Hurricane Ida's death toll continued to rise on Sunday, with many in the U.S. Northeast holding out hope for people missing in the floodwaters, while nearly 600,000 customers in Louisiana still lacked power a week after the storm made landfall.

Ida slammed into Louisiana on Aug. 29 as a powerful Category 4 hurricane with sustained winds of 240 kph. The latest death toll there rose to at least 13 people on Sunday.

The storm weakened as it moved north but still unleashed flash flooding on the East Coast that killed at least 50 more people, according to updated numbers on Sunday.