Next shot of Arctic cold is dropping into the Upper Plains and is delivering snow to eastern MT and western ND.
MT DOT Cam near Miles City, MT
The front edge of this cold will continue to sink south and east. By sunrise Wednesday, the cold front will stretch from Green Bay-Kirksville-Oklahoma City-Amarillo. A band of snow will follow behind the front. Tonight it will develop across SD and by morning it will stretch into southern MN/western WI and across much of northern IA/NE. This band of snow will track off to the east-northeast on Wednesday through WI and northern IL. Rain will begin to accompany the front edge of the cold air by midday Wednesday across much of MO. This rain will expand along the front into Wednesday night. A line of thunderstorms is also likely to develop from NE TX into LA/MS.
As cold air drops in quickly behind the front, rain will likely mix and change over to a brief period of snow from central MO east and northeast through east central MO/central IL and northern IN. The heaviest snowfall through Thursday morning will fall from southern SD eastward across central WI and across much of MI.
By noon Thursday, the cold front will stretch from Burlington, VT-NYC-DC-Pensacola. Snow will be falling across much of NY and PA with rain from SE LA to the western Carolinas. In addition up slope snow with wind will be occurring across northern CO through much of WY.