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Cleanup efforts are underway in Winterset, Iowa, on March 6, 2022, after a tornado tore through an area southwest of town on Saturday.Bryon Houlgrave/The Register/The Associated Press

Seven people were killed, including two children, when several tornadoes swept through central Iowa, destroying homes and knocking down trees and power lines in the state’s deadliest storm in more than a decade, authorities said.

Emergency management officials in Madison County said four were injured and six people were killed Saturday when one tornado touched down in the area southwest of Des Moines near the town of Winterset around 4:30 p.m. Among those killed were two children under the age of five and four adults.

In Lucas County, about 54 miles southeast of Des Moines, officials confirmed one death and multiple reported injuries when a separate tornado struck less than an hour later.

The state Department of Natural Resources said that person who died was in an RV at a campground at Red Haw State Park in Chariton, Iowa.

Thunderstorms that spawned tornadoes moved through much of Iowa from the afternoon until Saturday night with storms also causing damage in the Des Moines suburb of Norwalk, areas just east of Des Moines and other areas of eastern Iowa. The storms were fueled by warm, moist air from the Gulf of Mexico.

Officials reported a number of homes were damaged or destroyed, roads were blocked by downed lines and tree branches were shredded by the strong winds. At one point, power outages affected about 10,000 in the Des Moines area.

The storms are the deadliest to occur in Iowa since May 2008 when one tornado destroyed nearly 300 homes and killed nine people in the northern Iowa city of Parkersburg. Another tornado a month later killed four boys at the Little Sioux Boy Scout ranch in western Iowa.

The National Weather Service in Des Moines tweeted early Sunday that there were at least three thunderstorms producing tornadoes, but it’s “unknown at this time how many tornadoes occurred.”

Northern Illinois University meteorology professor Victor Gensini said there have been plenty of examples of deadly storms in March even though they are more common in April and May. Saturday’s storms were not nearly as unusual as the mid-December tornado outbreak that Iowa saw last year, he said.

“The storms that produce these tornadoes – these supercell storms – they don’t care what the calendar says,” Gensini said. “It doesn’t have to say June. It doesn’t have to say May. They form whenever the ingredients are present. And they were certainly present yesterday.”

Scientists have said that extreme weather events and warmer temperatures are more likely to occur with human-caused climate change. However, scientifically attributing a storm system to global warming requires specific analysis and computer simulations that take time, haven’t been done and sometimes show no clear connection.

Gensini said Saturday’s storms likely caused more than US$1-billion in damages over their entire track when the severe damage in Iowa is combined with wind damage as far away as Illinois.

Iowa Gov. Kim Reynolds issued a disaster proclamation for Madison County, which allows state resources to be used to assist with response and recovery efforts. Madison County Emergency Management Director Diogenes Ayala said 52 homes were damaged or destroyed across nearly 14 miles.

After touring the storm damage near Winterset, Reynolds described “unimaginable destruction.”

Reynolds teared up as she described the hundreds of people who streamed into the area to volunteer their help to clear debris that blocked roads and littered the hardest hit areas. Homeowners and volunteers were picking up wood debris and beginning to clear it away Sunday in the rolling hills south of Winterset as chainsaws whirred away in the background.

“It’s just unbelievable. I tried to walk through and thank them and over and over (and) the response was, we’re Iowans and that’s what we do,” she said.

The foundation was all that was left of several homes. The tornado carved a path of destruction along a ridge while several hundred feet away other homes were undamaged.

Ayala said emergency responders navigated narrow roads blocked by downed trees and debris Saturday night to help after the storm.

“With trees and debris and everything around, just to go out there and start the search and rescue and get the people affected out of there, I cannot express the heroism of the first responders who were out there last night,” Ayala said.

Officials identified the six people who were killed in Madison County as Melissa Bazley, 63; Rodney Clark, 64; Cecilia Lloyd, 72; Michael Bolger, 37; Kenley Bolger, 5; and Owen Bolger, 2. The victims came from three different households.

Lucas County officials didn’t immediately identify the person who died there Sunday afternoon.

Six people hurt in Madison County, which is known for the “Bridges of Madison County” book and movie, were being treated for injuries Sunday, but their conditions weren’t immediately available.

The National Weather Service in Des Moines tweeted Saturday that initial photos and videos from the damage around the community of Winterset suggested it was at least an EF-3 tornado, capable of causing severe damage, on the Enhanced Fujita scale. It said weather service teams would investigate the damage Sunday and further assess a potential rating.

EF-3 storms typically have winds between 136 mph and 165 mph.

The storm that generated Saturday’s tornadoes hung together for roughly 100 miles from the Nebraska border into central Iowa but it won’t be clear until after the damage assessments are completed how long the individual tornadoes were on the ground.

Elsewhere, the National Weather Service said the storms generated an EF-1 tornado in southeastern Wisconsin near Stoughton that included winds up to 80 mph. The storm flattened trees, snapped power poles and blew out windows in homes. No injuries were reported.

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