UVALDE, Texas (AP) — Slow-moving storms with heavy rain were drenching a large swath of South Texas on Wednesday, spawning a tornado in San Antonio a day after downpours washed out roads and farmland and led to dozens of high-water rescues in the region.The National Weather Service said a tornado touched down in the northwestern part of San Antonio near Interstate 10. Videos posted on social media showed what appeared to be a small twister. There were no immediate reports of injuries.Warnings of potentially dangerous flash flooding, meanwhile, were posted in some areas as the deluge was expected to continue through Thursday evening. The weather service said 10 to 20 inches (25 to 50 centimeters) of rain was possible in some areas by the time the storms move out.There have been no reports of deaths or injuries from the flooding.Flash flood warnings were posted Wednesday morning for several counties near the Mexico border including parts of Kerr County, where catastrophic flooding along the Guadalupe River last year killed more than 100 people. Kerr County officials said they have been in contact with summer camps and retreat centers where river flooding could happen.The highest rainfall totals so far have been in Uvalde County — up to 16 inches (40 centimeters) in some areas, the weather service said.