Insulation fibers from the destroyed roof of a nearby school and blown there by a tornado, cover branches of a tree in Mapleton, Iowa, Monday, April 11, 2011. A weekend tornado destroyed half of the ... more 
Insulation fibers from the destroyed roof of a nearby school and blown there by a tornado, cover branches of a tree in Mapleton, Iowa, Monday, April 11, 2011. A weekend tornado destroyed half of the western Iowa town of Mapleton, leaving trees wrapped around houses and vehicles in basements, but no one was killed and officials say the worst injury was a broken leg. Residents of a Mapleton had 15 minutes of warning before a tornado leveled more than half their community, a critical advantage in preventing any deaths or serious injuries. less 
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Associated Press | Photo By Nati Harnik
Mon, Apr 11, 2011 6:08 PM EDT