Since 1950, the number of days of h

Since 1950, the number of days of hot weather (above 35 ℃) and extremely hot weather (above 40 ℃) has increased significantly in most parts of Australia every year. The duration of the heat wave is longer, the temperature exceeds the highest record, and more frequent heat wave events will be seen in more parts of Australia in the future. From 1951 to 2011, the average intensity of Melbourne heat wave events increased by 1.5 C, and the average intensity of heat wave peak days increased by 2 C. The increase of heat wave intensity has certain influence on the dangerous weather of jungle fire. For example, before the "Black Saturday" fire broke out in 2009, Victoria experienced a decade-long drought and a record high temperature year lasting several years, and just weeks before the fire broke out, Victoria experienced a serious heat wave event. The temperature on February 7 broke the record for the highest temperature. The highest temperature was 23 C higher than the average temperature in February in Victoria. More than 87% of the state set the record for the highest temperature in February. During this period, the Forest Fire Risk Index (FFDI) was between 120 and 190, the highest on record.