By: Elisabeth Parker, Alessandro Marazzi Sassoon, Soumya Karlamangla, Jacey Fortin, John Yoon, Isabelle Taft, Patricia Mazzei, Tara Siegel Bernard, Valerie Boey Ramsey, Isabella Kwai, Ron Lieber
The storm leveled entire towns and left at least 42 people dead. Millions were still without power, and extreme rain left a dam in Tennessee on the brink of failure.