These storms are associated with a system that produced severe weather in parts of the Midwest and the South that killed 14 people over the weekend.
The National Weather Service said at least 3 tornadoes struck Eustace, Caney City and Canton in Northeast Texas.
In Canton, a largely rural area 50 miles east of Dallas, Texas, search teams were seen going door to door after a tornado caused extensive damage. Flooding also closed roads in hundreds of other places around Missouri.
"It is heartbreaking and upsetting to say the least", Everett told reporters at a news conference Sunday morning.
In middle Tennessee, powerful storms uprooted trees and damaged power lines early Sunday. The most severe damage was reported in Van Zandt County, near Canton. The US is hit by an average of more than 1,000 tornadoes per year, according to NOAA.
Severe storms including tornadoes swept through several small towns in East Texas, killing several and leaving a trail of overturned vehicles, mangled trees and damaged homes, authorities said Sunday.
Mayor Lou Ann Everett said on Sunday at least four people died and nearly 50 others injured, according to local media.
The weekend round of storms included high-intensity winds, hail and isolated tornadoes in East Texas. In Jefferson County, south of St. Louis, a 78-year-old man drowned after walking to a creek to look at rising water.
National Weather Service surveyors have already confirmed seven tornadoes in MS, and Gov. Phil Bryant said the total could rise to as many as 20.
On Sunday, Arkansas Gov. Asa Hutchinson declared a state of emergency following severe storms and flooding across the state.
The Mississippi River was well above flood stage at several points, including Cape Girardeau, Missouri, where it is expected to crest later this week within a half-foot of the all-time record of 48.9 feet.
The state reported that there were 100 evacuations and by far troopers has rescued three dozens of people this late afternoon.
Flood warnings remained in effect for some areas of the state on Sunday.
A woman was killed by a falling tree near Fayetteville, Tennessee, on Sunday, Angela Phelps with the Lincoln County Department of Emergency Management confirmed to CNN.
A fire chief in Arkansas was killed in an accident Sunday morning while checking an area during a thunderstorm, the Cleburne County Sheriff's office said on its Facebook page.
In western Kansas, tens of thousands of people lost electricity after up to 20 inches of snow fell, accompanied by winds up to 60 miles per hour.
Tornados reportedly tore roofs from houses, ripped trees out of the ground and tossed cars around "like toys".