Aug 21, 2018
Low pressure passed by to the west toward the Great Lakes. The warm front associated with the low moved through the area while the cold front associated with the low approached from the west. There was enough lift associated with the warm front to combine with a warm and humid atmosphere, resulting in showers and thunderstorms. Rainfall was heavy at times which resulted in flooding.
Source: NOAA National Weather Service Storm Events Database (event 777990). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Fairfax County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.