event 981808. Narratives are written by the National Weather Service forecast office that issued the report.

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