The storm has already wreaked havoc across the South and the Midwest, killing at least eight people, including a boy who was swept away by floodwaters in Kentucky.

Severe thunderstorms and relentless rain are triggering catastrophic flooding across the middle of the US this weekend, as areas already hit hard by a recent string of storms and tornadoes remain in the path of this current system.

A four-day, once-in-a-generation weather event is pounding the middle of the U.S. with destructive tornadoes and life-threatening flooding.