Tropical Storm Isaac strengthened into a hurricane just off the U.S. Gulf Coast on Tuesday, lashing the New Orleans area with strong winds and heavy rain seven years after the city was devastated by Hurricane Katrina.
Isaac's storm surge could pose a major test of New Orleans' new flood control systems and reinforced levees. Forecasts from the U.S. National Hurricane Center showed the storm coming ashore in the Mississippi Delta late on Tuesday, possibly taking direct aim at the so-called Crescent City.
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