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Firefighters are on high alert with parts of Australia tipped to have seven days above 40C.
Roxby Downs and Oodnadatta in South Australia's outback are set to sizzle with six days in a row above 45C and the tiny town of Tarcoola is forecast to reach 47C on Monday.
Temperatures will remain above 40C for the next six or seven days in many other inland parts of Australia including the towns of Mildura and Ouyen in Victoria.
Victoria is set to experience its longest stretch of heat and some of its worst fire conditions since Black Saturday when 173 people died.
Many towns in eastern Western Australia and western Queensland will also feel the heat, with temperatures set to soar into the 40s in parts of both states.
Even Hobart won't escape the warm weather, with 38C predicted for Friday.
Firefighters in Victoria are preparing for one of the worst days since Black Saturday.
Country Fire Authority state duty officer Brett Boatman says conditions on Friday will be extreme in parts of Victoria.
"It is certainly one of the higher fire danger days I have seen since Black Saturday, no doubt," Mr Boatman told AAP on Wednesday.
Ambulance Victoria paramedic team manager Huw Colechin urged people to take care of themselves and take adequate rest breaks if working outside.
"Drink plenty of fluids, take a moment to check on friends and neighbours and relatives," he said on Thursday.
"The elderly or people with chronic illnesses don't manage well in high temperatures."
Mr Colechin urged people to reduce their physical activity and to exercise early in the morning or at night.
He reminded parents not leave children unattended in cars.
"High temperatures represent a life threatening situation to a child locked in a vehicle," he said.