UPDATE 5-One killed, dozens hurt by Ohio tornadoes as U.S. Midwest braces for more

Tornadoes pulverized western Ohio early on Tuesday, killing one person, injuring scores of others and requiring emergency officials to send out snowplows to clear debris from a major highway, officials and media reports said.

At least one tornado hit Dayton and at least two touched down near the city, including one near Wright-Patterson Air Force Base, just east of the city, media reports said, part of a series of storms that have ravaged the U.S. Midwest in recent days. The National Weather Service warned there was a risk of more tornadoes and hailstorms from Tuesday afternoon into the night in Kansas and other Midwest states, while residents in Arkansas and Oklahoma braced for more record-breaking floods.

An 81-year-old man was killed in Celina, a small city 65 miles (105 km) north of Dayton, after a tornado sent a vehicle crashing into his home, Celina Mayor Jeffrey Hazel said at a news conference on Tuesday. Another seven people were injured in the storm, three of them seriously, he said. About 40 homes in Celina were seriously damaged or destroyed, Hazel said. At least 45 people in and around Dayton went to hospitals with injuries, most of them minor, according to Elizabeth Long, a spokeswoman for the Kettering Health Network.

"We've had injuries ranging form lacerations to bumps and bruises from folks being thrown around in their houses due to the storms," she said. In Clayton, Ohio, people picked through the rubble of damaged homes. Among them was Daniel Williams, who spent the night hiding in his basement, before emerging on Monday morning to find the wrecked second story of his home littering the lawn.

The latest storm follows tornadoes and floods killed at least six people in Oklahoma during the previous week, including two people in El Reno on Saturday. More than 65,000 homes and businesses in Ohio were left without power on Monday morning, according to the PowerOutage.US tracking service, and officials advised people to boil water after water plants and pumps went out of service.

Twitter users posted images of debris flying in the air and damaged mobile homes and cars. Media images online showed snowplows from the Ohio Department of Transportation clearing debris from U.S. Interstate 75 just north of the city.

The National Weather Service said multiple tornadoes were reported in the Dayton area between 11 p.m. Monday and 1 a.m. Tuesday. Seven people were reported injured in the storm in Pendleton, Indiana, on Monday, about 100 miles (160 km) west of Dayton, according to media reports.

Flooded areas of Arkansas and Oklahoma were bracing for more rain that will feed the already swollen Arkansas River, forecasters said on Tuesday. Up to 19 inches (48 cm) of rain have fallen so far in parts of Oklahoma over the month of May, the NWS said, with more on the way. Arkansas, Oklahoma and Missouri all have activated National Guard units to respond to the storms.

In Tulsa, officials were monitoring the Arkansas River after the U.S. Army Corps of Engineers raised the flow at the upriver Keystone Dam by 65% since last week to 275,000 cubic feet per second. The heavier flow is testing two aging levees in Tulsa, the city said. In Missouri, tornadoes and severe storms killed three people and destroyed or damaged hundreds of homes last week. (Reporting by Rich McKay in Atlanta, Jonathan Allen and Peter Szekely in New York; Additional reporting by Kyle Grillot in Clayton, Ohio; Editing by Scott Malone and Bill Trott)