Tropical Storm Harvey has made landfall again in the US state of Louisiana after hovering in the Gulf of Mexico.
Low-lying New Orleans, devastated by 2005's Hurricane Katrina, is bracing to receive up to 10 inches of rain in 36 hours, with flash floods a major risk.
The storm, which previously reached hurricane status, has dumped record rainfall in the region.
Large parts of the Texas city of Houston are underwater, and more than 20 people are reported dead.
Thousands of people there have fled their homes in search of emergency shelters amid severe flooding.
However, forecasters say the weather is now improving in Texas. Sun is predicted for Houston in the days ahead, potentially allowing respite and a chance to tackle the damage.
Houston, America's fourth most populous city, has implemented a night-time curfew to prevent looting while homes remain abandoned.
Authorities and volunteers are also still battling to rescue stranded people and provide shelter for those made homeless by rising waters.
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