(Reuters) -A major winter storm is expected to wallop much of the central United States and stretch to parts of the Northeast this week, bringing heaving snow, freezing rain, and ice, the National Weather Service (NWS) said. The system, which is set to begin Tuesday night and last through Thursday, could dump 6 to 12 inches (15 to 30 cm) of snow over portions of the southern Rockies and central Plains, with record snowfall possible in the Midwest as well. “While typical in terms of the time of year that you might expect something like this, potentially atypical in terms of some of the snowfall…