Another thing about New Orleans is that the hurriance would have to come from a SE direction for Max damage..the winds would be NNE puching all the water in the lake south..If the storm hits moving 360 degress just west The winds will be from the south..if the storm hits east into MS the city would be on the Weaker side of the storm(ie camile)
Hurricane andrew was almost a nightmare and a worst case storm...worst case would be a Cat 4-5 hitting miami..then hitting New Orleans from the SE..well the worst of the storm went a tad south of Miami thanks to a last minute jog..and it hit west of New Orleans.
The models show that a hurricane coming from the SW would inflict the most damage on New Orleans.
To see why, click link here.