
29 Nov RARE Tropical Cyclone to develop in Australian Waters
Issued Wednesday, November 29th 2017. It looks like a rare event is expected to take place in order to give Australia its first cyclone for Season 2017-18. Above image via WindyTV showing the Fujiwhara effect which is being forecast for Friday.
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Tropical Cyclone Cempaka (soon to be Ex-TC Cempaka) and Invest 96S are currently situated over Indonesian waters North-East and North-West of Christmas Island respectively. These storms are expected to linger over this region for the next 24hrs before drifting into Ausrtalian waters later on Thursday. Its during this time, and across Friday, that the 2 systems are expected to near each day and enter what is called the Fujiwhara effect.
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The simplest way of explaining the Fujiwhara effect is an effect or occurrence named by Sakuhei Fujiwhara (a meteorologist in Japan who discovered the occurrence) where 2 low pressure regions or cyclones near each other, close the gap between each other and the orbit around each other. The two systems will orbit around a centre point which is approximately half way between the 2 centres of the 2 systems in a clockwise direction. The larger or stronger system of the 2 will dominate the interaction and become the parent low / cyclone.. causing the other to weaken or become part of the stronger systems overall rotation.

Fujiwhara effect and how the systems interact with each other
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