"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 National 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. There were no immediate reports of major damage or injuries.
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.
"When I first drove into the neighborhood, I didn't see any major damage until I pulled into the front of my house," said Csaba Mathe, of Edmond, who found a part of his neighbor's fence in his swimming pool. "My reaction was: I hope insurance pays for the cleaning."
"I typically have two trash cans, and now I have five in my driveway."
The Storm Prediction Center had been warning about severe weather in the region since Wednesday, and on Friday, it zeroed in on Sunday as the day the storm system would likely pass through.
"They've been calling for this all day," Edmond resident Anita Wright said after riding out the twister in an underground shelter. She and her husband, Ed, emerged from their hiding place to find uprooted trees, downed limbs and damaged gutters in their home.
In Katie Leathers' backyard, 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."
Associated Press writers Ken Miller in Shawnee, Heather Hollingsworth in Kansas City, Mo., and Kelly P. Kissel in Little Rock, Ark., contributed to this report.