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But then again, it was very early in the morning before much of the thermals and turbulence as a result of the ground heating up could take effect.
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While this is certainly a factor, at this time of year the worst turbulence on approach is usually associated with strong easterly winds in the early mornings, which settle down by mid morning. Tomorrow's forecast is a good example of that. It is also not unusual to have winds at a few hundred feet that are quite different from the surface wind, and quite variable too.
Its quite an interesting phenomenon, and Perth's winds always keep any pilot on their toes.