According to the National Weather Service, a flash flood is flooding that begins within six hours, and often in as little as three hours, of heavy

Heavy rains caused devastating flash floods in the Texas Hill Country, killing at least 24 people and leaving many others missing.

The death toll from sudden floods in the Texas Hill Country rose to 24 Friday night, officials said, as the search for more than 20 people missing from a girls summer camp continued through the night.