Photo Gallery: Hurrricane Isaac 49/70

A motorist drives through a flooded street on Tuesday, Aug. 28, 2012, in Bay St. Louis, Miss.  Mandatory evacuation had been ordered by Tuesday in low-lying areas of all three Mississippi coastal counties, and waves were washing across beachside roads as Hurricane Isaac swirled offshore. All three coastal counties also set overnight curfews. The U.S. National Hurricane Center in Miami said Isaac became a Category 1 hurricane Tuesday with winds of 75 mph. It could get stronger by the time it's expected to reach the swampy coast of southeast Louisiana. (AP Photo/John Bazemore) ORG XMIT: MSJB102