Weather News

Tropical Cyclone forms to the north of WA

Joel Pippard, Monday April 5, 2021 - 13:33 EST

Tropical Cyclone Seroja has formed near the Timor Island north of Western Australia and will intensify as it tracks towards the west coast during the week.

In the early hours of Monday morning, Seroja formed in the Indonesia region near Australia. As of 9am WST, Seroja was producing winds up to 100km/h and was slow-moving to the west.

Image: Satellite image of the newly formed tropical cyclone Seroja

Later on Monday, Seroja will start to move in a southwesterly direction and into the Australian region of responsibility. It will then start its slow and steady increase in strength as it moves roughly parallel to the WA north coast during the week. This system is a high chance to become at least a category 3 severe tropical cyclone by Wednesday, possibly becoming a category 4 later on.

For most of the north coast, rough seas and somewhat gusty winds will be the worst of the weather experienced during the next few days, depending exactly how far the system is from the coast.

However, from about Thursday or Friday, Seroja will start to interact with another tropical low or cyclone coming from near Christmas Island, with its track becoming very uncertain as a result.

Image: Forecast wind gusts on Thursday night, showing the two tropical lows/cyclone interacting with one-another. 

This system of both tropical cyclones could impact the Pilbara and Gascoyne coasts, producing winds in excess of 120km/h, heavy rainfall of more than 200mm and rough seas leading to some coastal inundation. At this stage though, which areas of the coast will be hardest hit, or if the systems will even make landfall, are very uncertain.

With the track being so uncertain and the possibility of dangerous weather conditions, keep up to date with the latest track here and the latest warnings here.

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