The fire, burning over about 400,000 hectares, has moved further into the Blue Mountains - a popular tourist area which lies west of the city. It is a blow to crews who are already battling over 100 fires and bracing for extreme temperatures this week. The heatwave could bring the nation's hottest day on record, forecasters say. Temperatures could exceed the 50.7C (123.26F) record set in Oodnadatta, South Australia, in 1960, according to the Bureau of Meteorology.