Jul 17, 2019
Showers and thunderstorms developed in a sub-tropical environment ahead of the remnants of Post Tropical Cyclone Barry, resulting in flash flooding across portions of New York City and Long Island. Based on the 12Z upper air sounding from Upton, New York, precipitable water values across the region were around 2.25 inches. Rainfall amounts across these areas generally ranged from 1-2 inches, with locally higher amounts. LaGuardia Airport measured 2.67 inches of rain.
Source: NOAA National Weather Service Storm Events Database (event 847282). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Nassau County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.