12/5/2023 0 Comments Fire weather calculator![]() ![]() Additional details on how the FFDI dataset is calculated are documented in Dowdy. The Drought Factor is based on the accumulated soil moisture deficit, calculated here using the Keetch-Byram Drought Index (KBDI ) using daily rainfall and maximum temperature. The FFDI is calculated from input variables of temperature, relative humidity and wind speed on a given day, as well as a number representing fuel availability called the Drought Factor. These fire weather climatology data products were produced based on daily values of the FFDI from 1950 to 2016. ![]() In addition, information on future projected changes in bushfire conditions based on the FFDI is also available, as detailed in the publication Dowdy et al. Further information on this dataset is available in a research publication, including details on the influence of the El NiƱo/Southern Oscillation (ENSO) and climate change trends. Maps are also presented for the total number of days over this time period with FFDI higher than its 90th percentile (which represents the highest 10% of values for all months of the year). In addition to mean values, the total number of days over this time period with FFDI higher than 50 is presented for each month. It is intended for use in examining broad-scale features in fire weather conditions for regions throughout Australia. This dataset provides observations-based information using a 67-year time period. In addition to the weather, bushfire events in Australia are also influenced by factors such as vegetation conditions, terrain and ignition sources. The FFDI is based on a combination of different weather conditions known to influence the risk of dangerous bushfire conditions in Australia, including temperature, rainfall, humidity and wind speed. Higher values represent more dangerous weather conditions for bushfires: for example, FFDI above 50 is classed as 'Severe'. These maps show the mean Forest Fire Danger Index (FFDI) over Australia for each month for the period 1950 to 2016. Product code: IDCJCM0051 About these maps
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