Today's weather models have come closer together on the arrival of cold air beginning on Wednesday as a cold front passes. Once that front goes by both the GFS & European model show the front slowing down an stalling out. The GFS was the first to show this idea a few days ago before abandoning it and then coming back westward. First though is the cold front that approaches Tuesday night and Wednesday morning.
Both the European and the GFS are on point with this front. There is a chance that for areas west and north of the coast that the rain could end as some sleet or wet snow Wednesday morning. After that it gets complicated a bit. While the front sits to our south a wave develops along the front and moves northeastward Thursday night and Friday.
Notice a second low is dropping southeastward into NW Missouri at the same time. This is a reflection of a strong upper air trough that is digging southeastward from Canada. The problem here is that the systems are far enough apart that they basically behave as separate entities. The wave will move out ahead of the energy which would prevent this from becoming anything major.
The European model is slower with that upstream energy by about 24 hours as it swings that system...READ MORE AT http://www.meteorologistjoecioffi.com/index.php/2017/12/02/weather-models-cold-active-long-range/