An area of vorticity (an eddy current in the mid level of the atmosphere) is moving through today, giving us unexpected mid level cloudiness.   We get these often in November and early December, but I’m not sure why the models didn’t show this on Friday.

This vorticity accompanies a change to a southerly flow in the upper atmosphere.  Warmer temperatures expected through early Wednesday until a front moves through, bringing us much colder and winter-like conditions for Thursday through next weekend.