Details on the second death were not available as of Sunday night.
And we look with horror at the footage posted to news sites and social media - of the tornado, crushed cars, obliterated buildings and leveled trees.
In Missouri and Arkansas, some roads remained closed Sunday because of flooding.
Also in Arkansas, search and rescue teams are still searching for a four-year-old boy and his 18-month-old sister who were separated from their mother when the auto they were in was swept away, the Madison County Sheriff's Office told BuzzFeed News.
Across the USA, nine people have been killed by tornadoes and flooding in the Midwest and Southeast.
The storm left a trail of destruction in Texas, Missouri, Arkansas, Tennessee and MS, with deadly tornadoes in Texas killing four in the town of Canton, located east of the Dallas-Fort Worth area.
At least seven people have died in the severe storms rolling across the U.S.
A deadly tornado tore through one woman's dream wedding in East Texas as violent storms lashed the South and Midwest over the weekend.
The storms caused floods in neighboring states, killing a 72-year-old woman in southwestern Missouri who was washed away in her auto, according to local media reports. Also, a 65-year-old woman in DeWitt in the eastern part of the state was struck and killed in her home by a falling tree, officials said.
MS officials didn't immediately release details of the death near Durant.
More severe weather was expected in the South. Her brother was safe and the girl's body was found around midnight, police said. Hundreds of people fled their homes, a levee was breached in a rural area northwest of St. Louis, and a 57-mile stretch of Interstate 44 was closed.
The flooding killed three adults in Missouri.
The Missouri State Highway Patrol says a 72-year-old woman drowned despite her husband's efforts to save her as their vehicle was swept away by rushing waters Saturday near Clever in southwest Missouri.
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"Many areas from Louisiana up toward Missouri and into IL saw rainfall totals over 7 inches (with some localized amounts up to a foot) fall within 48 hours".
The confirmed death toll rose to 16.
At least four were killed and 49 people were hurt, Canton Mayor Lou Ann Everett said.
According to the Van Zandt County Sheriff's Office, Van Zandt County has established an account for donations.
The town of Canton, located about 80 kilometres east of Dallas, was especially hard hit.
Evacuations could be necessary as areas along swollen waterways could see widespread flooding as the weather service issued flood warnings and watches for the weekend and into next week.
Henderson County Precinct 2 Commissioner Wade McKinney, who serves the Eustace area reports crews were out clearing debris from roadways, mostly trees felled by the storm.
A total of 36 patients were reported receiving treatment at East Texas Medical Center in Athens for storm related injuries.
Horton, of the Canton Fire Department, told reporters that a triage has been set up at a high school, the AP reports.
A severe thunderstorm located over Fort Benning in Georgia was at risk for developing into a twister, the weather service said. Powerful storms swept through Canton early Saturday evening, leaving behind a trail of overturned vehicles, mangled trees and damaged homes.
According to ETMC Regional Health Care Systems spokeswoman Rebecca Berkley, 56 people were taken to the hospital.
Mattie Coleman, laughs outside what remains of her combination flower shop, thrift store and laundromat facility Monday, May 1, 2017, in Durant, Miss., as she cleans up from a possible tornado hit on Sunday morning.
National Weather Service meteorologist Patricia Sanchez says one of those tornadoes, with winds of more than 135 mph, was on the ground for 51 miles.