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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)

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FILE - In this May 31, 2007, file photo, a structure is destroyed after a tornado briefly touched down in Guymon, 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/Guymon Daily Herald, Heather Avey, File)

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This photo shows the scene of a multi-vehicle crash on Interstate 94, Monday, Feb. 17, 2014, in Van Buren County, Mich. The National Weather Service said snow started Monday afternoon in Grand Rapids and roughly 3 to 4 inches had fallen by early evening. (AP Photo/Kalamazoo Gazette-MLive Media Group, Junfu Han) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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This photo shows the scene of a multi-vehicle crash on Interstate 94, Monday, Feb. 17, 2014, in Van Buren County, Mich. The National Weather Service said snow started Monday afternoon in Grand Rapids and roughly 3 to 4 inches had fallen by early evening. (AP Photo/Kalamazoo Gazette-MLive Media Group, Junfu Han) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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This photo shows the scene of a multi-vehicle crash on Interstate 94, Monday, Feb. 17, 2014, in Van Buren County, Mich. The National Weather Service said snow started Monday afternoon in Grand Rapids and roughly 3 to 4 inches had fallen by early evening. (AP Photo/Kalamazoo Gazette-MLive Media Group, Junfu Han) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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Chris Berline moves a power generator in to place Wednesday morning, Feb. 12, 2014, at a Home Depot in Frederick, Md. The National Weather Service says some of the heaviest accumulation Wednesday night through Thursday will be in Maryland's Frederick and Carroll counties as a winter storm moves through the state. (AP Photo/The Frederick News-Post, Graham Cullen)