More than 1 million homes and businesses were without power Monday across a swath of Louisiana and Mississippi as Ida, downgraded from a furious Category 4 hurricane to a tropical storm, still pounded the region with heavy rains and storm surge. Ida, which roared onto the Gulf Coast near Port Fourchon, Louisiana, on Sunday with 150-mph winds, knocked out power to the entire city of New Orleans. On Monday morning the storm was centered over southwestern Mississippi. Levees failed or were overtopped along some rivers and bayous south of New Orleans, threatening hundreds of homes. People posted their addresses and locations on social media to direct rescue teams to their attics or rooftops. Roofs were torn off some buildings by the powerful winds, which had decreased to about 45 mph but tropical storm-force winds extended out 150 miles. Ida is tied for the fifth-strongest hurricane to ever hit the U.S. mainland and struck 16 years to the day after deadly Hurricane Katrina in New Orleans. Photos show collapsed buildings, including destruction in the French Quarter, and more in the wake of the ongoing storm's dangerous winds. 📷: @apnews, AFP via @gettyimages #HurricaneIda #TropicalStorm #weather #stormwatch #Louisiana