Aug 12, 2018
A weak disturbance just north of a stalled stationary boundary provided a focusing mechanism for heavy rainfall that resulted in isolated flash flooding across parts of Long Island. In an environment with precipitable water values around two inches, rainfall amounts ranged from 1-3 across much of Nassau and Suffolk counties. In Suffolk County, a CWOP station reported 2.79 of rain in Mastic Beach, while in Nassau County a 2.15 of rain was reported in North Bellmore via social media.
Source: NOAA National Weather Service Storm Events Database (event 779809). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Suffolk County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.