Tornadoes touched down in parts of Texas and South Dakota on Saturday, knocking over mobile homes, ripping the roofs off houses and barns and downing power lines, authorities reported.

At least two people were reported injured when a twister blew over four mobile homes in Plainview, Texas, authorities said. Information about the extent of the injuries was not immediately available.Plainview is about 300 miles northwest of Dallas.

The National Weather Service said tornadoes and other severe weather destroyed at least two barns and took the roofs off two homes near the Black Hills community of Edgemont, in western South Dakota about 65 miles southwest of Rapid City.

The twisters also knocked over some garages and blew out windows.

No injuries were immediately reported in South Dakota, but one man was missing Saturday after flash floods swept away mobile homes and forced campers out of a state park. The town's water system was also knocked out of service.

Two men had to spend the night in a tree to escape the high water when rains swelled the White River some 16 feet above its normal flood stage of 31/2 feet. Hundreds of cattle were killed when a stockyard flooded.

Thunderstorms late Friday dumped up to 7 inches of rain in Nebraska. A Dawes County deputy found hail 7 inches in diameter, said Crawford police.

In Mississippi, a man was found dead after torrential rains battered the already soaked state. Heavy rains have been falling since the middle of April.