A storm packing heavy snow and howling wind moved north Sunday, knocking out power in homes and making conditions hazardous for holiday travelers in the US Midwest and Plains states. High wind and ice that coated power lines blacked out tens of thousands of people in Michigan, Illinois and Wisconsin. Ice slicked roadways through the region. "Everything is just an ice rink out there," said Rock County Sheriff's Sergeant Steve Selby in Wisconsin. Some 74,000 customers were without power in Michigan on Sunday morning, down from 104,000 at the peak, Consumers Energy said. In Illinois, about 58,000 customers were without power in the Chicago metro area and 5,500 others were in the dark in southern and central Wisconsin.