Huge downpour to hit parts of Australia with 'five months' worth of rain'

·5-min read

Parts of Australia could see months worth of rain falling in the coming days, thanks to the remnants of Tropical Cyclone Tiffany.

While the former cyclone will be drawing in moisture to parts of NSW and Queensland, it's the middle part of Australia which is going to get drenched.

Senior meteorologist at the Bureau of Meteorology Jackson Browne told Yahoo News Australia the Northern Territory and South Australia will see the brunt of the deluge over the coming days.

"Essentially the middle of the country can expect pretty large rainfall totals. These are affecting areas in outback South Australia, far western Queensland and an eastern Northern Territory," he said.

These areas could see rainfall of around 100 to 150 millimetres, he said, adding there is a weather system developing over the Nullarbor Plain in the next couple of days.

A map of Australia shows the entire Northern Territory and big patches of South Australia are due to for a downpour this weekend
The Northern Territory and South Australia are set for a downpour this weekend. Source: BOM

From Friday through to Sunday, the eastern two-thirds of South Australia can expect rain, Mr Browne said.

He added that parts of South Australia have low monthly averages, so some regions could see record amounts of rain.

"We're talking on the order of four to five months' worth of rain if they do get this 150 millimetres in places," he said.

The weather system will likely impact the Eyre Peninsula on Friday and then potentially Adelaide and the lower south-east of the state over the weekend.

"The Nullarbor Plain is pretty much where the desert meets the sea, with very arid areas, so the falls are on the order of about 50 to 100 millimetres with isolated falls of up to 120 millimetres," Mr Browne said.

"A flood watch has been issued in anticipation of that forecast rainfall. It will likely impact people in that area."

Darwin can expect thunderstorms right through until early next week.

Rainfall in the southwestern parts of the top end have been seasonally high, the Bureau said in a flood watch warning.

Pictured is the map of Australia - showing where all expected thunderstorms are likely over the weekend - mainly in the Northern Territory, and parts of Queensland and South Australia
Thunderstorms are expected through the Northern Territory and South Australia in the coming days and through the weekend. Source: Windy

"Widespread rainfall has eased but thunderstorms may produce isolated heavy falls for the next few days," the Bureau said.

"Rainfall over the last few days and areas of flooding may adversely affect road conditions and some communities and homesteads may become isolated."

Multiple days of rainfall in NSW and Queensland

The remnants of ex-Tropical Cyclone Tiffany have made its way to northeast parts of NSW and while Mr Browne said rain in the last 24 hours has been muted, there is more to come.

Parts of the east coast in NSW received more than 70 millimetres and about 70 to 80 millimetres in Queensland.

"Multiple days of heavy rainfall, with some severe thunderstorms will be something to watch, however, by Friday we should see cessation of most of that activity," he said.

Then, the "interest in emphasis" will be switched back to the middle of Australia.

The coming days will be humid for much of the east coast, with nothing in the air to bring about some relief.

"It will be quite humid over eastern Australia so capital such as Brisbane, Sydney, Canberra, it will be quite humid and muggy," Mr Browne said.

"There's really no support in the atmosphere for any weather systems to bring about any big change."

Pictured is rain in Sydney's CBD in 2021.
Rain is expected to ease by the weekend in NSW. Source: AAP

From Wednesday to Friday, the Bureau has forecast a high of 25C to 26C in Sydney, with the warm weather lingering as the sun comes out on Saturday.

There's a medium chance of showers in Sydney on Saturday with a possible shower on Sunday.

Canberra will seemingly be spared from the rain, but will have slightly cooler temperatures leading up to the weekend, with a top of 27C on Sunday.

Meanwhile Brisbane can expect showers right through the weekend, according to the Bureau, with temperatures in the high 20s to 30s.

Though, "rainfall deficient" areas in southwest Queensland and western Queensland can look forward to a bit of rain in the coming days.

On Wednesday in just one hour, Eversfield in western Queensland, copped 71 millimetres of rain and the Bureau issued a severe thunderstorm warning for the Maranoa and Warrego Forecast District.

"Severe thunderstorms are likely to produce heavy rainfall that may lead to flash flooding and damaging winds in the warning area over the next several hours," the warning said.

"Locations which may be affected include Mitchell."

Sunny for the rest of Australia

Melbourne will be mostly sunny until the weekend and will then swelter through 35C heat on Sunday.

In fact, it's going to be mostly sunny across Victoria until after the weekend, though there is a current warning for damaging winds in central and southern ranges in Victoria from Wednesday through to Thursday morning.

The easterly winds will be around 50 to 60km/hour, though damaging gusts of up to 90km/hour are possible over the Otway Range.

Pictured is Cottesloe Beach in Perth, Western Australia
Perth is set for a hot week, with no rain forecast. Source: Getty Images

The Bureau is expecting it to be sunny in Perth through to next week, with temperatures in the high 30s for the rest of the week.

Though, parts of the Kimberly can expect rain and thunderstorms starting from Wednesday, paired with high temperatures.

As for Hobart, the next few days looks to be clear from rain, with temperatures in the mid-20s.

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