(Non weather-geek summary:) In all, I am definitely seeing a colder pattern in store for the next few weeks. The abundant high pressure over the Arctic Circle extending into Greenland is a good sign for a sustained presence of cold air, but the largely-undisturbed jet stream means this cold air will not be as intense as a winter month like January. The big storm threats are definitely going to reside along the South Plains and Gulf Coast for severe weather, as well as the Eastern Seaboard for snowfall.
(Weather Geek summary:) Atmospheric indices around the globe suggest the world pattern is also gearing up for a chillier tone. Negative Earth AAM combined with GWO moving into Stage 4 suggest the subtropical jet stream will indeed be enhanced in the presence of this shifting pattern. Very deep -AO and -NAO tell me a rather chilly regime is probable across portions of the North US. Zonal flow will keep the cold in check and hold the coldest air at bay. Snowstorm threats will reside in the Eastern Seaboard in cooperation with the -NAO and GWO. Hesitant WPO/EPO combo means this cold outbreak will not be one for the books, nor may it even be called an outbreak.