National Weather Service warns of frigid temperatures

      Much of the upper Midwest is bracing for more snowfall and frigid temperatures.

      The National Weather Service has put parts of eight states under a blizzard warning for Sunday. The warning is in effect for Chicago and much of northern Illinois, all of Iowa, large sections of southern Minnesota and Wisconsin, and smaller areas in North Dakota, South Dakota, Missouri and Michigan.

      Most of the rest of the region was under a winter storm warning or a hard freeze watch.

      The heavy storm was moving eastward a day after it dumped 20 inches of snow in parts of the region, forcing numerous road closures and even postponing for a day an NFL football game between the New York Giants and Minnesota Vikings.