NEW ORLEANS - More than 1.2 million people in metropolitan New Orleans were warned to get out as 140-mph Hurricane Ivan churned toward the Gulf Coast, threatening to submerge this below-sea-level city in what could be the most disastrous storm to hit in nearly 40 years.Residents streamed inland in bumper-to-bumper traffic in an agonizingly slow exodus Tuesday amid dire warnings that Ivan could overwhelm New Orleans with up to 20 feet of filthy, chemical-polluted water. About three-quarters of a million more people along the coast in Florida, Mississippi and Alabama also were told to evacuate. Forecasters said Ivan, blamed for at least 68 deaths in the Caribbean, could reach 160 mph and strengthen to Category 5, the highest level, by the time it blows ashore as early as Thursday somewhere along the Gulf Coast.
