Jul 1, 2021
Despite prolonged periods of dry weather before the event, deep moisture from the Gulf of Mexico pooled across the lower Mid-Atlantic ahead of an approaching cold front. Precipitable water values by the afternoon of July 1st were estimated to have reached the 1.8 to 2 inch range. Strong afternoon heating, combined with steepened lapse rates associated with a passing upper level disturbance, produced a highly unstable atmosphere causing localized wind damage from severe thunderstorms. While wi
Source: NOAA National Weather Service Storm Events Database (event 957408). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Montgomery County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.