Rain, storms for thousands of kilometres across Australia in coming days

A massive rain event stretching thousands of kilometres is set to give half of Australia a soaking today and tomorrow.

The weather system runs from the Northern Territory, through Queensland and down to New South Wales and Victoria – a distance of between 2000 and 3000 kilometres, Weatherzone meteorologist Felix Levesque said.

It even extends out into the Tasman Sea, towards New Zealand.

Flooding in Wallacia in NSW overnight.
Flooding in Wallacia in NSW overnight. (Nine)

Mr Levesque said the heaviest rain would come today and tomorrow, before contracting into isolated pockets on Saturday.

Eastern Queensland is likely to see rain through to the end of the month.

Severe thunderstorms have also been forecast, with emergency crews already having received dozens of calls for help across Sydney.

More wet weather is forecast for Sydney today but is expected to ease into the weekend.

“We’ve seen some very wet conditions across Sydney already, yesterday we saw storms move through and Warragamba received 60 millimetres in just one hour,” Agata Imielska, from the Bureau of Meteorology, said.

Broken Hill has already seen heavy rain overnight.
Broken Hill has already seen heavy rain overnight. (9News)

Ms Imielska said NSW will see severe thunderstorms and widespread rainfall today.

“There is a risk of intense rainfall that can produce flash flooding, damaging winds,” she said.

“The severe thunderstorm risk could bring severe hail which is another concern for the state.”

There is also a concern for renewed flooding in Gunnedah and Forbes, which has been inundated by recent floodwaters.

A severe weather warning is in place for south-western NSW with severe thunderstorms and rainfall expected today.

Forbes residents are barricading their homes and businesses with sandbags as they prepare for an evacuation order amid rising floodwaters.

How residents of NSW town are preparing for major flooding

In Queensland, a deluge of heavy rainfall is set to hit Townsville, Georgetown, Springsure, Einasleigh and Rollingstone.

A major flood warning remains in place for the lower Macintyre River and Weir River.

It comes after the state was hit with the heaviest November rainfall in decades.

The Bureau of Meteorology (BoM) said 121 millimetres of rain fell in Brisbane in the past 24 hours.

The BoM declared a La Niña has developed in the Pacific Ocean, leading to wetter than normal periods for eastern, northern and central parts of the nation.

La Niña often brings above-average rainfall, cloud cover and cooler temperatures.

The state is also likely to have rainfall in the morning or afternoon, with temperatures reaching a cooler 17C.

Perth is set to have a sunny day with temperatures at a high of 32C.

Adelaide is forecast to have a partly cloudy day with a slight chance of rain.

Temperatures are expected to reach around 22C.

Australian Capital Territory

Heavy rain and thunderstorms that may lead to flash flooding are set to hit the country’s capital.

A possible thunderstorm with heavy rainfall is forecast for the territory.

It’s expected to arrive in the afternoon or evening.

Hobart is set to have a partly cloudy day with a possible chance of showers in the afternoon or early evening.

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