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Rick Knabb, director of the National Hurricane Center, updates a reporter on Tropical Storm Isaac on Wednesday, Aug. 22, 2012, in Miami. The agency said Isaac was expected to strengthen and could become a hurricane by Thursday. (AP Photo/Alan Diaz)
Photo by: Alan Diaz
Rick Knabb, director of the National Hurricane Center, updates a reporter on Tropical Storm Isaac on Wednesday, Aug. 22, 2012, in Miami. The agency said Isaac was expected to strengthen and could become a hurricane by Thursday. (AP Photo/Alan Diaz)

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