Only 6 years after the weathermen needed a new color [theguardian.com] for just one spot of extreme temperatures on the map, this is how it looks [youtube.com] when that color needs to be used for over 30% of the Australia's area.
And that for 3 days in a row, starting today, Dec 18 2019 (like, meh, just a balmy 40C in Melbourne at 18:30, she'll be apples).
BBC - Australia heatwave: Nation endures hottest day on record [bbc.com]
Guardian Australia heatwave: records forecast to be broken as temperatures surge past 40C [theguardian.com]
Severe-weather.eu An extreme heatwave is about to swipe across Australia, raising maximum temperatures up to near 50°C (122°F) in S/SE parts of the continent, breaking many all-time records! [severe-weather.eu]
AFP Australia has its hottest day on record, more to come [afp.com]