The National Weather Service in Austin/San Antonio has issued a Flood Watch for portions of south central Texas, effective from Wednesday evening through Friday evening.
A weather pattern change is expected to begin on Wednesday as an approaching upper-level low over the southwestern United States weakens the subtropical ridge axis over Texas and the western Gulf. Isolated to scattered showers and thunderstorms are forecast to develop during daytime hours. A Pacific cold front will move into the region on Thursday, spreading showers and thunderstorms across a broader area.
Rainfall totals from Wednesday evening through Friday are expected to range between 2 and 4 inches, with isolated amounts up to 8 inches possible. This excessive rainfall brings the potential for life-threatening flooding somewhere in the watch area.
Impacts may include flooding of rivers, creeks, streams, and other low-lying or flood-prone locations. Creeks and streams could rise out of their banks, and flooding may occur in poor drainage and urban areas. Additionally, low-water crossings may become flooded, leading to extensive street flooding.
Affected counties include Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet, Caldwell, Comal, Dimmit, Edwards, Frio, Gillespie, Gonzales, Guadalupe, Hays, Kendall, Kerr, Kinney, Llano, Maverick, Medina, Real, Travis, Uvalde, Val Verde, Williamson, Wilson, and Zavala.