For New Zealand, early August will come with a steady diet of chilly air masses from the Southern Ocean 🐧 A weakened polar vortex and polar jet stream will see some Antarctic air push across the Southern Hemisphere. Also, the sub-tropical jet stream is forecast to remain north of New Zealand. The Southern Annular Mode, a key climate driver in the Southern Hemisphere, recently dipped to its lowest July value since 2011. This is a nod to the impact that the minor sudden stratospheric warming even