At least half a million households and businesses were in the dark on Sunday morning after Hurricane Delta, which hit Louisiana, weakened to a post-tropical cyclone and headed across the Southeast.

Most of the customers without electricity, about 360,000 of them, were in Louisiana, where the hurricane made landfall Friday, according to poweroutage.us. Another 67,000 customers in Texas were without power, while Mississippi reported almost 34,000 outages.

About 15,000 were without power in Georgia and South Carolina, where Delta was expected to dump rain Sunday before moving up the East Coast.

The storm still had 30 mph winds early Sunday, though it was expected to weaken significantly by early Monday, according to the National Weather Service.

Northeast Georgia and the western portion of Virginia and the Carolinas could see up to 6 inches of rain, creating flash flooding risks across the region, the weather service said. The Central Appalachians and southern New Jersey could get drenched as well, forecasters said.

Tornadoes are possible across the Carolinas on Sunday, the weather service said. Flash flooding is possible from north Georgia to southern Virginia.

Five tornadoes were reported in the Atlanta metro area. In Covington, east of Atlanta, a suspected tornado left one person with minor injuries and damaged a homeless shelter, displacing 30 people, the city's emergency management director, Jody Nolan, told CNN.

"Even if it wasn't quite as powerful as Hurricane Laura it was much bigger," Louisiana Gov. John Bel Edwards said Saturday. "Obviously, this was a very serious, very large and powerful storm that produced significant amounts of damage."

(With input from agencies)