I have to chuckle when these people who make these proclamations with such certainty regarding MJO projections and the effects. How'd this guy, Peyton, do in the fall with his MJO and Conus temp forecasts? As stated earlier, we've been in the process of going thru 4 and 5 and have had the coldest start in the east in December since 2010, and Peyton is certain with future MJO progression and the results. Just more proof you can find anybody to say anything on the internet. Personally, I think the cooling of the warm pool (which continues) has something to do with the cool temps in the east despite phases 4-6, but you won't get any research on that since so many have predicted the world's demise because of it. Time will tell.
As for the PDO, apparently an historically negative state does not preclude a +PNA. But the worm has turned on the -PDO imho.