'Bitterly cold' weather system brewing after NSW and Victoria blasted by severe storms - 9News

The "dynamic" low pressure system that hammered Queensland, NSW and Victoria is heading south towards Tasmania - but forecasters are now warning of another weather event brewing in Antarctica.

Weatherzone said the south eastern states will be hit with a "bitterly cold polar blast," which will set temperatures plummeting. It will bring a combination of strong winds, showers and potentially even small hail - just in time for Melbourne Cup.

"It's going to be a very chilly and occasionally wet week, with temperatures five to six degrees colder than average for the time of year, much more typical of August," Weatherzone meteorologist Brett Dutschke said.

This image shows the 500 hPa temperature at 11am AEDT on Tuesday, according to the ECMWF-HRES model. (Weatherzone / ECMWF-HRES)

The warning comes after Melbourne's north-west was smashed by an isolated weather event last night.

Heavy rain, lasting about two hours, caused flash flooding across Lilydale, a suburb 50km from Melbourne CBD.

The system resulted in about 200 calls for help and 11 flood rescues.

Local "Aaron" said he's never seen anything that rivals the flash flooding event. 

"It was close to a war zone, honestly. It was mess everywhere," he told Today.

"Things floating around and debris everywhere. It was a big mess really.

"We've been here close to 20 years and nothing like this at all. It's unprecedented really."

The State Emergency Service (SES) in the Melbourne suburb of Lilydale received more than 130 requests for assistance within an hour on Tuesday night. (Victoria State Emergency Service)

Similar scenes played out in the NSW town of Cooma after a thunderstorm passed through.

Homes were isolated and roads closed as the town filled with shin-deep water.

According to reports this is starting to recede. 

Flash flooding is seen outside NSW SES' Cooma-Monaro Unit after a thunderstorm passed through. (NSW SES)

The low pressure system responsible for the wild weather is now tracking south through Victoria and into Tasmania, and is said to be "deepening".

The system will cause wind and rain to increase over Tasmania during the next 48 hours.

"Some areas in the state's east could see 100 to 200 mm of rain during the next 2 to 3 days," Weatherzone said.

"A flood watch is also in place for the state's North, North East, Derwent and South East Catchments."

Forecast accumulated rain during the 72 hours ending at 11pm AEDT on Thursday, October 27. (Weatherzone)

Residents in Victoria can expect to see more showers over the next few day before the system starts to dissipate.

However there is an end to the wet weather in sight, with the Bureau of Meteorology (BoM) confirming La Nina will weaken in early 2023, with the Indian Ocean Dipole "rapidly decaying" in late Spring.

The forecast comes as widespread flooding continues across NSW and Victoria.

Prime Minister Anthony Albanese said on Tuesday that 25,000 Australians have received Commonwealth relief funding linked to the latest deluge.

In NSW, 107 flood warnings are current across the state - as of 6am - with 77 for Victoria.

Of these, 20 and 6, are at emergency level respectively. 

Local wildlife left stranded by rising floodwaters

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2022-10-25 19:25:10Z
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