New Orleans Orders Mandatory Evacuation Ahead Of Gustav Spooked by predictions that Hurricane Gustav could grow into a Category 5 monster, an estimated 1 million people fled the Gulf Coast Saturday — even before the official order came for New Orleans residents to get out of the way of a storm taking dead aim at Louisiana. Mayor Ray Nagin gave the mandatory order late Saturday, but all day residents took to buses, trains, planes and cars — clogging roadways leading away from New Orleans.