As we get into December and a pattern change I figured it was a good time to start a new thread. Cold looks to be a certainty for almost the entire month of December as all model guidance suggest this. We will have many weak low pressure systems riding along the elongated through axis with meandering wind directions. Dry air and shear is definitely something we need to keep an eye on. There is definitely a synoptic threat with this pattern, although the northern jet looks to be the dominate forc