Get ready for a lot of rain this week.
Get ready for a lot of rain this week. Brenda Strong

‘Month’s rain in just a few days’

ONE of the hottest November months in Australia's history is about to come to a screeching halt with warnings of a "major rain and flood event" sweeping through the country's east.

More than 100mm of rain could fall in a band encompassing capitals from Brisbane all the way down to Hobart with meteorologists forecasting of a "month's worth of rain in just a few days for some regions".

Almost 30mm has fallen in Brisbane on Wednesday and a severe weather warning for thunderstorms is in place for much of the state's coast. In some areas 200mm of rain could wash down in the next few days, almost certain to lead to flooding.

But that's later this week - first we've got to get through an absolutely scorching few last days of spring.

Adelaide CBD reached a whopping 39.4C on Wednesday, its hottest day since March.

Shane Warne was suffering under the South Australian heat, tweeting on Wednesday morning it was already past 30C at 9am.

Melbourne's 35.8C on Wednesday (the same is expected on Thursday) would be the city's warmest day since last summer. Hobart will get to 33C on Thursday, which will be the hottest day in the Tasmanian capital for two years.

"This is a huge week of weather," Sky News meteorologist Tom Saunders said.

"Before the rain arrives, southeast Australia is ending one of the hottest Novembers on record with another spell of extreme heat."

Mr Saunders said the unprecedented heat had been due to a blocking high over New Zealand which could be the result of weak La Nina conditions forming over the Pacific.

Last week, the Bureau of Meteorology said it was likely a La Nina weather system would indeed form, but it would not be as strong as previous years.

Then, as December hits, temperatures will plummet as the heavens open.

"South east Australia can expect a major rain and flood event later this week," Mr Saunders said.

The forecast is based on the likely outcome of what's expected to be a weather battle royal.

Very warm and humid northerly air that has drifted over southeast Australia, bringing the current heat, looks like it will clash with cold air moving north from the Southern Ocean.

"Warm air colliding with cold air is a volatile mix and will lead to the formation of a deep and complex low pressure system over southeast Australia on Friday," Mr Saunders said.

"The low will remain in the vicinity of southeast Australia until early next week and lead to well over a month's worth of rain in just a few days for some regions," he said.

Between Thursday and next Wednesday, Brisbane could get smashed with more than 100mm of rain, only slightly below the December average of 128.4mm.

Umbrellas at the ready Melbourne and Canberra, you could see anything from 50-100mm of rain where between 50-60mm in the entire month is more usual.

A sodden Sydney and Hobart look like they will receive 50mm in a week, close to the month's average. Even Adelaide's relatively modest prediction of between 25-50mm would still be a month's rain in a week.

"The rain will lead to both flash flooding and river flooding with northeast Victoria most at risk where up to around 200m is possible from this event," Mr Saunders said.




An incredibly hot 38C on Wednesday, dipping to 31C on Thursday and then a big drop to 21C on Friday. The end of the week could see the biggest rainfalls.


It will reach 35C on Thursday with the heavens due to open on Friday with up to 25mm in just one day. Expect a high of 26C as Melbourne heads into the weekend but that will plummet to just 20C on Sunday as the rain continues.


This has been the hottest November in Hobart since records began. Tasmania's hot run continues until Thursday when the mercury will peak at 33C. Friday will then see the mercury drop by 10C to 23C with up to 25mm of rain. Possible rain throughout the weekend with highs of around 17C.


A high of 30C on Thursday dipping only a touch to 29C on Friday with storms a possibility. But it's Saturday that's going to be really wet. Up to 60mm of rain could fall with the dial getting to 23C. Temperatures will then continue to drop further with further rain into next week.


Unlike further south, temperatures will remain relatively stable in Sydney with 27-29C throughout the weekend. The sun will remain up to the weekend and then the clouds will come with up to 20mm of rain falling on Saturday and storms next week.


It's already raining in Queensland. The rest of the week and weekend will see temperatures of around 29C with rain possibly every day. Up to 25mm could fall on a stormy Monday.


34-35C across the Top End with sunshine and storms but rainfall below the other capitals.


Never one to play the east coast's game, Perth will be a model of summertime weather this weekend. Clear skies every day, temperatures will rise from a mild 25C on Thursday to 36C on Sunday.

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