The National Hurricane Center reports that Isaac has downgraded to a tropical storm. Its maximum sustained winds slipped to 70 mph. Isaac has already caused more than 725,000 people to be without power across five states.
Mayor Mitch LandrieuÂ has issued a dusk-to-dawn curfew as the storm continues to pound the city of New Orleans.
Isaac, downgraded to tropical storm, still packs a punch
Louisiana and Mississippi officials conducted search-and-rescue missions Wednesday for residents stranded by Tropical Storm Isaac, which flooded highways and homes and caused numerous levee breaches.
While Isaac lost its hurricane status Wednesday afternoon, officials warned of continued life-threatening hazards from storm surges and local flooding. The situation was particularly dire in Plaquemines Parish, southeast of New Orleans.
Isaac threatened to keep churning for another day.
Dozens of Louisiana families that had ignored mandatory evacuation orders in a low-lying area retreated to their attics and roofs and sought rescue amid the howling wind and pounding rain.