At least 15 people have been killed in the states of Mississippi, Tennessee and Arkansas since Thursday, officials said.
With more severe weather expected across the central United States, forecasters are warning of airport delays and flooded roads as travellers return home after the Christmas holiday.
Feeding on unseasonably warm air, storms left a trail of destruction in rural communities from Alabama to Illinois.
More than a dozen tornadoes were reported yesterday in six southern states.
"The damage was ... Confined to approximately one square mile," Birmingham Fire Department Chief Charles Gordon told CNN. "We have three houses that collapsed."
No one died, but Gordon said victims were rescued from the debris.
Mississippi Governor Phil Bryant and Georgia Governor Nathan Deal also declared states of emergency in counties affected by the weather.
Forecasters at the National Weather Service warned that the central United States "will continue to have widespread showers and thunderstorms this weekend."
The NWS warned that "flash flooding will be possible" today in the area.
In Mississippi, eight people were confirmed dead and another 60 injured, the state emergency management agency said on Twitter.
Among them was a seven-year-old boy killed when a storm picked up and tossed the car he was travelling in, fire chief Kenny Holbrook told reporters in the town of Holly Springs.
Six fatalities were confirmed in Tennessee, including three people found dead Thursday in a car submerged in a creek, according to the fire department in Columbia, Tennessee.
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