MJO again.
The Madden-Julian oscillation is one reason cyclones are steering clear of WA in 2019
The MJO is an eastward-moving pulse of cloud and rainfall that travels around the planet close to the equator, returning to its initial starting point every 30 to 60 days on average.
The MJO is expected back in the Australian region in the next fortnight.
https://www.abc.net.au/news/2019-03...lation-causing-wa-cyclones-to-vanish/10855032
The Rossby wave, which moves from the east to the west.
https://www.abc.net.au/news/2018-02-16/rossby-wave-phenomenon-fuels-tropical-cyclone-kelvin/9451796
Though not a necessity the MJO timing and Rossby Waves need to factor in.
