Number of warning information sources and decision-making during tornadoes.

Background Taking proper protective action upon receiving tornado warnings is critical to reducing casualties. With more warning information sources becoming available, how the number of such information sources affects decision making should be quantitatively investigated. Purpose To examine how the number of warning information sources affected individuals' decisions to take protective action during tornadoes. Methods A telephone survey using random sampling was conducted in 2012 with residents in Tuscaloosa AL