Against the advice of authorities, young people frolic in the high surf on the Lake Pontchartrain lakefront in Mandeville, La. as Isaac batters the north shore with high winds and high tides, Wednesday Aug. 29, 2012. (AP Photo/The Times-Picayune, Ted Jackson) MAGS OUT; NO SALES; USA TODAY OUT
Gallery: More photos from Hurricane Isaac
Aug. 30, 2012 @ 11:37 AM
Hurricane Isaac poured unrelenting rain Thursday, flooding areas north and south of New Orleans even as the city's fortified defenses held and forcing officials to launch speedy evacuation and rescue efforts in the face of fast-rising waters.