12Z GFS....winter like cold starts to set in during the Day 11/12 time frame (Dec 9th/10th) and runs through the rest of the run to mid-month though heights start to rise at the end of the run. In that day 11/12 time frame, a trough settles in from the Northeast. No specific storm threats to discuss on this one run. This time frame is outside the scope of the CMC or Euro Op runs as of now. Prior to that the temps are quite variable between AN and BN.