I'd monitor this ... It's new. And it's emerged abruptly in the 5 hPa sigma level from the GEFs modeling.  Not sure what the EPS presently has in mind for this day-10 range, but I personally am interested in whether if any SSW activity takes place this season, given the strong solar minimum that's on-going. There is an established correlation with solar minima and SSWs.  There is also the QBO being in the positive mode, though slipping toward negative, that's actually anti-correlated/mitigates,