Larry Cosgrove:
Maybe a ten day break from the widespread cold. But a look at the formative ridging around and above the Arctic Circle suggests a return to prolonged, full-latitude cAk (bitter cold) by the end of the first week of December.
You would be hard pressed to use the word warm today, except perhaps in southern Florida or coastal California. And truthfully, descriptions of cold weather will be in use through the weekend. But the thumb-projection blocking ridge off of the West Coast will start to break down next Monday and Tuesday, and a period of semizonal flow at 500MB should favor a relatively mild condition from the Mississippi Valley to the West Coast over a November 23 -30 time frame. I hesitate to bring the warmth all the way to the Eastern Seaboard, since a vigorous southern branch storm out of Texas and Oklahoma may out the brakes on moderation by the end of the 6-10 day time frame.
That disturbance may not fully stop the warm-up, but I can see two factors that will return the USA and Canada to the icebox as we get past the start of December. A ridge complex now In Scandinavia will begin to retrogress into Greenland (-NAO), linking with a weaker positive 500MB height anomaly over the Arctic Ocean (-AO). That will force a deep storm over the northern Pacific Basin to track eastward along the International Border into the Great Lakes. Remember the rule about cAk vortices: the closer a gyre gets to the lower 48 states, or into the nation, the deeper and more widespread the awful chill will get. If things work out as I expect them too, the period between December 7 and 21 will feature high usage of fuels and other energy sources to keep the people warm in the face of winter.
And the moisture-laden southern branch storm track will be heard from as well. Hint hint. Sleep well tonight.