Here comes the Arctic Chill as forecasted earlier this month on here...
See Forecast Post
Per NAO and AO as you can see below which would indicate arctic intrusion and trough in the east.
And it looks like this will continue into the start of December as higher pressures in Alaska continues the arctic slide south with the NAO staying negative.
Looking towards Thanksgiving week, an arctic wave drifting south will meet up with an Pacific system. This will likely pull the bitterly cold air sitting to the north southward. As a wave of low pressure or a couple waves slides along the front while the cold air drifts south and east. Models continue to disagree on the evolution of cold air and storm system. However it looks like you definitely need to get those Christmas lights up if you live in the east. The cold is coming and looks to be sticking around for a while as the month of December looks pretty cold from the Mississippi river east.
Here are examples of the two main long range models the GFS(US Model) and the EURO( European). Right now I believe the 500mb pattern looks better on the Euro than the GFS. The GFS is sending too much energy ahead of the main trough (feedback). This will in turn help pump the ridge across the southeast and help phase the jet streams to dig in the trough as it slides east.
Trust me I'm tracking this closely because Laura and I will be flying on Thanksgiving day back to Indy.
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