Sydney has been smashed by a 'very harmful' storm that is seen a preferred Westfield evacuated after the roof collapsed.
A twister warning has additionally been issued for Sydney and surrounding areas because the wild climate lashed Australia's east coast.
Within the midst of the chaos, NSW Fireplace and Rescue are speeding to save lots of three individuals trapped in floodwaters at Merrylands in Western Sydney.
The Bureau of Meteorology issued the pressing climate warning to 'individuals in components of the Blue Mountains/Hawkesbury, Larger Newcastle, Gosford, Wyong, Sydney and Larger Wollongong areas,' on Thursday afternoon.
Damaging winds, massive hailstones and heavy rain have battered western with Penrith and Blacktown copping bearing the brunt of the system.
Stunning video uploaded to social media exhibits water pouring from the the ceiling of Mt Druitt Westfield as consumers rush for the exits.
NSW Fireplace and Rescue stated they have been referred to as to the scene simply after 4.00pm.
"The rain water seemed to have pooled above the store and the ceiling collapsed,' the SES said.
'Everyone inside has been evacuated and there were no injuries.
'They are still investigating, including whether others stores might be at risk.'
Senior meteorologist Jordan Notara told 2GB radio on Thursday afternoon it's a 'dangerous situation.'
'We've had quite an escalating storm situation within Sydney metropolitan area. As of around a half an hour ago, we have seen rotation within a thunderstorm which is moving through.'
'We haven't as yet had any observations on the ground but the signatures that we are seeing on the radar are indicative of something that will produce damaging ... wind gusts, large giant hail, again, quite a dangerous situation.'
NSW Fire and Rescue said a daring rescue operation is underway to save three people stranded in rising waters at an intersection where Military Road crosses Guildford Road in Merrylands.
Fire crews told Daily Mail Australia 'two trucks and one senior fire officer are on the way to undertake the flood water rescue.'
The low pressure system is expected to move down the coast in the next 24 hours with weather warnings issued for residents from Queensland to Victoria.
NSW residents as far inland as Goulburn and Orange in the central west could feel the brunt of mother nature from Thursday night.
The ACT can be forecast to expertise comparable moist La Niña circumstances because the wild climate system intensifies.
Queensland's south east has already been battered by rain and lightning since the early hours on Thursday morning.
Melbourne metro and areas throughout Victoria are experiencing some moist climate circumstances because the low strain system brings rain for the remainder of the week.
Meteorologist Jonathan Howe said conditions were making it possible for tornadoes to form in south-east Queensland.
'Today, the ingredients for a tornado really do line up. We cannot predict where they are going to form but the environment is there to see these super events,' he told the Today show.
'The advice is keep an eye on any of the advice is keep an eye on any of the warnings because when they do crop up they cause a lot of problems.'
The Bureau of Meteorology's David Wilke said thunderstorms forming yesterday will turn into full-blown monster storms on Thursday.
'We're going to see a cold front moving through NSW ... it's going to bring pretty widespread areas of showers and storms and some reasonable rain through the southern part of the state,' he said on Wednesday.
Hail the size of tennis balls are also forecast for parts of these areas, as well as regions around Goulburn, Orange and Port Macquarie in NSW.
Queensland's south east is already experiencing torrential rain and flash flooding alerts have been issued after a massive thunderstorm struck this morning.
A severe thunderstorm warning is in place for Brisbane and Moreton Bay.
Brisbane, the Gold Coast and Toowoomba have been pelted by torrential rain and lightning since the early hours of Thursday morning, with over 50mm falling in one hour at Dalby on the Darling Downs.
'Dalby copping an absolute monster in the intervening time,' native resident Adam Ogden stated to The Courier Mail.
Thunderstorms are often small area events, which means some communities may experience intense weather activity while locations nearby aren't affected.
Hazards may include damaging winds, heavy rain, and large hail and flash flooding is possible in some locations around the east coast.
Recent rain has left catchments in those areas wet and many dams are near capacity, so there's the potential for more rain to cause rivers to rise and flooding.
These heavier than expected rainfalls are looking more likely during the summer months after the BOM raised its ENSO outlook from a La Niña 'watch' to 'alert' on Tuesday.
Conditions are expected to begin easing after Thursday, but there's still the possibility of thunderstorms on Friday.
SA and Tasmania are feeling the effects of the low pressure system as showers and chilly temperatures are forecast for Adelaide and Hobart in the coming days.
Over in Perth, cloud cover and showers are expected towards the end of the week, with highs reaching the low 30s.
Hobart is also experiencing the wet weather with rain forecast for the rest of the week and temperatures not surpassing 18 degrees.
Whereas remaining heat, Darwin is anticipating showers and doable storms for the rest of the week.
