"Rain is likely tonight, ending tomorrow. Thursday will be fair and cooler." So began the final and most destructive act of Hurricane Camille, a storm so ferocious that scientists calculated the odds as once in a thousand years. In 1969, meteorologists were yet to have satellite and computer technology at their disposal, and the National Hurricane Center’s director, Dr. Robert Simpson, could only rely on his instincts to predict Camille’s track. The Category Five storm, with wind gusts over 200 miles per hour, tore into the Mississippi/Alabama coast, erasing entire towns. At a hurricane party on a rooftop a few miles from where Camille made landfall, the nearly three-story tidal storm surge—the highest ever measured—collapsed the entire building and swept 23 people to their deaths. Incredibly, the worst was yet to come. As Camille hit the mountains of western Virginia she also collided with two other weather systems that squeezed millions of tons of water...