Tropo Duct 10/11 July '23 - 144 MHz WSPR

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A somewhat unexpected Tropospheric Ducting opening overnight and still ongoing now in south east Australia on 2m WSPR (and moving to SSB voice QSO in some cases) with distances extending as far as 1421 km east west from Sydney to Port Lincoln.
Pretty dicey looking on Hepburn charts but there is some weak colour around but not really so much on the longer paths.
The MSLP map shows a great large high pressure weather system with cold fronts pushed far enough away to the south.
From discussion with others it seems this duct is quite elevated and rather unusual, its rare for this event happen from Sydney to Port Lincoln. Having said that, the guys using WSPR are finding these paths available potentially more often than one would think.
Being the middle of winter we expect the tropo may last all day and wait in anticipation to see what may occur this evening after sundown.