Isaac nears hurricane strenght as it moves toward New Orleans

NEW ORLEANS — Tropical Storm Isaac was declared a hurricane Tuesday as it swirled through the warm waters of the Gulf of Mexico, pointed toward the fragile lowlands of south Louisiana and the ever-vulnerable city of New Orleans.
The National Hurricane Center announced at 12:20 p.m. Eastern time that Isaac had reached Category 1 hurricane strength, packing maximum sustained winds of 75 mph. The winds of a tropical storm range from 39 to 73 mph. The center said the upgrade was based on reconnaissance data.

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