A heavy storm in southern Utah Saturday evening caused flash flooding in Washington County.

William J. Alder, meteorologist in charge of the Salt Lake office of the National Weather Service, said observers in St. George reported receiving an inch of rain in 30 minutes.A St. George police dispatcher said the flooding dumped debris and rocks that blocked Sunset Boulevard, and had rocks and dirt rolling off Airport Road. She said crews were sent to clear boulders from that road.

Several cars on Dixie Downs Road in St. George were stalled in high water and mud, the dispatcher said.

Road flooding was also reported on parts of U-18 between St. George and Veyo. And up to 2 feet of water was reported over parts of U-9, the highway between I-15 and Hurricane.

A Washington County sheriff's office dispatcher also said Leeds has some flash flooding after it received .81 inches of rain in 45 minutes, but no injuries or major damage had been reported.

A Utah Highway Patrol dispatcher in Cedar City also said it had reports of flash flooding in the area around Quail Creek Reservoir in Washington County. The National Weather Service had received reports of flooding there in campgrounds, and heard that water was almost topping some small bridges.

The heavy rain, which began about 5:30 p.m., caused the National Weather Service to issue a flash-flood warning Saturday evening, meaning flash floods were imminent or under way. The warning was scheduled to expire at 7:30 p.m.

Forecasts call for cloudier and rainier weather in southern Utah on Sunday, but showers should be widely scattered and mostly near the mountains. The northern part of the state should continue to have fair to partly cloudy skies Sunday and Monday, with a dry air mass hovering over northern Utah - meaning more moisture and possible scattered showers in the afternoon and evenings.