Some Isaac basics. The storm is about 200 miles wide of tropical storm winds.. It is expected to make landfall as a category one storm .. it is expected to produce 7 to 14 inches of rain. Due to the large storm in the amount of miles wide it is a big storm surge is expected for low-lying areas such as New Orleans..
The levee system has been supposedly bettered since Katrina and 2005, but I don't think officials expected a test of that system so soon..
But soon it will be tested, the store impacts are already going to begin shortly with bands of rain coming onto the coastline, and after that drenching downpours and flooding will begin..
May God watch over this area. Pray for these fine folks, because there's nothing left but that to do now.