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Several states are set to sizzle in the coming days as high temperatures hit for the start of November.
Storms are predicted around Queensland's Fraser Coast, Wide Bay and Burnett before the weather system travels further north.
Heat is building across northern Australia, including Alice Springs which is in for days of 40C heat.
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Adelaide could reach 35C today due to heat drifting down from central Australia.
An extreme fire danger is forecast for a range of fire weather districts in South Australia including the West Coast, Eastern Eyre Peninsula, Lower Eyre Peninsula, Flinders, Mid North, Mount Lofty Ranges, Yorke Peninsula, Riverland and Murraylands.
"Hot and dry with fresh to strong north to northwesterly winds ahead of a cool and gusty southwesterly change extending from the west during Saturday afternoon and overnight," the Bureau of Meteorology said.
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The heat is set to move into Sydney tomorrow, when the city could reach the low 30s.
This system will move into south-east Queensland from Monday and most of next week, where temperatures are expected to climb.
It is also the official start of tropical cyclone season in Queensland.
Thunderstorm season kicked off in Queensland's south-east and the NSW mid-north coast yesterday with destructive weather.
Giant hailstones up to eight centimetres in diameter was found through the mid-north coast, Tweed and south-east Queensland.
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Widespread storms hit many locations from the Gold Coast to the Sunshine Coast hinterland.
Vision of a tornado was also recorded across the Brisbane River to the surprise of residents.
The rotating column of air and moisture spawned from a supercell thunderstorm.
There was no reports of damage due to the location of the tornado.
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