Amazing. This is a newsflash from a local TV station in New Orleans, about Jefferson parish (emphasis in the original): "Jeff Parish President. Residents will probably be allowed back in town in a week, with identification only, but only to get essentials and clothing. You will then be asked to leave and not come back for one month."

Late Update: Here, from the Times-Picayune, is a piece with much more detail on the recovery plan for Jefferson parish.