Nearly 8,000 Omaha Public Power District customers lost power early Tuesday as a strong line of hail-producing thunderstorms moved through eastern Nebraska and western Iowa.

By 3:40 p.m., the utility company reported 37 customers still without power in Douglas County. Fourteen customers were without power in Sarpy County. 

At 4:17 a.m., the National Weather Service office in Valley issued a flash flood warning for Douglas County, northwestern Sarpy County, southern Washington County and western Pottawattamie County in Iowa. 

Doppler radar indicated heavy rain across the warning area, the National Weather Service said.

Council Bluffs received 2.04 inches of rain. Omaha's Eppley Airfield reported 1.65 inches, Valley reported 1.26 inches and the Millard Airport reported .93 of an inch of rain.

"We're looking for a little break later this morning," said Valley-based weather service meteorologist David Pearson. "We can expect another quarter to half inch of rain as the storm takes some time to move through the area."

Locations expected to experience flooding include Omaha, Council Bluffs, Bellevue, Papillion, La Vista, Ralston, Wahoo, Gretna, Valley, Arlington, Yutan, Fort Calhoun, Waterloo, Cedar Bluffs, Mead, Kennard, Weston, Prague, Elkhorn and Millard.

The U.S. Storm Prediction Center said parts of southeast Nebraska and southwest Iowa are at risk for severe weather Tuesday afternoon, said Van DeWald, a Valley-based meteorologist with the National Weather Service.

The greatest threat for storms will be around Nebraska City into southwest Iowa, he said. "Omaha is right on the northern edge of some of the stronger stuff," said DeWald, referring to hail, strong winds and possibly tornadoes. It will be "a very active day," he said.

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Omaha police reported several vehicles stalled in street flooding, including two vehicles near 50th and F Streets and another at the intersection of Saddle Creek Road and Hamilton Street. Before 7 a.m., a driver called 911 to say he couldn't get out of his car near 132nd Street and West Center Road because of high water. Reports of missing manhole covers also were coming in from across the city. 

Officers also reported numerous areas where street construction barricades had been blown over or were washed away. Traffic lights were without power at several locations, police reported, including 144th Street and Industrial Road and 66th and Harrison Streets. 

The National Weather Service issued a flash flood warning for central Lancaster County at 5:10 a.m.

In western Nebraska Monday night, hail larger than 2 inches in diameter was reported west of Ogallala. An Omaha-bound driver counted 50 cars pulled off Interstate 80 with broken windshields after the hail moved through. 

Hailstones ranging from golf ball to baseball size were reported along the I-80 corridor, said Brandon Thorne, a meteorologist with the National Weather Service office in North Platte. A report of baseball-sized hail was turned in by the Sutherland Fire Department, he said.

"We've gotten reports of hail pretty much all along I-80 from the Colorado border to Gothenburg," Thorne said. "We had inch-and-a-quarter hail here in North Platte."

The storm began near Fort Morgan, Colorado and tracked north on Interstate 76 before turning east into Nebraska near the intersection with I-80, Thorne said. A separate storm system ignited near Imperial, producing hail about 3 inches in diameter, he said.

In Lincoln, law enforcement reported flash flooding after more than 2 inches of rain fell.

Lincoln, Waverly, Conestoga State Recreation Area and Pawnee State Recreation Area were all in the flash flood warning area. Interstate 80 in Nebraska between mile markers 390 and 454 also were in the targeted area. 

Kevin Cole covers Omaha crime and public safety news. Follow him on Twitter @KevinColeOmaha. Phone: 402-444-1272.

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