Image: Twister funnel
Billy Hefton  /  Hennessey News & Eagle via AP
A tornado touches down just north of Hennessey, Okla., on Wednesday near U.S. Highway 81.
updated 5/20/2010 10:21:26 AM ET 2010-05-20T14:21:26

Severe weather was forecast to continue sweeping through the South on Thursday, a day after at least a half-dozen tornadoes touched down in Oklahoma, causing some damage and power outages but few injuries.

The National Weather Service reported tornadoes in mostly sparsely populated areas of central and northern Oklahoma, although warnings extended as far south and east as the Oklahoma City and Tulsa metropolitan areas.

One minor injury was reported and power lines were knocked down as severe thunderstorms hit Kingfisher County, northwest of Oklahoma City, emergency management director Steve Loftis said. A semi overturned about five miles north of Kingfisher, and the driver was taken to a nearby hospital with injuries that weren't considered life-threatening, Loftis said.

A tornado touched down briefly in an open area near Hennessey, about 60 miles northwest of Oklahoma City, Loftis said. A tornado also was reported near Loyal, bringing down power lines, and the town of Kingfisher, about 45 miles northwest of Oklahoma City, was without power, he said.

The storms came less than a day after severe weather produced at least three tornadoes and other strong storms.

Video: Storm system moving east Early Wednesday, a truck driver was injured when straight-line winds blew over a semitrailer on Interstate 35 near Tonkawa, about 20 miles south of the Kansas state line, said Oklahoma Department of Emergency Management spokeswoman Michelann Ooten.

The driver was taken to a local hospital and his condition was not known, Ooten said. Two other semitrailers also were blown over on the interstate, she said.

As much as three inches of rain that caused minor flooding in Tonkawa around 6 a.m., Ooten said.

"Emergency management officials told us they also had about 20 minutes of pea to nickel sized hail and high winds," she said.

Strong thunderstorms produced straight-line winds with gusts up to 60 mph and small hail in that area, said Daryl Williams, a forecaster with the National Weather Service in Norman.

A tornado also was reported near Arnett in Ellis County just before 1:30 a.m. Wednesday. The tornado was on the ground for only a few seconds and no injuries or damage were reported, said Emergency Management Director Russell Miller.

Two brief touchdowns were also reported Tuesday night near Guymon, according to the National Weather Service in Amarillo, Texas.

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