MILWAUKEE (AP) — Flash flooding canceled the final day of the Wisconsin State Fair on Sunday as continued heavy rainfall in half a dozen Midwest states forced motorists to abandon their vehicles, cut power to thousands of households and closed busy roadways.

Organizers of the Wisconsin State Fair said they were scrapping the final day of the 11-day event after rains flooded the fairgrounds in West Allis, which is just outside Milwaukee.

“We are saddened we cannot deliver this final day of the Wisconsin State Fair, but know that this is the best decision with current conditions and the forecast ahead,” organizers said in a statement.

The National Weather Service issued flood watches and warnings for parts of Kansas, Iowa, Nebraska, Missouri, Illinois and Wisconsin. After rainfall began on Saturday in some areas forecasters predicted “repeated rounds of heavy rain,” along with hail, damaging winds and isolated tornadoes into Monday.

Among the worst hit was the Milwaukee area, where as many as 12 inches (30 centimeters) of rain had fallen in some areas by Sunday, according to the National Weather Service, which also noted river flooding in Milwaukee and Waukesha counties. Some motorists left their stranded cars on roads. Nearly 47,000 customers of We Energies lost power in southeast Wisconsin. In the suburban village of Wauwatosa, an overflowing and fast-moving Menomonee River submerged a popular playground.

“Really unfortunately, it’s just a really bad overlap of circumstances in terms of how all this rain fell but then fell over such a populated area,” said Andrew Quigley, a National Weather Service meteorologist.

Firefighters responded to over 600 calls including for gas leaks, flooded basements, electrical outages and water rescues, according to the Milwaukee Fire Department. Meanwhile, city crews worked overnight to clear surface water.

“We’re still in the middle of it,” Fire Chief Aaron Lipski told reporters Sunday. “We’re still catching up right now.”

USA Triathlon canceled its Sprint and Paratriathlon National Championships in Milwaukee, where thousands of athletes were expected to participate. Meanwhile, the Sunday afternoon Brewers versus Mets game at American Family Field was expected to continue as scheduled even as the parking lot remained inaccessible to traffic.

“We will not be able to guarantee parking for all fans, even those who purchased parking in advance,” the Brewers said in a statement.

City officials warned residents to avoid driving or walking in the standing waters.

“It remains dangerous," the City of Milwaukee Department of Public Works said in a statement.

On Saturday, strong winds led to the death of one person in eastern Nebraska after a tree fell on a woman’s car. In the state capital of Lincoln, the storms damaged two housing units at the Nebraska State Penitentiary, displacing 387 prisoners, the state Department of Correctional Services said. The agency said all staff and incarcerated individuals were safe and accounted for.

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