RIO HONDO, Texas — Hours of torrential rains have left many communities in South Texas covered in floodwaters.Drone video from Rio Hondo showed extensive flooding reaching several inches deep, turning roads and yards into impromptu bays.In nearby McAllen, nearly 8 inches of rain fell.DEVASTATING SOUTH TEXAS FLOODS SUBMERGE CARS, FORCE WATER RESCUES Video and photos from the border town showed cars stuck in the high floodwaters and staff scrambling to help patients at a local medical center, where water had intruded.The heavy rain prompted the issuance of a Flash Flood Emergency for southeastern Hidalgo County. This was the first Flash Flood Emergency issued by NWS Brownsville since July 26, 2020. In total, the rain prompted the issuance of four Flash Flood Emergencies across Hidalgo and Cameron counties.