(Reuters) -The official tally of storm-related deaths across Texas rose to 131 on Monday as authorities warned of yet another round of heavy rains 10 days after a Hill Country flash flood that transformed the Guadalupe River into a killer torrent. A National Weather Service flood watch forecasting heavy downpours of up to half a foot of rain was posted until Tuesday morning for a wide swath of central Texas extending from the Rio Grande east to San Antonio and Austin. The advisory included Kerr County and other parts of Texas Hill Country along the Guadalupe still recovering from the July 4 flood disaster, which ravaged the county seat of Kerrville and a riverside Christian summer camp for girls in the nearby town of Hunt.