Aug 17, 2021
The combination of abundant tropical moisture and a weak upper level disturbance produced a complex of slow moving thunderstorms across the Concho Valley. As a result, very heavy rain fell in a short period of time on the morning of August 17 and produced flash flooding in San Angelo and Mertzon. Also, radar rainfall estimates were 9 to 10 inches in northwest Tom Green County, just west of OC Fisher Reservoir.
Source: NOAA National Weather Service Storm Events Database (event 981240). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Tom Green County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.