The waters did not stat rising until 1.5 hours after that and no-one had been evacuated
https://www.npr.org/2025/07/05/nx-s1-5457759/texas-floods-timeline
"....Around 3:30 a.m. the Kerrville City Manager Dalton Rice said he was out for an early morning jog along the Guadalupe River and saw "not a drop of rain," according to Lt. Gov. Dan Patrick, who recounted his conversation with the city manager. Rice added that he left around 4 a.m. when "there was very light rain…We did not see any signs of the river rising at that time.".....