FILE - In this May 20, 2013, file photo, a tornado moves through Moore, Okla. as northbound traffic on Interstate 35 stops at Indian Hills Road in Moore, Okla. The National Weather Service in Norman has used Twitter and Facebook for years to disseminate weather warnings. But they tried a new approach recently, holding an online “tornado drill.” (AP Photo/Alonzo Adams, File)
Featured Photo Galleries
