On the afternoon of May 22^nd, 2011, Edith Lawellin was startled by an alarm from her hall: “Tornado warning. Evacuate immediately.” Like many residents of Joplin, Missouri, she had a storm closet (a reinforced room under the stairs). She ran for the closet, locked the door, and only minutes later, an airborne car tore through her house. Finally, only the closet was left standing. If not for her security system’s just-in-time warning, Edith is convinced she would have died that night.