A flash flood is a rapid rise of water along a stream or in a low-lying urban area, the National Weather Service said. Flash flooding can result from slow-moving thunderstorms, from numerous thunderstorms that develop repeatedly over the same area, or from heavy rains associated with tropical cyclones.

Officials announced on Sunday that the overall death toll in the ongoing Texas flooding has risen past 130 killed. There are 106 confirmed deaths in hard-hit Kerr County, with 36 believed to be children.