TAYLORVILLE, Ill. -- Central Illinois residents assessed the damage Monday after rare December tornadoes, including one that was a half-mile-wide and injured at least 20 people.

The severe weather in Illinois was part of a line of thunderstorms that raked areas of the central U.S. late Friday and into Saturday, killing one person in Missouri. The National Weather Service confirmed tornadoes in Illinois, Missouri and Oklahoma.

At least three tornadoes were confirmed in northwest and southwest Arkansas, which largely caused property and structural damage. No injuries or fatalities were reported.

Peak months for tornadoes in much of the Midwest are April and June, according to the weather service. But at least 23 tornado touchdowns on Saturday have been confirmed in Illinois, said Dan Smith, a meteorologist with the weather service's Lincoln, Illinois, office.

That was the most tornadoes in Illinois during a December storm since a Dec. 18-19, 1957, outbreak produced 21, Smith said Monday afternoon. He said that number may grow because crews continue surveying three other sites to determine if storm damage there was also caused by tornadoes.

The weather service sent crews Sunday to survey the hardest-hit areas in Illinois, which included Taylorville, 25 miles (40 kilometres) southeast of Springfield. Preliminary estimates indicate that storm may have produced winds of up to 130 mph (209 kilometres per hour).

Photographs and video from Taylorville showed several houses flattened, with residents wading into debris to salvage what they could. Some homes remained standing but with gaping holes in the roofs or with no roofs at all.

The tornado was on the ground for around 10 miles (16 kilometres) before it thundered through Taylorville, and the weather service was able to warn residents of its arrival 41 minutes before it actually struck, Chris Miller, a meteorologist at the service's Lincoln office, said in a phone interview Sunday. That advanced warning gave people critical time to take cover and may have saved lives.

Assistant Fire Chief Andy Goodall, speaking to reporters Saturday night shortly after the storm pounded the city of 11,000, said at least 100 homes had major damage, including his own, Springfield's State Journal-Register reported.

A Taylorville Memorial Hospital spokesman said 21 people, from age 9 to 97, arrived for treatment Saturday. Most were released within hours. Miller said three people remained hospitalized as of Sunday afternoon.

Miller said preliminary estimates are that the Taylorville tornado may have been an EF2, which indicates wind speeds as high as 135 mph. It could take several more days to know for sure.

The weather service said Sunday that a strong tornado that developed from severe thunderstorms Friday night touched down in Van Buren, Arkansas. It was rated an EF2. About 10 minutes later, a second weaker tornado was confirmed less than 10 miles (16 kilometres) away near the town of Rudy, Arkansas.

Damage surveys for the two tornadoes are ongoing but officials said dozens of homes were damaged.

Early Saturday morning a third tornado with estimated peak winds of 107 mph travelled about 8.5 miles (13.5 kilometres) through Spring Hill in southwest Arkansas. Its path was intermittent and mostly caused damage to trees and to some structures.

------

Associated Press writer Hannah Grabenstein in Little Rock, Arkansas, also contributed to this report.