OKLAHOMA CITY (AP) -- Authorities are set to survey the damage left behind after tornadoes swept across the southern Plains, overturning cars and destroying dozens of homes near Oklahoma City.

At least 12 people were injured, but no deaths were immediately reported from the twisters that also hit rural parts of Texas, Kansas and Nebraska on Wednesday night.

The Oklahoma City area seemed to be the hardest hit. A twister destroyed homes in Grady County, southwest of the city, and it appeared another tornado touched down in the area later Wednesday evening when a second storm came through.

After the tornadoes passed through, flash flooding remained a concern.

The National Weather Service received widespread reports of 5 to 8 inches of rain in the area, Mitchell said. A measurement of 7.1 inches at the Oklahoma City airport set a new daily rainfall record, he said, topping the previous record of 2.61 inches.

A flash flood warning was in effect for parts of six counties in central Oklahoma until 9 a.m. The same warning was also in effect for two counties in north-central Texas. That area also saw reports of tornadoes late Wednesday, but there were no immediate reports of damage or injuries.

In Nebraska, 10 to 15 homes were damaged near Grand Island, and between Hardy and Ruskin, near the Kansas line.

At least nine tornadoes were reported in Kansas, the strongest of them in the sparsely populated north-central part of the state. That included a large tornado near the tiny town of Republic just south of the Nebraska state line, where some homes were damaged. In Harvey County, a tornado destroyed a hog barn and damaged trees, according to the National Weather Service.