Moving in from the west, the unstable weather system threatens severe storms. Picture: File Source: Supplied
SUPERCELL thunderstorms with the potential to create tornadoes are threatening to smash NSW and Queensland this weekend.
Considered the most dangerous storms, supercells develop where wind shear is present through a very unstable atmosphere.
"Supercell thunderstorms are likely to produce severe weather," said Tom Saunders, Senior Meteorologist at The Weather Channel.
He said such extreme weather events were "likely across northeast New South Wales and southeast Queensland this weekend and have the potential to cause flash flooding, damaging winds and large hail".
"The wind shear leads to rotation within the storm and a longer lifespan," he said.
"Supercells often cause very heavy rain and flash flooding, large hail, damaging winds gusts and occasionally tornadoes.
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The more intense thunderstorms this weekend have the potential to bring around 50mm of rain, but most of northeast New South Wales and southeast Queensland are expected to receive at least 20mm.
Mr Saunders said the chance of severe storms would reduce by Monday as the trough moves offshore.
In Queensland, any storms will follow an early burst of hot weather.
Ipswich is expected to record a top of 37C on Saturday, as will Brisbane's western and southern suburbs.
Much of the west will be in the 40s.
Weather Bureau forecaster Bryan Rolstone said the hottest place in the state would most likely be Bedourie in the far southwest, with 43C.
"A northwest wind will bring hot air out of the Gulf (of Carpentaria) and the NT," Mr Rolstone said.
"There'll be more moisture around on Saturday and a trough will be right on us, providing lift and moisture.
"We're about a month behind with our storm season, but moisture levels are rising."
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