Adelaide and Melbourne are set to swelter on Monday with temperatures pushing 40C while regional inland areas in South Australia and Victoria can expect a mini-heatwave to last for several days.
Bureau of Meteorology forecaster Jonathan How said temperatures would spike in Adelaide by noon on Monday and several hours later in Melbourne as a heat blast moves east.
The temperature spike stems from the northern regions of WA where temperatures have climbed to 45C in the Pilbara,” Mr How said.
“It‘s going to be the warmest day of the year, so far, for Victoria.
“It’s going be pretty hot on Sunday but Monday is going to be the peak day and getting up into the high 30s along the coast and low 40s inland.”
Severe fire danger warnings have been issued for several Victorian areas in the north and northwest of the state, including the Mallee and Wimmera regions.
“We’re looking at elevated fire danger across parts of north and west of Victoria, towards the South Australian border,” he said.
He said Adelaide would experience similar temperatures although a cool change was expected to flatten temperatures by early afternoon.
Melbourne’s mini heat spike will last well into Monday night before the cool change moves in.
However, there will be no let-up of heat in the north and northwest of Victoria for several days.
The mercury is expected to rise above 40 until at least Wednesday in the Wimmera, Mallee and northern regions.
“There is a cool change coming on Monday night (Melbourne), but unfortunately for inland areas, it is going to be a run of really hot of days in the high 30s and low 40s until Wednesday,” he said.
He said there may be a let-up of scorching heat in Melbourne and Adelaide after this week but there was no shot-term end in sight for the Pilbara where the heatwave emanated.
“So mid next week, there are going to (be placed that) get into the high 40s where it’s getting up to 46, 47 and 48.
“It’s the usual suspects, like Marble Bar when it gets into the high 40s.”
He said after the heat passed it “looks like a week long pattern of cooler conditions” for the southeast.
“It will be cooler than average for Victoria, Tasmania and SA into next week,” Mr How said.
“For eastern NSW, into Queensland, there will be showers and thunderstorms developing again later this week with cooler conditions remaining south of Queensland.”