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Fierce thunderstorms with hail, some threatening to spawn tornadoes, swirled across the Midwest Sunday, knocking over a truck and canceling an air show.

The weather is expected to stall over the Midwest, bringing April to a soggy close with a couple of inches of rain this week across the Midwest and East Coast.

Hail and high winds hit Texas, Oklahoma and eastern Kansas early Sunday, according to AccuWeather.com. But the worst storms were expected later in the day, with tornado watches across Arkansas, Missouri and central Nebraska until 9 p.m., according to the National Weather Service.

Even without tornadoes, forecasters warned that some areas could see hail as big as baseballs and hurricane-force winds.

"The stronger storms will be capable of producing large hail up to golfball size and wind gusts to near 65 miles an hour," the weather service warned. "Hail to baseball size and destructive straight line winds to 80 miles an hour will be possible across far eastern Oklahoma and northwest Arkansas into the early evening hours."

The Missouri Highway Patrol reported a tractor-trailer was blown onto its side on Interstate 70 about 30 miles east of Kansas City about 1 p.m. No injuries were reported.

The predictions prompted Barksdale Air Force Base near Bossier City, La., to cancel its air show Sunday.

Runners took shelter as hail and high winds delayed the Oklahoma City Memorial Marathon by 105 minutes to let a severe thunderstorm pass through.

The same slow-moving weather system was expected to stall, leaving several days of cool, wet weather across the eastern third of the country. Two inches of rain is possible during the week from Chicago to New York and Washington, D.C., according to Accuweather.

Contributing: The Associated Press

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