As the jet stream dips south this afternoon the majority of the accumulating snowfall will stay south of the Stateline. Decreasing cloud cover tonight will set the stage for a very cold night with lows dropping into the teens by dawn Tuesday.
Many locations in northern Minnesota, Wisconsin and the Upper Pennisula of Michigan have almost half a foot of snow on the ground already with a decent amount of Canada already experiencing close to a foot of snow. Often times this will have an impact on temperatures here in the Stateline. If winds within in the jet stream are mainly from the north the snow pack will modify that air mass helping to cool it before it reaches southern Wisconsin and northern Illinois. If the jet stream winds are mainly from an area that is lacking any sufficient snow the incoming air mass won't be as cold. As we get deeper into the winter season and the upstream snow pack continues to grow and deepen the colder snaps tend to be a little more harsh than the low to mid 30s we'll be experiencing this afternoon.
Many locations in northern Minnesota, Wisconsin and the Upper Pennisula of Michigan have almost half a foot of snow on the ground already with a decent amount of Canada already experiencing close to a foot of snow. Often times this will have an impact on temperatures here in the Stateline. If winds within in the jet stream are mainly from the north the snow pack will modify that air mass helping to cool it before it reaches southern Wisconsin and northern Illinois. If the jet stream winds are mainly from an area that is lacking any sufficient snow the incoming air mass won't be as cold. As we get deeper into the winter season and the upstream snow pack continues to grow and deepen the colder snaps tend to be a little more harsh than the low to mid 30s we'll be experiencing this afternoon. 
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