NEW : Cars also clogged Interstates 55 and 59 heading north out of eastern Louisiana . Mandatory evacuations set to begin 8 a.m. Sunday in Florida . Hurricane watch issued from southeastern Florida to Alabama - New Orleans border . 1,200 evacuating south Louisiana on buses , trains , planes . Gustav 's sustained winds reach 150 mph as it roars past Cuba .
NEW : Mandatory evacuations set to begin 8 a.m. Sunday in Florida . Hurricane watch issued from southeastern Florida to Alabama - New Orleans border . 1,200 evacuating south Louisiana on buses , trains , planes . Gustav 's sustained winds reach 150 mph as it roars past Cuba .