A significant winter storm is forecasted to impact the Green Bay area starting Sunday night, December 28, 2025. According to the National Weather Service, rain will transition to snow between 8 p.m. and midnight, with expected snow accumulation reaching 4-6 inches by the afternoon of December 29. The storm system will primarily affect northeastern Wisconsin, with heavier snowfall anticipated near the Upper Peninsula border, where accumulations could approach a foot. Areas south of the Fox Valley, including Milwaukee, are expected to receive 1-2 inches of snow. A winter storm warning is in effect for several counties, including Brown, Door, Kewaunee, Calumet, Manitowoc, Outagamie, and parts of Marinette and Oconto, from midnight December 28 until 6 p.m. December 29.