On April 27, 2011, the third deadliest tornado outbreak in recorded U.S. history hit several southeastern states, with the five most violent Enhanced Fujita (EF) [1] Scale 4 or 5 tornados occurring in Alabama between 2 and 7 p.m. The Alabama Department of Public Health (ADPH) requested epidemiologic assistance from the Centers for Disease Control and Prevention (CDC) to evaluate patterns and risk factors for tornado-related injuries and determine the mental health impact following the disaster. Trained volunteers from CDC and local universities conducted scripted interviews between January 17–31, 2012 at CDC's Emergency Operations Center. The pretested survey included address and type of location at the time of tornado impact, room type, presence of windows, floor level, and structure of material and foundation. This survey asks if helmets were used for head protection, which warning sources (e.g., TV, or ‘word of mouth’ community warnings) persons had access to and which sources were actually used. This survey also includes questions about the reaction to the sirens, the estimated annual frequency of tornado siren exposure, and past experiences with tornados being seen after hearing sirens.