A bone numbing mass of frigid air blasted into much of the Midwest and Great Lakes on Sunday. By Monday afternoon the cold had swept into much of the Northeast. Temperatures fell to 40 below zero at International Falls, Minnesota, now referenced as the "Icebox" of the nation. Chicago's high reach 1 above on Sunday and 12 on Monday as the snow began to fly again. By Monday night snow began spreading from Iowa and Illinois into Indiana and Michigan as another winter storm was taking shape over the Midwest. Snow will fall on snow across much of the Midwest overnight into Tuesday before the storm heads into the Northeast on Wednesday. More cold is expected to follow by the weekend.