This isn't even in the advisories and discussions yet on the Hurricane Center site, but they are calling Isaac a hurricane. Here's a recent snapshot:
The current track puts Isaac just southwest of New Orleans with the heaviest winds and storm surge along the outer reaches of the delta and Lake Pontchartrain.
Expect a storm surge in Southeastern Louisiana and Mississippi east of where the landfall occurs of 6-12 feet, with diminishing storm surge reaching as far as the Florida West Coast. Rainfall will be between 7 and 14 inches across a large area, with isolated areas being potentially much more. Sustained winds of 70 mph and more, up to 110 mph, will affect coastal areas. Isaac is a Category I hurricane.
Landfall will be between 12 and 14 hours from now. And you know what that means.