If you are into weather-watching as most of us are to some degree, a question is _why will it turn 135 deg to head west_ ?
Look at the world pressure maps...
zoom.earth/maps/pressure/#view=-28.3,151.9,4z/model=iconThere are two slow moving high-pressures in the Tasman Sea, the net effect will stop the southern movement in it tracks.
There isn't any real high-pressure over the centre of Australia, while there is a big high-pressure over northern New Zealand. Basically it will be sucked-westward and pushed-westward.
... that is my amateur's interpretation.