(NEWSER) - Gustav grew into a fierce Category 4 hurricane and slammed into Cuba this afternoon as the nation scrambled to evacuate its most populated areas, the AP reports. The storm, which had been upgraded to a Category 3 just hours earlier, now has 145mph winds and remains on path to hit the Gulf Coast on Monday. In New Orleans, lines at bus stations are growing, and highway traffic is thick. The city hasn't ordered a mandatory evacuation, but it's helping the elderly and most vulnerable get out. More»