About 300,000 homes and businesses in southeast Louisiana and the Mississippi coastline lost electrical power while a storm surge of 4-6 feet ( 1.2-1 .8 meters ) affected the same area , causing some beach erosion in southern Louisiana . Approximately 300,000 homes and businesses in southeast Louisiana and the Mississippi Gulf Coast lost electrical power and a storm surge of 4 â `` 6 feet ( 1.2-1 .8 m ) affected the same area , causing some beach erosion near Grand Isle , Louisiana .