Australia's weather will be a tale of two halves this week, with cool, wet conditions coming for the south and warmer days for the east and north.
Weatherzone says the weather in much of the country will be affected by a developing negative southern annular mode (SAM).
"A negative SAM is associated with a northward shift in the belt of westerly winds that flows between Australia and Antarctica," Weatherzone said.
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"During spring, a negative SAM pattern typically causes cold fronts and low pressure to deliver more rain in southern Australia, while high pressure systems centred further north cause drier and warmer weather across much of northern and eastern Australia."
The differences can be seen in the forecasts for Australia's capitals.
Sydney and Brisbane are set to see mostly warm and sunny weather for the coming week, according to the Bureau of Meteorology, though Sydney will cool from the high 20s to mid 20s later in the week.
Brisbane is forecast to crack the 30-degree mark on most days, peaking at 35 on Thursday.
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By contrast, Melbourne and Adelaide are facing frequent rainy days with top temperatures unlikely to pass 20 degrees before the weekend.
"Northern Australia will see heat building up under this week's weather pattern, with temperatures likely to reach the low forties in parts of the Kimberley, Pilbara and Top End," Weatherzone said.
"This won't be the first time temperatures have exceeded 40 degrees in Australia this spring, but it has a good chance of being the country's hottest weather so far this season."
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