Twice a week the ECMWF is run out to one month and we see an average of the 500mb heights for the week from all the ensemble members. I just looked at last night’s run. Of course you can never read too much into these maps, but sometimes they give us a general idea of what might be ahead. In this case it appears some sort of higher than normal heights (ridging) wants to stick around through at least mid January. We’ll see.