Hurricane Barry made landfall in Louisiana and weakened to a tropical storm on Saturday. The storm, previously a Category 1 hurricane, brought heavy rainfall and flooding to the Gulf Coast and knocked out power for tens of thousands in the region.
Officials have warned of potentially life-threatening floods.
The storm reached hurricane strength as it neared land, but has now weakened to a storm packing sustained wind speeds of 96km/h.
The system is crawling north-west at a speed of just 8mph, dumping heavy rainfall as it tracks inland.
The worst of the storm is expected to hit an area west of New Orleans, and affect the wider region.
Thousands have been evacuated from areas most at risk of flooding and other residents have been told to shelter in place.