In New Orleans, memories of Katrina remain vivid 20 years later New Orleans residents reflect on rebuilding their lives 20 years after Hurricane Katrina. “Here we were really seeing that those with the highest levels of post-traumatic stress tended to report post-traumatic growth,” says Lowe, who published the results in 2014 . But researchers studying the mental health impacts of Hurricane Katrina have also discovered something surprising over the past 20 years. And yet, among those who lived, post-traumatic stress often existed with post-traumatic growth. SARAH LOWE: Those with the highest levels of post-traumatic stress tended to report post-traumatic growth.