'Nasty' weather to lash Australia's east for several days: 'Flood risk'

A low-pressure system headed for Australia's east is expected to bring heavy showers and thunderstorms over the coming days, potentially leading to more flooding.

The wild weather will hit South Australia on Tuesday, with the most intense rainfall anticipated to be around 15 to 30mm, Weatherzone meteorologist Yofka Hernandez told Yahoo News Australia.

While rain will be seen over Adelaide, thunderstorms will also be present in the northern parts of South Australia, in places such as Oodnadatta and Moomba.

The weather system is then predicted to extend to southwestern Queensland and northwestern NSW — kicking off several days of thunderstorms and heavy rainfall.

All eastern states should expect significant rainfall and storms, with the widespread dreary weather peaking on Wednesday.

In a statement on Monday afternoon, the Bureau of Meteorology warned there will be moderate to major flooding in already flooded areas in NSW and Victoria, and possibly in Tasmania and southern Queensland.

Rain to lash Australia's east coast

In western Queensland and NSW, there could be 60 to 80mm of rainfall on Wednesday, Ms Hernandez said.

"That's going to be linked to severe thunderstorms as well, over these inland areas with heavy falls," she said.

"And it's possible pockets [of the state] could reach more than 80mm of rain, to probably 120-150 millimetres."

Sydney can expect a few showers and around 2 to 6mm of rain on Wednesday, with showers increasing on Thursday and Friday, before a potential lashing on the weekend.

Saturday is likely going to be the wettest day for NSW's capital, with a chance of 15 to 30mm of rainfall, the BoM predicts.

There's also a 90 per cent chance of rain on Sunday, with 10 to 30 mm of rain expected.

Ms Hernandez warned the Illawarra region, the Southern Tablelands, the Snowy Mountains and Canberra might also cop a fair bit of rain in the coming days, with about 20 to 40mm of precipitation anticipated.

Rain and thunderstorms will plague southwest Queensland on Tuesday and Wednesday. Brisbane and the Gold Coast will likely see some rain from Wednesday through to Sunday.

While storm activity and showers should decrease from Thursday in Queensland, NSW, Victoria and Tasmania, another cold front could reinvigorate a storm on Friday in parts of each state.

The wet weather will also extend down to Victoria. Western parts of the state will see rainfall first. Melbourne should see showers developing by Wednesday, which will continue until Friday.

It should be just partially cloudy in Melbourne on Saturday, however, rain is expected to resume on Sunday.

Renewed flood warning as rain strikes again

With rain and thunderstorms plaguing most of Australia's east, more weather warnings can be expected over the coming days.

Ms Hernandez said the primary concern is flooding, particularly in inland NSW and Queensland.

There are concerns that downfalls in areas — which were previously inundated with rain earlier this year and last month — could see more flooding.

"Widespread rain is expected across eastern Australia this week and for many communities, this does mean an increased flood risk," the Bureau's meteorologist Jonathan How said in an update.

"Not just for those who have recently experienced flooding, but for those currently in flood."

One "small time weather buff" has warned his Facebook followers to "stay safe" and not take any risks over the coming days, saying the upcoming weather will likely be "nasty".

There are several active flood warnings in place for NSW, including a moderate warning for the Namoi River, which peaked at Bugilbone on Saturday.

There are also flood warnings for the Macquarie River, Bogan River, Lachlan River, Murrumbidgee River, Murray and Edward Rivers, Culgoa, Birrie, and Bokhara Rivers, Warrego River (NSW), Paroo River (NSW), Barwon and Darling Rivers and Snowy River.

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Currently, there is just one active flood warning in Queensland for the Bokhara River. In Victoria, there are active flood warnings for the Kiewa River, Loddon River, Snowy River and Avoca River.

With isolated severe thunderstorms across NSW, Queensland and Victoria, there's a chance of damaging hail and winds.

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