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Baseball-Size Hail Hits Nebraska as Tornado Threat Looms

Emergency sirens went off in Omaha, Nebraska, after the National Weather Service issued a severe thunderstorm warning in parts of the state.

Baseball-size hail came down in Nebraska Tuesday as a dense pattern of severe weather moved across several states in the Plains and Midwest.

Emergency sirens went off mid-afternoon in Omaha, Nebraska, after the National Weather Service issued a severe thunderstorm warning for the eastern and central parts of the state as well as in southwest Iowa. Weather spotters in the area confirmed a tornado on the ground in central Nebraska, NWS said.

Blair residents survey hail damage in the pouring rain following a severe thunderstorm in Blair, Nebraska, Tuesday, June 3, 2014.Nati Harnik / AP

During a span of eight minutes around 5 p.m. local time (6 p.m. ET), the NWS recorded 1.08 inches of rain at the Omaha airport, which closed due to risk of flash flooding on the airfield. It reopened hours later.

Across the state, trees were uprooted, the exteriors of homes pummeled, roofs blown off, windshields shattered and hoods dented.

The National Weather Service has also issued a tornado watch warning that includes 11 counties In south central Iowa. The watch was to remain in place until 1 a.m. local time (2 a.m. ET).

A derecho — a squall line of damaging winds along a path several hundred miles wide — was possible Tuesday night and through Wednesday afternoon along parts of eastern Nebraska, eastern Kansas, Iowa, Missouri and perhaps as far east as Illinois and Indiana, according to The Weather Channel.

The National Weather Service said considerable damage to mobile homes, roofs, windows, trees and vehicles could be expected.

The Weather Channel said more than 35 million Americans are in the risk zone. It said the chance of tornadoes would be lower Wednesday but they were still possible.

The severe weather threat arrives amid an unusually quiet late spring, with fewer documented tornadoes in May than in previous years.

—Becky Bratu and The Associated Press