WINONA, Minn. – Winter is on our doorstep as a storm spawned by warm and moist air from the Gulf of Mexico moves north into the Great Lakes region. On Monday snow was already blanketing Iowa, posing questions about the impact in the state’s Republican caucuses next week. The storm was expected to strengthen rapidly overnight and to deliver snow and potential blizzards in southern Minnesota and adjacent Wisconsin. The National Weather pegged the chance of one to three inches of snow at 90%. Predicted Tuesday were new winds, 10 to 20 mph, which could create travel problems in open spaces.