Jon Gambrell

DAMASCUS, Ark. -- Violent storms rolling across the nation's midsection unleashed tornadoes, high winds and hail in four states and killed seven people in Arkansas on Friday, including a teenager who died when a tree fell into her bedroom as she slept.

Greg Carbin, a meteorologist for the national Storm Prediction Center in Norman, Okla., said as many as 25 tornadoes may have cut through stretches of Oklahoma, Arkansas, eastern Kansas and western Missouri.

Five of those killed were in two north-central Arkansas counties, Conway and Van Buren, that also saw fatalities from a devastating tornado Feb. 5. Gov. Mike Beebe declared those counties and five others disaster areas.

"This year it just seems like we're getting pounded," Van Buren County Sheriff Scott Bradley said.

He said a man, a woman and a preschool-age child died when the storm hit their house just south of Bee Branch.

"There wasn't anything left," Bradley said. "It was demolished."

Another child who lived at the home had already left for school, escaping injury.

A father and son died in Conway County when a possible tornado hit their mobile home. A twister demolished a chicken farm in Center Springs, leaving thousands of dead birds on the ground.

Near the Oklahoma line in a working-class neighborhood of Siloam Springs, a 15-year-old girl died in the early morning when apparent straight-line winds toppled a tree into her family's mobile home. She and her 10-year-old brother were sleeping in bunk beds; the boy survived with minor injuries.

"She was on [the top bunk]. He was on bottom. When it fell, it just crushed her and pinned her on top of him," with a mattress between them, said Chad Tilghman, who lives across the street and helped pull the boy from the storm debris.

The seventh death was reported in Pulaski County, south of Little Rock.

More than a dozen injuries were reported, and about 350 homes were damaged or destroyed in several Arkansas counties.

Kansas City Mayor Mark Funkhouser said 100 homes suffered significant damage in the city alone. Damage was also reported in the suburbs and in Lawrence, to the west. An 18-wheeler was blown over on Interstate 29 in Riverside, near five empty train cars that were toppled.

In northeast Kansas City, dozens of homes had chunks of their roofs missing, and trees were knocked from their roots and lying along the roads and in ditches. Police blocked off roads around the damaged neighborhoods Friday.

Tornadoes appeared to touch down in at least three east Texas towns, uprooting trees, flipping cars and yanking down power lines.

A tornado hit Canton, Texas, as visitors began to show up for a popular open-air market that draws thousands each month. The winds toppled tents and snapped power lines, but the market was soon back in business.

Three people in Canton were taken to hospitals; two had been at the market and had reported chest pains. City Secretary Julie Seymore said that no major injuries were reported and that overall damage was minimal.

At least three tornadoes raked central and northern Oklahoma, including one in Osage County near Tulsa that was an estimated 100 yards wide, but no serious injuries were reported there. A home was destroyed and about a dozen others were damaged in northeastern Oklahoma, and a hotel under construction near Tulsa was destroyed.

The storms moved into Kentucky and Tennessee Friday evening.

A day before the Kentucky Derby, some race fans at Churchill Downs sought shelter Friday when the storms arrived in Louisville. The Weather Service issued a tornado warning for parts of far western Kentucky, and meteorologist John Gordon said two more waves of storms were expected Friday night and Saturday afternoon.

Rain was possible until about 6 p.m. EDT Saturday, just as the race is scheduled to start, but Gordon said he didn't think it would be extreme enough to affect the race.

Churchill Downs spokesman John Asher said the track was monitoring the weather but didn't anticipate heavy rain to interrupt racing.

"This track handles water as well as any track in the country," he said.

There have been more than 700 preliminary reports of tornadoes this year, but the final number of confirmed tornadoes is expected to be lower.

The Weather Service has confirmed 84 tornadoes nationwide for January -- compared with a three-year average of 34 -- and February was busier than usual, as well, Carbin said. He said it generally takes about two months to confirm actual numbers of tornadoes.

• Associated Press Writers Kelly P. Kissel in Siloam Springs, Ark., Sean Murphy in Oklahoma City and Andale Gross in Gladstone, Mo., contributed to this report.