The flash flood watch for San Antonio, South Central Texas and locations along the Rio Grande River and Hill Country is still in effect until Saturday, 7:00 am, reports San Antonio News Express.

According to an update from the National Weather Station, in the next 6 to 12 hours, heavy rain is expected to pour on Interstate 35. Two to four-inch rainfall is expected with some areas possibly receiving as much as 6 inches of rainfall.

A short term forecast issued by the National Weather Station September 20, 10:42 pm alerts the following locations:

Llano, Burnet, Williamson, Val Verde, Edwards, Real, Kerr, Bandera, Gillespie, Kendall, Blanco, Hays, Travis, Bastrop, Lee, Kinney, Uvalde, Frio, Atascosa, Wilson, Karnes, Gonzales, De Witt, Lavaca  and Dimmit.

The cities of Llano, Burnet, Georgetown, Del Rio, Rocksprings, Leakey, Kerrville, Bandera, Fredericksbug, Boerne, Blanco, San Marcos, Austin, Bastrop, Giddings, Brackettville, Uvalde, Hondo, San Antonio, New Braunfels, Seguin, Lockhart, La Grange, Eagle Pass, Crystal City, Pearsall, Pleasanton, Floresville, Karnes City, Gonzales, Cuero, Hallettsville and Carrizo Springs were also included in the update.

Furthermore, the update also stated that through 1:00 am, isolated patches of light rain will continue to move to the Northeast at 20 miles per hour across South Central Texas and the Hill Country. Additional rainfall amounts will also be less than 1/10^th of an inch.

The National Weather Services' forecast for San Antonio and Austin is a 20% chance of showers before 8am Saturday. The weather will eventually clear up throughout Saturday night.

Come Sunday, the weather is expected to be fairly sunny with high temperatures reaching 85 deg. F. and the North Northeast Wind at 10 miles per hour.

According to Flood Safety, San Antonio is located in one of the most flash flood prone regions in North America. The state of Texas is also prone to extremely heavy rains and flooding with half of the world record rainfall rates which is 48 hours or less.