Thanks for your updates 'didjman'. We may have quite a way to go yet..
The 2002 polar vortex split was a spring event in september. The build up in August.
We have been monitoring these temp' anomalies much earlier.
Here is a documentation of the 2002 event
Its a little hard but useful
Some research on the 2002 event
The Splitting of the Stratospheric Polar Vortex in the Southern Hemisphere, September 2002: Dynamical Evolution
Andrew J. Charlton, Alan O’Neill, William A. Lahoz, and Paul BerrisfordDepartment of Meteorology, University of Reading, Reading, United Kingdom
https://journals.ametsoc.org/doi/full/1 ... JAS-3318.1