53 million people at risk

"People can fall into complacency because they don't see severe weather and tornadoes, but we do stress that they should keep a vigilant eye on the weather and have a means to hear a tornado warning because things can change very quickly," said Matt Friedlein, another meteorologist with the Weather Service, told The Associated Press.http://usnews.nbcnews.com/_news/2013/11/17/21503619-53-million-people-at-risk-as-powerful-midwest-storm-brings-tornadoes-severe-winds?lite