Isaac has strengthened to a hurricane and is still heading for the Gulf Coast, forecasters said. Isaac's maximum sustained winds are 75 mph.
Flooding is the greatest threat, with torrential rain and storm surges set to smash Louisiana and Mississippi and east to Alabama and the Florida Panhandle.
Rain from the outer bands is falling on New Orleans and coastal cities, with the center of the storm forecast to reach land late this evening or overnight.
Turn to CNN TV, http://CNN.com/thisjustin and CNNs mobile apps for the latest on the storms path, where damaging winds and floods are likely to hit,and what to do.
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