A pattern change that has been taking place in the atmosphere over the past week will work to dislodge a little more Arctic air across the lower 48 heading into the upcoming weekend, and possibly through the end of the month.
Another strong storm system will develop in the southern Plains late in the week helping to draw moisture northward into the mid-Mississippi River Valley. This moisture will combine with colder air from the north leading to the potential for more accumulating snow heading into the weekend somewhere across the Missouri and Mississippi Valleys. Whether or not that means accumulating snow for us, is yet to be seen. A more northern track, similar to the storm system that passed Saturday, would favor a higher probability of snowfall for northern Illinois and southern Wisconsin. However, a more southern track would favor a lower chance for accumulating snow across the Stateline. Time will tell the exact track of this storm system, which looks to make an impact sometime during the Friday/Saturday time frame.
While the snow potential is in question, what is almost a certain will be the cold that is set to follow for the upcoming weekend. Long range outlooks have been hinting at the possibility of Arctic air becoming dislodged from the north and spilling into parts of the Great Lakes and Northeast for some time. Extended outlooks from the Climate Prediction Center are highlighting a higher probability for below normal temperatures across much of the Midwest and Great Lakes leading into the end of the month. *If* snow does occur Friday and Saturday, temperatures for the end of the weekend and start of next week may only reach the teens and low 20s, for highs! Winter may have been slow to start, but it looks like it is returning with quite a punch. With regard to any more snowfall for the weekend, stay tuned to later forecasts!
Another strong storm system will develop in the southern Plains late in the week helping to draw moisture northward into the mid-Mississippi River Valley. This moisture will combine with colder air from the north leading to the potential for more accumulating snow heading into the weekend somewhere across the Missouri and Mississippi Valleys. Whether or not that means accumulating snow for us, is yet to be seen. A more northern track, similar to the storm system that passed Saturday, would favor a higher probability of snowfall for northern Illinois and southern Wisconsin. However, a more southern track would favor a lower chance for accumulating snow across the Stateline. Time will tell the exact track of this storm system, which looks to make an impact sometime during the Friday/Saturday time frame. 
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