YMLADRIS:
Jet stream: Is climate change causing more ‘blocking’ weather events? | Carbon Brief https://www.carbonbrief.org/jet-stream-is-climate-change-causing-more-blocking-weather-events“[Blocking] tends to be less persistent in the southern hemisphere as the westerly jets are stronger. Despite this, they do have some important impacts, such as over Australia, New Zealand and southern South America.”
For example, blocking events were behind the record hot, dry weather that saw devastating bushfires during Australia’s 2019-20 summer, and a major drought in southeastern Brazil in 2014-15.
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Southern Hemisphere Atmospheric Blocking in CMIP5 and Future Changes in the Australia-New Zealand Sector
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GL083264Climate models often do not simulate enough blocking events, though most research on this problem has focused on the Northern Hemisphere and less is known about the Southern Hemisphere. We survey 23 climate models and show that during winter some models simulate too many blocking events, while others simulate too few, whereas during summer, almost all models simulate too few events to the south of Australia. We also show that with higher concentrations of greenhouse gases we expect there to be less blocking, particularly to the south of Australia and over New Zealand during winter.