The Upper Midwest had a long duration winter storm event that developed Monday morning, December 2nd, and eventually evolved into a large storm system that moved from the Plains, northeast across the Upper Midwest and western Great Lakes region by late Wednesday night.
A weak disturbance produced locally two to six inches across central Minnesota from Long Prairie, eastward to Milaca, North Branch, and into Wisconsin from Monday morning to Tuesday morning. An isolated 8.2 inch total occurred north of Mora in northern Kanabec County. Some of the precipitation changed over to rain in east central Minnesota as warmer air began to surge northward.
By early Tuesday, much warmer air from the southern United States produced precipitation in the form of sleet, rain and snow that fell through late Tuesday evening across portions of south central and east central Minnesota. The mixture of precipitation eventually changed over to all snow Tuesday night, into Wednesday and produced a swath of 6 to 9 inches of snow from southwest Minnesota, northeast to central, east central Minnesota, and into portions of west central Wisconsin.
The heaviest snow fell late Wednesday morning, into early Wednesday evening as the surface low tracked from eastern Kansas, north-northeast to Lake Superior. Some of the higher snowfall totals include; south of Hillman in Morrison County with 9.2 inches, 8.5 inches near St. Michael in Wright County, and 7.8 inches south of Bird Island in Renville County of southwest Minnesota.