Every state and territory hit with brutal forecast as two weather systems combine

The announcement comes as Australians along the east coast are warned to prepare for another potential La Niña cycle.

A graph showing locations across the country where the rain is likely to pour, inset over an image of people donning umbrellas in Sydney in wet weather.
Up to 80 per cent of country is about to be lashed by a dumping of rain. Source: BOM/Getty

Australians living in virtually every jurisdiction in the country are set to cop a drenching this week, with up to 80 per cent of the nation expected to be lashed by a massive a downpour starting from today.

Meteorologists say two systems combined will soak between 70 to 80 per cent of Australia in the coming days, with some parts of the country potentially set to "see rain every day this week", according to Weatherzone.

The weather authority said this week’s "wet and stormy weather" will mainly target WA from Monday to Wednesday, before heading across central and southern Australia on Thursday, with conditions then due to move east from Friday and into the weekend.

People donning umbrellas in Sydney in wet weather.
Virtually every region in the country is expected to see some rainfall within the next week. Source: Getty

Meteorologist Mirian Bradbury from the Bureau of Meteorology (BOM) said that as the rain front moves to the WA border from the west coast, it will likely tap into tropical moisture from the Indian Ocean, Bradbury said.

"That’s going to give fuel to any showers or possible showers that develop along this front line." Gusty winds could accompany the front and Bradbury warned the Victorian Alps and southern Alpine region of NSW could see some "damaging winds".

Across Perth, BOM forecasts rainfall totals of between about 15mm to possibly 50mm from Tuesday to Thursday. Adelaide could receive between 8mm and 25mm across Thursday and Friday.

Melbourne could see between 2mm and 18mm on Thursday and Friday while Sydney could receive between 1mm to 40mm across Friday and into the weekend. But the rain won’t end there, with Weatherzone and BOM both predicting a second rain-bearing system to bring more rain to WA from Saturday or Sunday.

The rainfall front will deliver wet weather to parts of Australia that have so far suffered a rainfall “deficit” this year, Bradbury said, including Perth and Adelaide.

Intense rain systems such as this one have largely been prevented over the few months by "stubborn high pressure systems" sitting near southern Australia.

However with that blocking high pressure pattern "finally breaking down this week", Aussies are set to see the first "northwest cloudband" of the season and some "decent rain in every state and territory", Weatherzone said.

The damp outlook comes as people are warned to brace for yet another La Nina cycle that could emerge within months, which would make the fifth consecutive year of either La Niña or El Nino in Australia.

In it’s latest climate driver update, the bureau said there are signs the weather system could form over the Pacific Ocean in late 2024. It comes less than six months after the El Nino system wrapped, and if a La Nina was declared it would be the first time ever Australia has recorded five consecutive years of La Nina and El Nino.

- With NCA NewsWire

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