SAN ANTONIO — A Flash Flood Warning was issued for San Antonio on Monday morning as heavy rainfall moved south from the Texas Hill Country.

Meteorologists forecast 1 to 3 inches of rain for most areas, with over 6 inches possible in localized areas. Some areas had already received up to 6 inches by Monday morning. A regional flood watch is in effect until 7 p.m. Tuesday, covering more than 20 million people from central Texas to central Mississippi.

Water rescues were reported in central and southern Texas. Emergency crews rescued a person from a stranded vehicle at a low-water crossing in Bandera County on Monday morning. Bandera County officials searched for a driver whose vehicle was swept away by floodwaters early Monday. In Travis County, emergency officials rescued one person stranded at a low-water crossing, and approximately 80 low-water crossings were flooded. Williamson County officials assisted drivers stranded at two low-water crossings. Texas Game Wardens conducted water rescues across central Texas, and the Texas Department of Transportation reported multiple stranded vehicles on Interstate 35 in Waco on Sunday night.

Matthew Kiel, a Texas Game Warden captain, said, "I have not seen flooding like that in Waco before," Heavy rain is forecast from Monday night through Tuesday south of San Antonio. Rain is expected to clear by late Tuesday.

The Alamo Colleges District and Harlandale Independent School District delayed start times to 9 a.m. on Monday. Bandera Independent School District canceled summer school classes, and Judson Independent School District canceled athletic camps, practices, and events.