A major winter storm developing over the southern U.S. is expected to move slowly north into the Upper Mississippi Valley on Christmas Day. This storm system is drawing warm and very moist air northward from the Gulf of Mexico. Heavy rain, snow melt, and ice jams may lead to flooding in low lying locations and rapid rises on area rivers. Christmas Day, as the storm pulls to the north and west of the region, colder temperatures will wrap around around and change the precipitation back over to snow. Most of the area will see light accumulations, with totals of 2 to 4 inches of snow before it tapers off Saturday. Those with holiday travel plans are urged to stay tuned for the latest information on this major storm.