These graphs present Forest Fire Danger Index and Grass Fire Danger Index against weather conditions for the last 31 days.
The graphs are updated every day just after 09:00 hours.
The data displayed represents a FORECAST of the FFDI/GFDI Indices for later the same day
The highest risk period being between ( 14:00 to 16:00 ) hours.
Click one of the six thumbnail graphs to display it as the large graph.
|Forest Fire Danger Index||Forest Fire Danger Index /
Build Up Index
|Grass Fire Danger Index|
|Fine Fuel Moisture Code /
Duff Moisture Code
|Initial Spread Index /
|Drought Code /
Fire Weather Index
Tasmanian - Fire Ban Status : Currently NO Tasmanian Fire Bans Declared
Tasmanian - Fire Permit Status : A fire permit can be obtained by free calling 1800 000 699
NOTE: You are reminded that fire restrictions apply throughout the fire season. Permit periods are usually in force during the dry summer period from November to March although this will vary from year to year depending on the dryness of the vegetation and the fire danger. Based on the latter, Tasmania is
NOTE: For information on FIRE BANS, please contact the Tasmanian Fire Service (TFS) Hotline on 1800 000 699 or visit the Tasmanian Fire Service web site. Additional Fire Weather related information is also available through the Bureau of Meteorology web site.
The following Data is produced by Beaumaris - Weather (beaumaris-weather.com) for our local area.
IMPORTANT: DO NOT USE THIS INFORMATION FOR MAKING DECISIONS.
Fire Danger Information for Beaumaris is calculated on site by FWI Calc software, daily at 09:00 and updated as necessary throughout the day until the peak values have been reached.
The lastest update was at : 20221205 10:15
|Index / Code||Value||Calc Inputs||Value|
|Forest Fire Danger Index (FFDI)||1.9||Temperature at Initial Calculation Time (Temp)||17.8|
|Grass Fire Danger Index (GFDI)||2.6||Humidity at Initial Calculation Time (Hum)||89|
|Fire Weather Index (FWI)||0.7||Wind at Initial Calculation Time (Wind)||11.3|
|Fine fuel moisture code (FFMC)||63.6||Rain at Initial Calculation Time (Rain)||2.00|
|Duff moisture code (DMC)||10||Peak Times (ReCalc Time)||10:15|
|Drought Factor (DF)||4||Peak Tempurature (ReCalc Temp)||18.2|
|Initial spread index (ISI)||0.9||Peak Humidity (ReCalc Hum)||86|
|Build up index (BUI)||14||Peak Wind (ReCalc Wind)||12.9|
The Forest Fire Danger Index (FFDI) is a numeric rating between 0 and 100(+), The new scale and the associated conditions described below are based on the Forest Fire Danger Index (FFDI) and the Grassland Fire Danger Index (GFDI). The FFDI is the basis for determining the FDR and provides an assessment of the potential fire behaviour, the difficulty of suppressing a fire, and the potential impact on the community should a bushfire occur on a given day. The FFDI was developed in the 1960s by CSIRO scientist A.G. McArthur to measure the degree of danger of fire in Australian forests. The index combines a record of dryness, based on rainfall and evaporation, with meteorological variables for wind speed, temperature and humidity. The GFDI is based on the FFDI approach and incorporates the degree of grassland curing (drying).
A rating of: FFDI
A rating of: GFDI
The Fine Fuel Moisture Code (FFMC) is a numeric rating between 0 and 101 of the moisture content of litter and other cured fine fuels. This code is an indicator of the relative ease of ignition and the flammability of fine fuel. It is calculated using wind, temperature, relative humidity and rain.
A rating of:
The Duff Moisture Code (DMC) is a numeric rating between 0 and 150 of the average moisture content of loosely compacted organic layers of moderate depth. This code gives an indication of fuel consumption in moderate duff layers and medium-size woody material. It uses temperature, relative humidity and rain in it's calculation.
A rating of
THE BYRAM-KEETCH DROUGHT INDEX (BKDI) and DROUGHT FACTOR (DF)
The Byram-Keetch Drought Index (BKDI) attempts to measure the amount of precipitation necessary to
return the soil to full field capacity. It is a closed system ranging from 0 to 203 units (0 - 800 imperial)
and represents a moisture regime from 0 to 203 millimetres (0 - 8 inches) of water through the soil layer.
At 203 millimetres (8in) of water, the KBDI assumes saturation. Zero is the point of no moisture
deficiency and 203 (800) is the maximum drought that is possible. At any point along the scale, the index
number indicates the amount of net rainfall that is required to reduce the index to zero, or saturation.
The inputs for KBDI are weather station latitude, mean annual precipitation, maximum dry bulb
temperature, and the last 24 hours of rainfall. Reduction in drought occurs only when rainfall exceeds
5mm (0.20 inch) (called net rainfall).
Drought Factor (DF): A key component of the FFDI is the modelling of the dryness of the fuel. This is expressed by the Drought Factor (DF), which ranges from 0 to 10. If this is multiplied by 10 and called a percent, it gives the percentage of fine fuel that would be removed by a fire under the current conditions. The DF is based on recent rainfall and on the Byram-Keetch Drought Index (BKDI).
The Drought Code (DC) is a numeric rating between 0 and 800 of the average moisture content of deep, compact organic layers. This code is a useful indicator of seasonal drought effects on forest fuels and the amount of smoldering in deep duff layers and large logs.
A drought code of:
The Initial Spread Index (ISI) is a numeric rating between 0 and 100 of the expected rate of fire spread. It combines the effects of wind and the FFMC on rate of spread without the influence of variable quantities of fuel. It uses the FFMC rating and Wind in it's calculation.
An ISI of greater than 10 will see rapid spread of fires.
The Buildup Index (BUI) is a numeric rating between 0 and 200 of the total amount of fuel available for combustion. To calculate it combines the DMC and the DC..
A BUI of greater than 40 is a high fire risk with a BUI of greater than 60 is an extreme fire risk.
The Fire Weather Index (FWI) is a numeric rating between 0 and 150 of fire intensity. It combines the Initial Spread Index and the Buildup Index. It is suitable as a general index of fire danger.
The ratings are based on the following FWI scores: