I used to fly quite often to Perth .
Sometimes, at 01:30 in the morning clear sky, always there was Moderate Turbulence to Severe beginning at 5.000 agl.
Northerly winds up to 60 KIAS, gradually decreasing as we loosed altitude near to Rwy 21.
I had my worst severe turbulence and associated wind shear in my life during an approach to Rwy 03 in a crystal clear night.
We did a Go-Around, and passing 3.000 feet, it was smooth and nice again.
Next attempt we landed on Rwy 06, with serious turbulence on final below 3.000 feet.
I think they closed the Rwy that night after our landing.
I never ever found nice and smooth conditions flying through Bay of Bengal, because there are always huge CB’s, especially during Moonsoon season.
And since communications with Colombo and Calcutta remain on HF made our lives miserable every time we needed to deviate.
However, I have found that flying over China on winter, one can find some rough atmosphere sometimes.
I think that it is my Karma.
Mercurius