MICHIGAN — A crippling ice storm in northern Michigan has knocked out power to at least 90,000 residential and business customers. As of midday Sunday, half an inch to three-quarters of an inch of ice had accumulated in much of northeast Lower Michigan, and an inch and a half had accumulated in Elmira, near Gaylord. …Virtually all customers of the Presque Isle Electric & Gas Co-op and Alpena Power Co. were without power Sunday, some for more than 30 hours. Presque Isle reported about 32,000 electric members and reported about 32,000 outages. Alpena Power serves about 16,750 electric customers covering 250 square miles in the northeastern Lower Peninsula of Michigan and said 99% of its customers were without power. The two utilities serve much of Michigan’s northeastern Lower Peninsula. “This storm is unlike anything we have experienced,” Presque Ile co-op president and CEO Allan Berg said.