Dec 15, 2018
A potent upper-level low and associated area of surface low pressure approached the region from southwest on the 15th. Strong forcing for ascent and ample moisture transport in advance of the upper level low led to a prolonged period of rain across the region. Eventually low pressure transferred to the coast before precipitation wound down on the 16th. Widespread rainfall totals of 2-4 inches were observed across the area.
Source: NOAA National Weather Service Storm Events Database (event 807260). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Loudoun County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.