The nightmare called Hurricane Katrina was the costliest natural disaster in U.S. history. The sheer scale of the destruction, coupled with a widely criticized government response, created a humanitarian crisis and led to a massive, long-term displacement of residents, forever altering the region’s demographic and cultural landscape.Author/Narrator Melvin Cohea was one of those residents, but not a passive victim. After two and a half days atop his roof, he was blessed with the arr...