Christmas weekend storms in the US's southern states which unleashed floods and tornadoes have killed at least 43 people.
The wild weather has also flattened buildings, snarled transport for millions and prompted the governors of Missouri and New Mexico to declare states of emergency.
Flash floods have killed at least 13 people in Missouri and Illinois.
In Missouri, emergency workers had evacuated residents from homes and conducted dozens of water rescues, Governor Jay Nixon said on Sunday.
At least eight people had been killed and numerous roadways were closed.
Nixon said he feared continued rains would make already widespread flooding worse.
Three adults and two children were near the village of Patoka, east of St Louis, when their car was washed away on Saturday night, according to Marion County Coroner Troy Cannon.
In Texas, at least 11 people were killed in the Dallas area over the weekend by tornadoes, including one packing winds up to 322 km/h.
The twister hit the city of Garland, killing eight people and blowing vehicles off highways.
"It is total devastation," police spokesman Lieutenant Pedro Barineau said.
"It is a very difficult time to be struck by such a horrible storm the day after Christmas."
Three other deaths were reported in Dallas, the United States' fourth most populous city with about seven million residents.
Scores of people were injured and officials estimated about 800 homes may have been damaged.
Three tornadoes were reported in Arkansas on Sunday, the weather service said but there were no initial reports of significant injuries or damage.
The service has issued tornado watches and warnings for areas in that state, as well as in parts of Texas, Louisiana, Oklahoma and Mississippi.
The storms came on the heels of tornadoes that hit two days before Christmas, killing at least 18 people, including 10 in Mississippi.
In Texas, Governor Greg Abbott said his office had declared Dallas County and three nearby counties disaster areas.
He also warned people to be wary of snow in western parts of the state and rivers spilling their banks in other places.
The National Weather Service issued severe weather warnings for large parts of the central United States, including a blizzard watch for parts of New Mexico, Texas, Oklahoma and a flash flood watch stretching from Texas to Indiana.
