They all have strengths & weaknesses. Personally, Iike: Euro, UKMET, JMA, & CanSips. Blend the 4 in Nov & roll with it.
I'm 100% not a fam of the CFS. It's eradic. It's monthly forecast is sometimes good.
I'll throw this out there, just for interest & fun. Paul Roundy's MJO tools showing a big -EPO in early DEC:
https://www.atmos.albany.edu/facstaff/roundy/waves/rmmcyc/indexmjo.html
CFS has AO going negative for entire month which is most of the time a good indicator of PV staying relatively weak. Now, there could be major decoupling & that not be true.
JAMSTEC Updated...big winter like EURO, CanSips, & JMA. UKMET all alone at the moment:
DJF 2m Temps
DJF Precip
There's 3 groups of ensembles totalling 108 members.
2 of those groups of ensembles are really cold.
https://www.jamstec.go.jp/aplinfo/sintexf/e/seasonal/outlook.html
JMA updated its first DJF outlook:
**Individual months only go out to DEC on the 3 month outlook. Dec is a typical warmer El Nino Dec. So the above look is very JAN/FEB weighted.
**The look above is very similar to 2002-03:
Anyone remember the December 23-26, 2010 Winter Storm? Midwest storm occluded & formed a east coast low. Brought heavy snow Midwest, light snows in OV & heavy snow in NE.
One of the GFS runs kind of hints at something like that & the Ensemble mean 500mb pattern favors it. Not saying it's happening, it's pastday 10 lol. I'm just sharing:
If you walk the 500mb through day by day of the 2010 Winter storm its almost exactly like above.