This map (PDF) shows the areas of the city by zones that would be called in an evacuation. You can also go to the state system, type in your address, and learn your zone letter. Remember that if an evacuation is ordered, to listen for the zone and the city. Not all of the state's Zone A areas would be evacuated at the same time.
This older map gives some indications of the levels of flooding that would be expected based on storm surge during a Category 1, 2, 3 or 4 hurricane. Hurricane surge zone map (PDF)