Weather News

Wild weather forecast as eastern states prepare for first taste of summer storms

Thursday September 30, 2021 - 08:12 EST

It is set to be a wild end to the week as potentially severe storms and widespread, heavy rainfall descends upon eastern Australia.

According to Miriam Bradbury, meteorologist at the Bureau of Meteorology, the main risk of thunderstorms will be on Wednesday and Thursday and reach from southern Queensland through New South Wales and into northern Victoria.

"These severe storms are possibly going to bring us some large hail, damaging wind gusts, and also the heavy rainfall which could lead to flash flooding," she said. 

"They may even persist into Friday as they contract towards the east coast."

[Click through to share your videos and photos of the wild weather]Even if you avoid the storms you could still get heavy rain.

"The rainfall, even outside of the storms, could be fairly significant for areas like north-east Tasmania which can expect quite a bit of rainfall coming through around the end part of the week," Ms Bradbury said.  

"We might see a few minor flood warnings cropping up towards the end of the week across parts of Tasmania, Victoria, and New South Wales." 

What is causing it? 

A low pressure system is set to cross into South Australia on Tuesday before moving into eastern Australia over the middle and later part of the week.

The low is linking in with a trough that extends all the way up into northern Australia where it is tapping into moist tropical air and dragging it down. 

"So that means these showers and storms have the potential to bring a lot more rainfall than they usually would if they didn't have that link to the tropics," she said.

Because of this tropical air, temperatures are not expected to drop like they do when a winter frontal system makes its way through. 

Maximum temperatures are forecast to be close to or above average for eastern states on Tuesday, Wednesday, and Thursday.

"We won't really start to see some cooler weather until Friday when that system starts to move offshore and some of the cooler air finally starts to sneak in," Ms Bradbury said.

Welcome to severe weather season

This system is bringing more summer-style storms than the fronts we have been used to over the past few months. 

According to Ms Bradbury this is a pretty common synoptic setup for thunderstorm days across Queensland and New South Wales, which can sometimes push down into Victoria.  

"What makes this event noteworthy is that it is spanning right across multiple states and it is expected to persist for multiple days," she said.

"It's also the first one like this that we're seeing this severe weather season."

Meanwhile, things are getting steamy up north.

"The Top End is having its own fun. They're going to see a return of some pretty moist air which means some pretty humid conditions returning this week," Ms Bradbury said.

There is the chance of a few showers or storms around Darwin, but mostly just oppressive tropical warmth.

More fronts for the west 

While the east is getting summery storms, the west is still very much in winter mode as a series of fronts make their way through this week. 

There is a trough approaching WA on Wednesday, but Ms Bradbury said it is going to be followed by a more substantial front on Friday. 

Tuesday was not expected to be too wet in the south-west. Wednesday, Thursday, and Friday are expected to be showery with the risk of storms. 

Temperatures are expected to be above average before the fronts, "but by the time Friday rolls around with that cold front the temperatures will be shifting below average again. So some cooler air moving in for the weekend," Ms Bradbury said..

As usual folks, keep up to date with the warnings and keep your wits about you when venturing out this week.


© ABC 2021

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