Hurricane Ida made landfall on Sunday and battered this city and much of southeast Louisiana, knocking out power, downing trees and causing havoc as the region’s most severe storm since Hurricane Katrina exactly 16 years earlier.

Ida arrived at Port Fourchon, 60 miles south of New Orleans, at midday. It was a Category 4 hurricane, the second-highest storm classification. It brought pounding rain, sustained winds of 150 miles an hour and dangerous sea surges.

All of New Orleans had lost power by Sunday night, an Entergy spokesman confirmed. More than 1 million customers statewide were without power, according to data from poweroutage.us. Earlier in the day, the Sewerage and Water Board of New Orleans advised people not to run dishwashers or washing machines to minimize wastewater because sewage pump stations had been knocked out by power outages.

The first death from the storm was reported by the Ascension Parish Sheriff’s Office, which said deputies responded Sunday night to reports of a person injured from a fallen tree and arrived to find the victim deceased.

Storm trackers said that even after several hours, the hurricane remained as strong as when it made landfall, though by early Monday morning it was downgraded, first to Category 1, then to a tropical storm.