The monstrous, swift-moving flood that swept through the Hill Country of west-central Texas Friday, killing at least 13 and leaving nearly two dozen missing, was a flash flood, the nation's top storm-related killer.

Torrential rains unleashed deadly flash floods along the Guadalupe River in south-central Texas on Friday (Jul 4), killing at least 13 people and initially leaving nearly two-dozen girls missing from a riverfront summer camp,

The Guadalupe River near Kerrville swelled to its second highest height on record. A stark reminder of life in a warming world.