The FFDI on Black Saturday , 7 February 2009 , reached much higher than the maximum value of 100 . At such extremes it is meaningless to specify a particular value of FFDI . After the Black Saturday bushfires , the McArthur Forest Fire Danger Index was revised . The category " Catastrophic " was added to help identify those situations where fires will spread so quickly that they present a critical threat to life and safety .
Black Saturday
Black Saturday bushfires
McArthur Forest Fire Danger Index