Last Updated Monday at 4:19 p.m. ET
SHAWNEE, Okla. A "large and extremely dangerous" tornado touched down near Oklahoma City, the National Weather Service confirmed, bringing more dangerous weather that has already claimed the lives of two people since Sunday.
The new twister is just one of several created by a storm system that swept through the nation's midsection Sunday and into Monday, with damage concentrated in central Oklahoma and Wichita, Kan. A tornado watch is in effect for northeastern Oklahoma Counties.
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On Monday spokeswoman Amy Elliot of the Oklahoma state medical examiner's office identified the two people confirmed dead from Sunday's storms as 79-year-old Glen Irish and 76-year-old Billy Hutchinson. Both men were from Shawnee.
Tornadoes were reported Sunday in Iowa, Kansas and Oklahoma as part of a storm system that stretched from Texas to Minnesota. Oklahoma's governor has declared a state of emergency in 16 counties across the state.
The powerful system spawned baseball-sized hail, and winds strong enough to flip over tractor trailers, littering them across a major interstate, reports correspondent Anna Werner.
And this area isn't in the clear just yet. More severe weather is expected.
CBS Station WFOR meteorologist Jeff Berardelli said the biggest threat Monday is in northern Oklahoma into northern Arkansas and also southern parts of Missouri, as the system moves east over the next couple of days.
Meteorologist Michael Armstrong, of CBS Affiliate KWTV, says residents should expect supercells -- or rotating thunderstorms -- to develop by 3 p.m. CT, and move east northeast.
The worst of the damage Sunday appeared to be at the Steelman Estates Mobile Home Park located amid gently rolling hills about 35 miles southeast of Oklahoma City.
"It took a dead hit," resident James Hoke said. Emerging from a storm cellar where he sought refuge with his wife and two children, Hoke found that their mobile home had vanished. "Everything is gone."
Hoke said he started trying to help neighbors and found his wife's father covered in rubble.
"My father-in-law was buried under the house. We had to pull Sheetrock off of him," Hoke said.
Forecasters had been warning of bad weather since last Wednesday and on Sunday said conditions had ripened for powerful tornadoes. Wall-to-wall broadcasts of storm information spread the word Sunday, leaving Pottawatomie County Sheriff Mike Booth grateful.
"There was a possibility a lot more people could have been injured," Booth said. "This is the worst I've seen in Pottawatomie County in my 25 years of law enforcement."
- Watch live coverage of the storm from CBS Oklahoma affiliate KOTV
- National Weather Service Storm Prediction Center
Hearing on the radio that a violent storm was approaching her rural Oklahoma neighborhood, Lindsay Carter took advantage of the advanced warning, gathered her belongings and fled. When she returned, there was little left of the community she called home.
She had heard on a radio broadcast that a storm that had originated southwest of Oklahoma City was headed toward Shawnee.
"We got in the truck and left," Carter said. With upward of 30 minutes' notice for Pottawatomie County, Carter had time to leave one of the few frame homes in Steelman Estates -- and most of her house was intact when she returned.
"I walked up, and the house was OK. Part of the roof was gone," she said.
The scene was different a short distance away.
"Trees were all gone. I walked further down and all those houses were gone," she said.
Booth said a 79-year-old man was found dead out in the open at Steelman Estates, but the sheriff didn't have details on where he had lived.
"You can see where there's absolutely nothing, then there are places where you have mobile home frames on top of each other, debris piled up," Booth said. "It looks like there's been heavy equipment in there on a demolition tour.
"It's pretty bad. It's pretty much wiped out," he said.
Following the Oklahoma twisters, local emergency officials went from home site to home site in an effort to account for everyone. Keli Cain, a spokeswoman for the Oklahoma Department of Emergency Management, said that, many times in such situations, people who are not found immediately are discovered later to have left the area ahead of the storm.
A storm spotter told the National Weather Service that the tornado left the earth "scoured" at the mobile home park. At the nearby intersection of Interstate 40 and U.S. 177, a half-dozen tractor-trailers were blown over, closing both highways for a time.
"It seemed like it went on forever. It was a big rumbling for a long time," said Shawn Savory, standing outside his damaged remodeling business in Shawnee. "It was close enough that you could feel like you could reach out and touch it."
Gov. Mary Fallin declared an emergency for 16 Oklahoma counties that suffered from severe storms and flooding during the weekend. The declaration lets local governments acquire goods quickly to respond to their residents' needs and puts the state in line for federal help if it becomes necessary.
Heavy rains and straight-line winds hit much of western Oklahoma on Saturday. Tornadoes were also reported Sunday at Edmond, Arcadia and near Wellston to the north and northeast of Oklahoma City. The supercell that generated the twisters weakened as it approached Tulsa, 90 miles to the northeast.
"I knew it was coming," said Randy Grau, who huddled with his wife and two young sons in their Edmond home's safe room when the tornado hit. He said he peered out his window as the weather worsened and believed he saw a flock of birds heading down the street.
"Then I realized it was swirling debris. That's when we shut the door of the safe room," said Grau, adding that they remained in the room for 10 minutes.
In Wichita, Kan., a tornado touched down near Mid-Content Airport on the city's southwest side shortly before 4 p.m., knocking out power to thousands of homes and businesses but bypassing the most populated areas of Kansas' biggest city. The Wichita tornado was an EF1 on the enhanced Fujita scale, with winds of 110 mph, according to the weather service.
Sedgwick County Emergency Management Director Randy Duncan said there were no reports of fatalities or injuries in Kansas.
There were also two reports of tornadoes touching down in Iowa on Sunday night, including one near Huxley, about 20 miles north of Des Moines, and one in Grundy County, which is northeast of Des Moines, according to the Des Moines Register. Six mobile homes in Earlham were damaged. Downed power lines have left about 11,000 homes and business without power across the state.
Semitrailers blew over west of Earlham and on Interstate Highway 35 near Ankeny.
In Oklahoma, aerial television news footage showed homes with significant damage northeast of Oklahoma City. Some outbuildings appeared to have been leveled, and some homes' roofs or walls had been knocked down.
In Katie Leathers' backyard in Edmond, the family's trampoline was tossed through a section of fence and a giant tree uprooted.
"I saw all the trees waving, and that's when I grabbed everyone and got into two closets," Leathers said. "All these trees just snapped."