9news.com.au | Extreme heat warning issued with Adelaide and Melbourne temperatures set to ... 9news.com.au December 16, 2015: There are warnings across much of South Australia and Victoria today for another devastating bout of extreme heat. FTBAPGL. Authorities have warned Victorians and South Australians to brace for an extreme heatwave, with ... SA visitors warned about extreme heat Extreme heat warning for SA Extreme heat warning for South Australia, with temperatures hitting 42C |