A strong storm front that proved deadly in Iowa moved through northern Illinois and southern Wisconsin on Monday, bringing with it hurricane-force winds and thunderstorms that damaged homes and took down trees and power lines. The National Weather Service issued thunderstorm and flash flood warnings west of Milwaukee and Chicago as storm spotters reported 70 mph (112 kph) winds and baseball and golf ball-size hail that pelted parts of Iowa earlier on Monday. One person was killed in Linn County, Iowa, the sheriff’s office said, where storm spotters reported a building collapse in heavy winds that also snapped limbs and downed trees.