"It is a heartbreaking situation," Randolph said.
While storms continued to pass through the state, Cain said, "they're much less severe." However, "there's still a lot of flooding in areas," she said, warning residents to stay off roads and avoid high water.
Weather forecasters lifted an emergency for parts of the tornado-prone Midwestern state, though flash flood warnings, severe thunderstorm watches and tornado watches remained in place.
Photos showed streets looking like rivers, with stranded cars submerged in water as high as their door handles in some places.
National Weather Service's Storm Prediction Center in Norman, Oklahoma warned the severe weather was shifting eastward Saturday, with the Ohio and Mississippi River Valleys set to receive the bulk of the storms.
"Large hail, damaging winds and isolated strong tornadoes are all possible," the weather center said on its website.
In Missouri, which borders the Mississippi River, Governor Jay Nixon declared a state of emergency Friday night, urging "Missourians to closely monitor weather conditions, so they can take shelter or move to higher ground if needed."