Round and round we go with model roulette.... 00z GFS back with the Christmas cold (and a bit of light snow for some on Christmas Eve)
I think the change is mainly due to the EPO ridge orientation. In some of the previous runs, it's very strong and closed and angled more to the right. This run it's angled more up and down, not as strong, and not closed, which leads to a different angle with the downstream trough.