The National Hurricane Center reports that Hurricane Isaac continues to slam at Louisiana, particularly in the south at New Orleans. As a result of a breached rural levee, storm surges that were expected to reach 12 feet are now predicted to rise to 16 feet high. Hurricane Isaac is crawling northwest at 6 mph. It's slow speed and heavy rains make Isaac a "powerful force," Clarion Ledger reports. The National Hurricane Center advises that residents of the Gulf Coast remain alert.