Aug 2, 2009
A cold front arriving from the west late in the day on the 2nd moved into a warm and moist air mass, which resulted in thunderstorms across the area with torrential rainfall. Hunterdon County reported the worst damage. Flooding occurred from Mercer and Hunterdon Counties northeast through Morris and Middlesex Counties. Doppler Radar storm total estimates average 1.5 to 3.0 inches across the region, most of which fell within one hour.
Source: NOAA National Weather Service Storm Events Database (event 193432). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Mercer County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.