New South Wales and Queensland will experience another weekend of 'torrential' rains as dangerous flash floods are likely to hit areas already inundated.
The nowcast came as the Bureau of Meteorology released its summer forecast on Thursday, predicting high rainfall in eastern, northern and central Australia through 'in February, with Queensland to support the weight of the rain.
BoM meteorologist Dean Narramore said heavy rains were expected to sweep through western and southern New South Wales later Thursday before moving into south-eastern New South Wales -South Wales on Friday.
"Sev Before thunderstorms are expected in the coming daysbears and piles of rivers are already experiencing flooding, "Narramore said.
" Hail can occur inland, but the main risk is very, very heavy precipitation resulting in dangerous flash floods and destructive winds. Other rivers are likely to be inundated.
"It will be a few rainy and stormy days.
Severe thunderstorm warnings were in place across Victoria, NSW, Queensland and parts of the Northern Territory on Thursday, as there were more than a dozen warnings flooding in place across NSW and Queensland.
Several rivers in NSW including the Lachlan was already flooded because of previo us storms . Dams across the state were at 94% of total storage capacity , an increase of 0.4% from the previous week.
The dam of Burrendong was at 126.4% capacity, while Menindee Lakes had a total storage capacity of 110.8%.
"We could see that " 'they were really hit by heavy rainfall… and many other rivers could see minor to moderate water. floods, ”Narramore said.
Isolated showersand thunderstorms are expected to spread from Darwin in the north to east to Victoria in the south in the coming days, affecting about a third of the nation.
"This is not data a massive swath of heavy rain everyone is going to have, but most of eastern parts of Queensland, NSW and Victoria will experience showers and thunderstorms,” Narramore said.
Maximum precipitation was expected to occur on Friday, with isolated heavy falls of over 100mm forecast for the eastern parts of Queensland and New South Wales.
Bundaberg, south of Gladstone already saw 122mm of rain on Thursday, and more are underway before a possible slackening by the weekend.
The extensive eastern regions of Australia received between 20 and 50mm of rain Thursday afternoon.
Sydney and Brisbane are expected to receive between 50 and 100 mm of rain over the next three days, while Melbourne is expected to pass largely by downpour. Parts of eastern Victoria were likely to receive between 25 and 50mm of rain.
"This is good news if you don 't don't want it "said Narramore. “Melbourne will only have occasional light showers and drizzle.
The most severe storms are expected to subside by the weekend, with some showers crossing New South Wales and Queensland .
Narramore said if you don 't like wet and sticky weather you are out of luck because there is "a lot more coming "in the following weeks and months.
" Nothing in the weather is constant, but it will be wet and stormy across Sydney and Breakingbane and there isn't a long stretch of sun on the path yet, "he said.
This year's spring was probably wettest since 2016, while this month was expected to be among the wettest November 10ths on record for New South Wales and South Australia.
Higher than average precipitation was expected to continue throughout the summer as La Nina in the Pacific Ocean combines with the positive Southern Ring Mode (SAM).
La Nina was officially declared by the BoM on Tuesday, after weeks of wild weather in the east of the country.
The Chief of the office's operational climate services, Dr Andrew Watkins, said warmer waters in the west coupled with increased humidity was likely to create humid conditions for parts of eastern Australia approachingof summer.
"La Nina… is now established in the Pacific Ocean for the second year in a row " he said. declared.
"December is likely to see our typical summer weather systems pushed further south than normal, which means more humid air from the Tasman Sea, and New South Wales and eastern Victoria.
"Spring has been wetter than normal and, as a result, soil moisture is high, water supplies are full and we have seen flooding in some areas. Any additional rain on our already wet landscape will increase the risk of flooding for the country. east of Australia this summer. "
But despite the heavy rainfall, temperatures are also expected to be warmer than thehas averaged over most of Australia this summer, with the exception of the southeast.
Minimum temperatures are also expected to be above average , although below average daytime temperatures are expected for eastern New South Wales.
There has been no strong variation towards wetter or drier conditions in South Australia, while parts of Australia West were likely to experience above or slightly above average precipitation.
Although there was below average fire potential in many forested areas of New South Wales and eastern Victoria, Watkins said the strong growth of grass and crops in the spring can dry out during the summer, increasing the risk of 'fire.