A few days ago we pointed out how some weather models specifically the Canadian model was draining cold air southward into a developing Noreaster. The model run seem pretty far fetched and an obvious long long long shot. It even seemed very far out there in the extreme. However the model did point out what has happening across Southeastern Canada with regards to a building blocking ridge. The idea would be that the ridge/block would be stronger keeping a high locked in over Labrador/SE Canada rather than taking the high out to the east. As we have drawn closer to the potential noreaster time frame, other models seem to be giving a similar idea though not to the extreme of that Canadian model view of a few days ago.
Today's model runs of the GFS and to a lesser extent the European open the door slightly wider especially for areas in the Hudson Valley, Northwest New Jersey, Northeast Pennsylvania and Northern Connecticut. The GFS was especially surprising to me on this notion because this model has been the warmest of all the models all along. However it has been trending colder and bleeding cold air further south with every run....read more at http://www.meteorologistjoecioffi.com/index.php/2017/01/19/storm-threat-sunday-pm-tuesday-noreaster/