20 tornadoes reported in 7 states across the Plains

At least 20 tornadoes were reported in seven states overnight into Tuesday, as the tornado threat continues for parts of the country.

The twisters were reported in Iowa, Kansas, Missouri, Nebraska, Oklahoma, South Dakota and Tennessee.

One of the hardest-hit areas in the storm was Barnsdall and Bartlesville, Oklahoma, north of Tulsa. The National Weather Service in Tulsa found low-end EF4 damage near Barnsdall during the tornado survey process on Tuesday.

One person was killed and several injured in Barnsdall, which sustained “significant damage” due to the tornado, according to Barnsdall Mayor Johnny Kelley.

“We need a lot of prayers,” Kelley told reporters during a press briefing following the tornado.

Some 60 to 70 homes in the small town were “totally destroyed,” among approximately 350 destroyed statewide, Oklahoma Gov. Kevin Stitt said.

Approximately 25 people were rescued following an initial search, Kelley said. One person remains unaccounted for as another search effort got underway Tuesday, he said.

The missing man was in his trailer home talking to his son on the phone just minutes before the tornado came through, according to Stitt. Police K-9 units are involved in the search, he said.

“We’re just praying a miracle happens,” Stitt told reporters during a press briefing Tuesday evening.

Stitt has declared a state of emergency for several counties in the state due to the severe weather.

The destructive tornado was the second to hit Barnsdall in recent weeks.

“It’s a devastating blow to the people in the community,” Kelley said. “It’s going to be life-changing.”

NOAA’s Storm Prediction Center in Norman, Oklahoma, had issued the highest-possible severe weather risk alert for multiple intense, long-track tornadoes Monday afternoon and evening.

The tornado threat moves into Ohio Valley and parts of the southern Great Lakes Tuesday afternoon and evening. Some 35 million Americans are in the storm zone, from Chicago to Nashville, Tennessee.

A tornado watch was issued for parts of Illinois, Indiana, Michigan, Ohio and Kentucky into Tuesday night. A few tornadoes, damaging gusts up to 70 mph and baseball-sized hail are likely.

Multiple particularly dangerous situation tornado warnings were in effect for southeast Michigan Tuesday evening – with a Tornado Emergency issued for Union City, MI. It was the first Tornado Emergency for the state of Michigan on record, going back to 1999.

Kentucky Gov. Andy Beshear urged residents to prepare for the severe weather — including “potentially significant tornadoes,” flooding, hail and high winds — expected to hit much of the state over the next few days.

“We have been through all of those and we have seen how deadly they can be,” Beshear said during a press briefing Tuesday. “So we need everyone to take action now by making a plan to keep yourself and your family safe.”

ABC News’ Kenton Gewecke and Melissa Griffin contributed to this report.