A uncommon climate phenomenon is growing off the West Australian coast as two brewing cyclones look set to work together this week.

Tropical Cyclone Seroja, at the moment sitting a number of hundred kilometres north-west of Broome, was named earlier this week and is monitoring south-west over open waters.

In the meantime, a second tropical low has now fashioned close by, anticipated to strengthen to cyclone depth as early as tomorrow. 

With the 2 techniques on path to work together with one another, a phenomenon referred to as the Fujiwhara Impact will doubtless happen, inflicting them to rotate round one another.


Bureau of Meteorology (BOM) tropical cyclone forecaster Craig Earl-Spurr described the complicated interplay as just like a “dance” between the 2 techniques, not often seen in Australia.

“As a result of each are attempting to throw one another round their very own wind fields, as each strikes the wind area strikes with it,” he stated.

“So relying on how that then pushes the opposite [system] round, little modifications can change into huge modifications in a short time.”

What is going to the impacts be for WA?

Mr Earl-Spurr stated at this stage, the techniques have been anticipated to stay “far sufficient offshore” that there could be little affect from both on the WA coast. 

A wind map showing two looming cyclones off WA.
The 2 climate techniques off the WA coast look set to rotate round each other later this week.(

Equipped: Earth Wind Map


However he stated the “tug of struggle” between the 2 techniques made predicting cyclone tracks tough, and it may change in a short time.

“They’ll take a full 90-degree flip once they first begin to work together with one another,” he stated.

“After which as they transfer round one another at some stage, they’re going to separate once more, most certainly as soon as one in every of them’s weakened, and understanding when that is going to happen is a very robust factor to foretell.”

showing the forecast path of Tropical Cyclone Seroja off WA's north coast.
Cyclone Seroja is heading south-west however may method the WA coast nearer to the weekend.(

Equipped: BOM


The monitoring map for TC Seroja at the moment has it shifting south-west throughout the subsequent few days over open waters, avoiding crossing the coast. 

However there’s the chance the cyclone may method the far west Pilbara or Gascoyne coast in the direction of the weekend.

Will they merge to type a mega-cyclone? 

The excellent news is their interplay means it’s extra doubtless their observe can be impacted moderately than their depth.

“It is unlikely that one in every of them would change into considerably stronger by means of the interplay,” Mr Earl-Spurr stated. 

“They might intensify afterwards, as soon as they’re type of not interacting with one another.”

There’s additionally a 3rd tropical low at the moment to the far west over the Indian Ocean, however Mr Earl-Spurr stated this was unlikely so as to add to the interplay at this stage.

The climate phenomenon was named after Japanese meteorologist Sakuhei Fujiwhara, who initially described it in 1921.



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