Jul 6, 2021
A slow-moving low pressure system drew in ample amounts of Gulf moisture on July 6th, allowing for very heavy rainfall to occur across portions of the Lower Rio Grande Valley. Several rounds of rain fell in Hidalgo and Willacy County, particularly in the town of Mercedes where a significant flash flooding event occurred, necessitating water rescues and several road closures. In total, 6 to 10 inches fell in a swath from near La Joya (Hidalgo County) to the ranches of southeast Kenedy County, in
Source: NOAA National Weather Service Storm Events Database (event 964426). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Hidalgo County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.