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Grassland fire danger index image not available
- Fire authorities may consider other risk factors besides Fire Danger Indices (FDI) when determining a Fire Danger Rating. Consequently Fire Danger Indices should not be used in place of the official Fire Danger Ratings.
- These maps are updated twice a day at approximately 6am and 6pm during the fire season. These maps may not reflect the latest official forecasts which can be updated at any time. Always use these maps together with the Bureau's warnings and weather forecasts and with Fire Danger Ratings issued by the fire authority. These maps are not available outside the fire season.
- The calculated FDI values are based on representative values of wind speed, temperature, humidity and fuel conditions for each 3 or 6 km grid square and do not take into account more local variations in topography and fuels. Local variations in elevation, slope, and aspect may cause the FDI values at a point location to be different from the values indicated by these graphical forecasts. These differences may also result in significant differences between the observed rates of spread of fires and the rates of spread calculated from these FDI forecasts.
- Striped patterns on the FDI maps are sometimes displayed when bands of stronger winds are forecast. These patterns are artefacts of processing the Maximum FDI from hourly forecasts of FDI.
- The Grassland Fire Danger Index (GFDI) has been calculated using grass curing and fuel load data supplied by the Fire Authority. The Forest Fire Danger Index (FFDI) has been calculated using a Drought Factor Value calculated by the Bureau of Meteorology based on either the Keetch Byram Drought Index or the Mount Soil Dryness Index.
- You accept all risks and responsibility for losses, damages, costs and other consequences resulting directly or indirectly from using this site and any information or material available from it.
- FDI values are very sensitive to input values. To demonstrate how the FDI is affected by small changes in temperatures, humidity and wind speed, the table below shows the large range of GFDI and FFDI for a fixed Forest Fuel Dryness Drought Factor of 10 and a fuel load of 4.5 tonnes per hectare, a 40°C temperature, 8% humidity and a wind change of just 3 kilometres per hour.
Scenario: Temperature = 40 °C +/- 1 °C Relative Humidity = 8 % +/- 2 % Wind Speed +/- 3 km/h
Central FDI Value GFDI range FFDI range 50 40–65 40–60 75 55–100 60–90 100 80–130 85–120 150 120–190 125–180