Any respite is welcome, against a blistering heat wave that has settled over Australia's south and southeast.<br/> <br />The temperature in Melbourne is expected to reach 44 degrees Celsius on Thursday.<br/> <br />In Adelaide, it could reach 46 Celsius, whereby it will earn the distinction of being the world's hottest city.<br/> <br />A climate change watchdog warns that Australia can expect longer and hotter periods of extreme heat.<br/> <br />Analysts say prolonged heat waves would threaten Australia's agricultural production.
