55-56 is probably the best PDO analog right now. This is why I say that they are probably using the PDO.
October 1955 was the only year lower than this October.
They also had a big +EPO in October, which models are showing in the long range right now
We had a big -NAO Sept 19 - Oct 11 this year, so this is a good H5 match + a few weeks.
Have you guys seen how cold the CPC actually is in the Upper Midwest?
Maybe Minneapolis being so anomalously warm last year will try to even out? They must really be expecting the WPO and EPO to go negative. I had this opinion several months ago, but not so much recently.