Severe thunderstorms, strong winds and heavy rain across the eastern U.S. could impact voter turnout in Tuesday's midterm elections, according to an AccuWeather analysis.

The possible storms in the Mid-Atlantic could affect up to 5 million people, the Storm Prediction Center said. Damaging wind gusts and even tornadoes may hit the area, the center said, while isolated gusts may strike the Carolinas and eastern Gulf states. Marginally severe hail may also occur late Tuesday in Oklahoma and Arkansas.

A tornado in Christiana, Tennessee, early Tuesday killed one person and injured at least two others, the National Weather Service in Nashville said. The preliminary rating for the tornado was an EF-2 with 135-mph winds.

Tuesday morning, WGNS radio in Murfreesboro identified the woman who died as Angie Walker, who was married to station president Scott Walker.

Almost 20,000 customers in Tennessee were without power midday Tuesday, according to PowerOutage.us.

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Weather causes nearly 20 percent of the change in voter turnout on average, according to AccuWeather data scientist and meteorologist Tim Loftus.

Those 65 and older, 18- to 24-year-olds and African-Americans are among the most sensitive to severe weather conditions, Loftus said.

In Florida's Panhandle, showers and thunderstorms may prevent people from walking to polling stations or waiting outside to vote. Throughout the state, Loftus said the muggy conditions expected Tuesday have been associated with lower voter turnout in the past.

Higher humidity has also led to lower voter turnout in Mississippi, where sticky air is expected to remain in the state's southernmost areas on Tuesday. Although northern and central parts of the state can expect lower humidity, residents could be dealing with storm damage and outages.

To the north in New York, rain and wind gusts as high as 50 mph Tuesday could also deter voters, Loftus said. Before the storm progresses with the day, warmer-than-average early-morning temperatures may be more favorable for voting.

On Monday, there were four reports of tornadoes across the South in Louisiana, Alabama and Tennessee.

Contributing: The Associated Press; The Tennessean