Over 500,000 people without power due to Hurricane Ida: Entergy Louisiana website

All of New Orleans, Louisiana's most populous city, had power knocked out due to "catastrophic transmission damage," the local utility reported, hours after flash-flood warnings were posted.

Hurricane Ida, making landfall as a fierce Category 4 storm, plowed into Louisiana from the Gulf Mexico on Sunday, lashing the coast with 150 mile-per-hour winds, torrential downpours and pounding surf that submerged much of the shoreline under several feet of water.