The jet stream in the Northern Hemisphere has crossed the equator and joined up with the jet stream in the Southern Hemisphere. This seems like new behaviour, and indicates that climate system mayhem is ongoing.
YOUTUBE CKasUm77D0U Published on Jun 28, 2016.
Paul Beckwith explains the unprecedented brought to his attention by Robert Scribbler: Wrecked Jet Stream Now Runs From Pole-to-Pole. post 
Beckwith and Scribbler both show images from the online visualization by developer Cameron Beccario. site
See Earth Visualized
Prevention of mixing of air between Hemispheres by the thick, hot tropical air mass is what has generated a strong division between Summer and Winter during the Holocene Climate Epoch. However, erode that boundary and you get more Summer heat spilling over into the Winter zone and vice versa. And that’s a kind of weather weirding that we are not at all really prepared to deal with.