IOWA CITY, Iowa (AP) — Hundreds of thousands across the Midwest remained without electricity on Tuesday after a powerful storm packing 100 mph winds battered the region a day earlier, causing widespread damage to millions of acres of crops and killing at least two people.

The storm known as a derecho tore from eastern Nebraska across Iowa and parts of Wisconsin and Illinois, blowing over trees, flipping vehicles and causing widespread damage to property and crops. The storm left downed trees and power lines that blocked roadways in Chicago and its suburbs. After leaving Chicago, the most potent part of the storm system moved over north central Indiana.

In Iowa, Gov. Kim Reynolds said early estimates indicate 10 million acres (4 million hectares) have been damaged in the nation’s top corn producing state and many grain bins were destroyed. That would be nearly a third of the roughly 31 million acres (12.5 million hectares) of land farmed in the state. The most significant damage is to the corn crop, which is in the advanced stages of development nearly a month away from the beginning of harvest.

“This morning I had a farmer reach out to me to say this was the worst wind damage to crops and farm buildings that he has ever seen across the state in such a wide area,” Reynolds said.

Satellite imagery shows extensive crop damage through about one-third of the center of the state from east to west.

“It’s incredibly devastating to see what’s happening to crops, and to structures all across the storm path,” Iowa Agriculture Secretary Mike Naig said.

Naig said tens of millions of bushels worth of commercial grain storage and millions of bushels of on-farm grain storage has been damaged or destroyed.

Roger Zylstra, who has farmed in central Iowa near Kellogg since 1980, said that four of his hog barns lost their roofs, two of his machine sheds suffered significant damage and many of his corn acres were destroyed.

Zylstra, 69, said crop insurance will help, but that the financial hit will be devastating for many farmers.

“The question remains for all of us is, what happens in the next five or six weeks? How much can we salvage out of these fields?” Zylstra said. “I know that some people won’t survive this. But there’s a fair number of people that will figure out how to hang in there, and we’ll keep doing what we do.”

The high winds continued to damage crops as the storm swept into northwestern Illinois but the wind had weakened somewhat by that point. Information about the severity of the damage was still being gathered Tuesday, said Andrea Casali, a spokeswoman for the Illinois Farm Bureau.

In Fort Wayne, Indiana, Isabel E. Atencio died at a hospital after firefighters pulled her from debris inside her mobile home after high winds rolled it onto its side Monday night, officials said. Firefighters found the 73-year-old woman under debris inside her toppled trailer and discovered that she was clutching a 5-year-old boy believed to be her grandson, said Adam O’Connor, deputy chief of the Fort Wayne Fire Department. The boy had minor injuries.

“It’s awful. I was thinking about that all last night,” O’Çonnor said.

A derecho is not quite a hurricane. It has no eye, and its winds come across in a line. But the damage it is likely to do spread over such a large area is more like an inland hurricane than a quick more powerful tornado, according to Patrick Marsh, science support chief at the National Weather Service’s Storm Prediction Center in Norman, Oklahoma.

The storm began as separate thunderstorms in South Dakota before strengthening over Iowa. It held together for 770 miles (1,200 kilometers) over 14 hours before losing strength as it entered Western Ohio, Iowa State Climatologist Justin Glisan said. By the time the system reached Des Moines, wind gusts were clocked at more than 100 mph (161 kph) Glisan said.

The National Weather Service said the storm also spawned a tornado in northern Illinois near the Wisconsin state line that damaged buildings and trees in both states.

Iowa officials reported roofs torn off homes and buildings, vehicles blown off roads and hit by trees, and people hurt by flying debris. One death and dozens of injuries were reported in the state.

A 63-year-old bicyclist died after he was struck by one of several large trees that fell Monday on a bike trail outside of Cedar Rapids near Ely, the Linn County sheriff’s office said. Thomas Rowland of Solon, Iowa, suffered extensive injuries and died at the scene, the office said.