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Fire Weather Data

For South Franklin, Huon Valley Southern Tasmania

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.

FFDI Graphs

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
FFDI GFDI GFDI
Fine Fuel Moisture Code /
Duff Moisture Code
Initial Spread Index /
Build-Up Index
Drought Code /
Fire Weather Index
FFMC/DMC ISI/BUI DC/FWI


  Tasmanian - Fire Ban Status : Currently NO Fire Bans Declared

  Tasmanian - Fire Danger Status : 0 None Reported By BoM or TFS

  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 Currently Not in Fire Season! 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.

Also available on the TFS website : Bushfire Protection Plans | FRANKLIN Plan (pdf) | GEEVESTON Plan (pdf)


Un-Official - Fire Danger Rating : South Franklin - Southern Tasmania.

The following Data is produced by Huon Valley - South Franklin - Weather (SouthFranklinWeather.com) for our local area.

Fire Ban Status

IMPORTANT: DO NOT USE THIS INFORMATION FOR MAKING DECISIONS.
Fire Danger Information for Franklin 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 : 20180622 11:31

Index / Code Value Calculation Inputs Value
Forest Fire Danger Index (FFDI) 0.4 Temperature at Initial Calculation Time (Temp) 6.9
Grass Fire Danger Index (GFDI) 0.0 Humidity at Initial Calculation Time (Hum) 97
Fire Weather Index (FWI) 0.0 Wind at Initial Calculation Time (Wind) 1.6
Fine fuel moisture code (FFMC) 10.5 Rain at Initial Calculation Time (Rain) 0.20
Duff moisture code (DMC) 0 Peak Times (ReCalc Time) 11:30
Drought Factor (DF) 7 Peak Tempurature (ReCalc Temp) 11.8
Initial spread index (ISI) 0.0 Peak Humidity (ReCalc Hum) 86
Build up index (BUI) 0 Peak Wind (ReCalc Wind) 1.6


South Franklin Fire Weather

The following is Fire Weather Data for the South Franklin Weather weather station.

Last Updated: 22/06/2018 11:31:04 AM

DateTemp
ºC
Humidity
%
Wind Spd
kmph
Rainfall
mm
Peak Temp
ºC
Peak Humidity
%
Peak Wind
kmph
FFDIFFDI DCGFDIGFDI DCGFDCDFISIBUIFWI DC
22/06/20186.9971.60.2011.8861.60.4LM0.0LMLW70.00LW
21/06/20184.5980.00.0011.6654.81.0LM0.0LMLW50.00LW
20/06/20180.6980.00.206.9981.60.3LM0.0LMLW70.00LW
19/06/20183.9960.00.207.7891.60.4LM0.0LMLW70.00LW
18/06/20186.9930.07.8010.9836.40.2LM0.0LMLW10.00LW
17/06/20189.5928.052.209.9918.00.0LM0.0LMLW00.00LW
16/06/20188.0943.217.6011.4793.20.0LM0.0LMLW00.00LW
15/06/20189.3801.65.6012.3716.40.5LM0.0LMLW20.01LW
14/06/20186.9880.00.4012.7664.81.2LM0.0LMLW60.53LW
13/06/20186.5981.60.2013.1823.20.8LM0.0LMLW70.52LW
12/06/20185.4940.00.0010.9884.80.8LM0.0LMLW50.42LW
11/06/20181.7970.00.2011.6821.60.4LM0.0LMLW70.42LW
10/06/20182.1970.00.0010.2814.80.9LM0.0LMLW50.42LW
09/06/201810.7763.21.0014.1666.41.4LM0.0LMLW50.52LW
08/06/201813.5723.20.0015.3608.01.9LM0.0LMLW50.32LW
07/06/20187.3961.60.0015.9638.01.8LM0.0LMLW50.01LW
06/06/20180.91000.00.207.9906.41.5LM0.0LMLW70.01LW
05/06/20186.1970.00.0011.7710.00.0LM0.0LMLW50.01LW
04/06/20185.7973.20.0013.8714.81.0LM0.0LMLW50.01LW
03/06/20184.5970.00.007.5954.80.8LM0.0LMLW50.01LW
02/06/20185.3970.00.009.3914.80.8LM0.0LMLW50.01LW
01/06/20186.9910.00.0012.6756.41.3LM0.0LMLW50.01LW
31/05/20184.0960.04.2011.6636.40.6LM0.0LMLW20.01LW
30/05/20187.3851.62.2012.1686.41.1LM0.0LMLW40.33LW
29/05/201815.7699.70.2016.9639.73.2LM0.0LMLW71.74LW
28/05/20186.4980.00.6015.7870.00.0LM0.0LMLW60.73LW
27/05/20182.5971.60.208.2941.60.4LM0.0LMLW70.83LW
26/05/20185.7950.00.0014.2633.20.7LM0.0LMLW50.83LW
25/05/20184.6960.00.0012.7684.81.0LM0.0LMLW50.83LW
24/05/201811.0674.80.0012.6688.01.7LM0.0LMLW51.13LW
23/05/201813.1724.80.0014.2748.01.6LM0.0LMLW50.83LW
22/05/201811.5628.00.2012.9598.02.6LM0.0LMLW70.72LW
21/05/201811.4738.05.6014.2698.00.7LM0.0LMLW20.11LW
20/05/201812.6568.00.0014.2588.01.9LM0.0LMLW50.32LW
19/05/201810.4811.60.0013.3744.81.1LM0.0LMLW60.01LW
18/05/20189.9930.010.2014.1743.20.1LM0.0LMLW10.00LW
17/05/201810.9960.01.4014.5823.20.6LM0.0LMLW50.01LW
16/05/20184.7950.00.4012.0756.41.5LM0.0LMLW60.01LW
15/05/201810.4763.20.2012.7644.81.5LM0.0LMLW70.01LW
14/05/20187.4980.00.0015.4694.81.0LM0.0LMLW50.00LW
13/05/20187.8970.00.6013.8799.72.2LM0.0LMLW60.00LW
12/05/20188.7960.03.4012.9906.40.7LM0.0LMLW30.00LW
11/05/201811.09316.188.0011.79317.70.0LM0.0LMLW00.00LW
10/05/20184.9960.01.0011.09320.93.4LM0.0LMLW50.22LW
09/05/201815.5646.40.0017.65611.32.9LM0.0LMLW50.52LW
08/05/20189.1740.04.8014.4588.00.8LM0.0LMLW20.01LW
07/05/201813.8761.60.4019.94511.34.2LM0.0LMLW60.52LW
06/05/201814.3704.82.4016.4578.01.6LM0.0LMLW40.31LW
05/05/201812.1791.61.8017.3626.41.2LM0.0LMLW40.22LW
04/05/201812.3890.01.8017.6546.41.3LM0.0LMLW40.22LW
03/05/20189.7930.00.0020.1526.41.8LM0.0LMMD50.63LW
02/05/20188.3890.00.0017.0713.20.7LM0.0LMMD50.63LW
01/05/201812.3834.80.0020.5544.81.3LM0.0LMMD50.83LW
30/04/201813.8656.40.0016.3566.41.6LM0.0LMMD50.72LW
29/04/201810.2960.00.0015.9546.41.6LM0.0LMLW50.11LW
28/04/20187.9994.80.0016.9658.01.8LM0.0LMLW50.10LW
27/04/201812.7791.62.0015.9733.20.5LM0.0LMLW40.10LW
26/04/201811.9743.25.0014.5678.00.7LM0.0LMLW20.01LW
25/04/201815.7803.20.0020.8556.41.7LM0.3LMLW50.42LW
24/04/20189.0990.00.0020.9680.00.0LM0.0LMLW50.11LW
23/04/201812.4944.80.0019.8596.41.6LM0.5LMLW50.11LW
22/04/201813.3963.20.0021.0646.41.5LM0.7LMLW50.01LW
21/04/201811.9970.00.0020.1686.41.5LM0.8LMLW50.01LW
20/04/20186.6994.80.0017.4694.81.0LM0.3LMLW50.00LW
19/04/20189.7971.60.0017.2654.81.1LM0.7LMLW50.00LW
18/04/20188.2940.00.0015.6646.41.7LM0.6LMLW60.00LW
17/04/201811.1744.88.8013.4636.40.3LM0.2LMLW10.00LW
16/04/201811.2699.712.6014.4849.70.4LM0.0LMLW10.00LW
15/04/20188.0873.224.4010.4726.40.0LM0.0LMLW00.00LW
14/04/201814.1754.85.8017.1628.00.8LM2.1LMLW20.00LW
13/04/201814.6746.44.6017.9646.40.6LM2.2LMLW20.01LW
12/04/201810.3974.83.6014.1954.80.5LM0.0LMLW30.02LW
11/04/201813.4900.00.0013.7891.60.3LM0.0LMLW50.15LW
10/04/201813.9820.00.2021.9528.03.2LM4.3LMLW70.14LW
09/04/201812.3903.24.8016.0803.20.2LM1.2LMLW20.04LW
08/04/201812.3960.01.0019.1781.60.3LM2.1LMMD50.57LW
07/04/20189.6963.20.2016.5624.81.6LM2.8LMMD70.97LW
06/04/201810.9923.20.4016.1644.81.3LM2.9LMMD60.97LW
05/04/201811.9940.00.0018.8704.81.1LM3.3LMMD50.76LW
04/04/201818.1684.80.0022.2546.41.8LM5.3LMMD50.96LW
03/04/201816.5763.20.2020.9619.73.4LM5.5LMMD70.54LW
02/04/201814.0853.23.0018.0549.71.5LM5.4LMLW30.13LW
01/04/201816.1733.20.0019.4684.81.1LM4.1LMMD50.75LW
31/03/201814.7724.80.2019.1558.03.0LM5.7LMMD70.44LW
30/03/201814.3838.05.8016.4558.00.8LM4.9LMLW20.02LW
29/03/201817.2671.60.0020.5558.02.1LM6.0LMMD50.34LW
28/03/201815.1850.00.2021.4679.73.2LM5.7LMLW70.02LW
27/03/201813.3703.21.4016.2634.81.1LM3.8LMLW50.02LW
26/03/201810.2940.013.4014.9789.70.4LM3.2LMLW10.00LW
25/03/201811.2990.04.0019.1536.41.0LM5.6LMLW30.01LW
24/03/201814.0930.02.6020.0761.60.2LM3.6LMLW30.04LW
23/03/201816.2731.60.0023.7498.02.5LM7.7LMLW50.27LW
22/03/201811.7860.00.0016.66714.53.2LM5.7LMLW50.05LW
21/03/20186.7956.41.4015.4626.41.5LM4.1LMLW50.05LW
20/03/20189.6843.24.0014.8476.41.1LM5.3LMLW30.05LW
19/03/201815.5776.47.6017.3736.40.3LM4.1LMLW10.08LW
18/03/201816.4891.613.4025.64111.30.8LM10.8LMLW10.014LW
17/03/201821.8588.00.0028.4398.03.2LM10.2LMHI53.228MD
16/03/201812.6803.20.6020.7508.02.8LM7.3LMMD61.725MD
15/03/201814.8701.60.0018.3606.41.6LM5.6LMHI52.124MD

Introduction to Fire Weather Warnings: More on BOM site:

Wind, temperature, humidity and rainfall are weather elements that affect the behaviour of bushfires. In Australia there is a system of assessing these in conjunction with the state of the available fuels to determine a measure of "fire danger" or the difficulty of putting out any fires which may occur. The Bureau of Meteorology alerts the public when conditions are likely to be dangerous. These services products include Fire Weather Warnings and Total Fire Ban Advices.

Changes to Fire Weather Warnings and Forecasts from October 2010

The Bureau of Meteorology has modified its forecasts and warnings to be consistent with the latest changes to the Fire Danger Ratings used by fire agencies.

What's changed?

In 2009 the Extreme category was divided into three levels - Severe, Extreme and Catastrophic (Code Red in Victoria). These index ranges were common for both the Forest Fire Danger Index (FFDI) and the Grass Fire Danger Index (GFDI). In October 2010, fire agencies adopted a revised scale for some areas. Within the modified arrangements, there are different ranges for the grass and forest indices.

Because a single range of index values no longer correspond to the danger ratings of Severe, Extreme and Catastrophic (Code Red) , the Bureau will indicate the Fire Danger Rating Category without reference to the Fire Danger Index. For example "Extreme: FDR 75 to 99" will now be shown as "Extreme".

Australian Fire Danger Ratings

In the wake of the Black Saturday bushfires, Victoria adopted the nationally agreed Fire Danger Rating (FDR) scale to help communities understand information about fire danger. This new rating scale recognises the significant increase in severe bushfire conditions over the past decade and the subsequent greater level of danger to the community.

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).

Catastrophic Fire Danger Rating (FDR >100)
 
Leaving early is the safest option for your survival - regardless of any plans to stay and defend your property.
 
Most fires breaking out today will spread rapidly and be uncontrollable. There is a high likelihood that people in the path of a fire will be killed or seriously injured. Many homes are very likely to be destroyed. Even the best prepared homes will not be safe today.
 
Tasmania Fire Service recommends that you should not plan to defend any home when the fire danger rating exceeds 100 (catastrophic), regardless of any preparations you have made, unless firefighters have assessed your home as defendable in the prevailing conditions.
 
If you live in or near bushland, the Tasmania Fire Service recommends that you prepare immediately to leave for a safe place. Leave if fire breaks out or is burning near you, and well before fire threatens your home.
 
Listen for warnings on ABC Local Radio or check the TFS website at www.fire.tas.gov.au to find out where fires are burning. Power, water supplies and phones are likely to fail in a bushfire. If power fails, listen to fire updates on your car radio.
 
Frequently check conditions outside your home. If smoke is blowing towards you, a fire is approaching and you should leave immediately by a safe route, away from the fire. Don’t wait for an official warning. If ash or burning embers are landing in your yard, the fire is very close and it may be too late to leave. If it is too late to leave, take shelter in your home. Fill your bath and all available containers with water, and actively defend your home by using the water to put out any parts of your home that catch fire. Alternatively and if time permits, go immediately to a nearby safe place.
 
Don’t expect a fire truck or other emergency workers at your home during the fire.
 
  
Extreme Fire Danger Rating (FDR 75-99)
 
Some fires breaking out today will spread rapidly and be uncontrollable. People in the path of a fire may be killed or seriously injured. Many homes are very likely to be destroyed.
 
Leaving early is the safest option for your survival. Only well-constructed, well-prepared and actively defended homes are likely to offer safety during a fire.
 
Unless your home has a defendable space and has been designed and built specifically to withstand a bushfire, you should not plan to defend it if the fire danger rating exceeds 75 (extreme), unless firefighters have assessed your home as defendable in the prevailing conditions.
 
If you live in or near bushland and don’t plan to defend your home, the Tasmania Fire Service recommends that you prepare immediately to leave for a safe place. Leave if fire breaks out or is burning near you, and well before fire threatens your home.
 
Listen to ABC Local Radio or check the TFS website at www.fire.tas.gov.au to find out where fires are burning. Power, water supplies and phones are likely to fail in a bushfire. If power fails, listen to fire updates on your car radio.
 
Frequently check conditions outside your home. If smoke is blowing towards you, a fire is approaching. If planning to leave, you should leave immediately by a safe route, away from the fire. Don’t wait for an official warning. If ash or burning embers are landing in your yard, the fire is very close and it may be too late to leave. If this is the case, take shelter in your home. Fill your bath and all available containers with water, and actively defend your home by using the water to put out any parts of your home that catch fire. Alternatively and if time permits, go immediately to a nearby safe place.
 
Don’t expect a fire truck or other emergency workers at your home during the fire.
 
 
Severe Fire Danger Rating (FDR 50-74)
 
Some fires breaking out today will spread rapidly and be uncontrollable. People in the path of a fire may be killed or seriously injured. Some homes are likely to be destroyed.
 
Leaving early is the safest option for your survival. However, well-prepared and actively defended homes can offer safety during a fire.
 
Tasmania Fire Service recommends that you should not plan to defend your home when the fire danger rating exceeds 50 (severe), unless firefighters have assessed your home as defendable in the prevailing conditions.
 
If you live in or near bushland and don’t plan to defend your home, the Tasmania Fire Service recommends that you prepare to leave for a safe place. Leave well before fire threatens your home. 
 
Listen to ABC Local Radio or check the TFS website at www.fire.tas.gov.au to find out where fires are burning. Power, water supplies and phones are likely to fail in a bushfire. If power fails, listen to fire updates on your car radio.
 
Frequently check conditions outside your home. If smoke is blowing towards you, a fire is approaching. If planning to leave, you should leave immediately by a safe route, away from the fire. Don’t wait for an official warning. If ash or burning embers are landing in your yard, the fire is very close and it may be too late to leave. If this is the case, take shelter in your home. Fill your bath and all available containers with water, and actively defend your home by using the water to put out any parts of your home that catch fire. Alternatively and if time permits, go immediately to a nearby safe place.
 
Don’t expect a fire truck or other emergency workers at your home during the fire.
 
 
 Very High Fire Danger Rating (FDR 25-49)
 
Some fires breaking out today will spread rapidly and be difficult to control. There is a possibility that people in the path of a fire will be killed or seriously injured. Some homes may be destroyed. However, well-prepared and actively defended homes can offer safety during a fire. 
 
Unless you have created a defendable space around your home, Tasmania Fire Service recommends that you should not plan to defend it when the fire danger rating exceeds 25 (very high), unless firefighters have assessed your home as defendable in the prevailing conditions.
 
If you live in or near bushland and don’t plan to defend your home, the Tasmania Fire Service recommends that you prepare to leave for a safe place. Leave well before fire threatens your home. 
 
Listen to ABC Local Radio or check the TFS website at www.fire.tas.gov.au to find out where fires are burning. Power, water supplies and phones are likely to fail in a bushfire. If power fails, listen to fire updates on your car radio.
 
Frequently check conditions outside your home. If smoke is blowing towards you, a fire is approaching. If planning to leave, you should leave immediately by a safe route, away from the fire. Don’t wait for an official warning. If ash or burning embers are landing in your yard, the fire is very close and it may be too late to leave. If this is the case, take shelter in your home. Fill your bath and all available containers with water, and actively defend your home by using the water to put out any parts that catch fire. Alternatively and if time permits, go immediately to a nearby safe place.
 
Don’t expect a fire truck or other emergency workers at your home during the fire.
 
 
High Fire Danger Rating (FDR 12-24)
 
Fires breaking out today can be controlled. People in the path of a fire are unlikely to be killed or seriously injured if they take shelter. Well-prepared and actively defended homes can offer safety during a fire. 
 
If you live in or near bushland and don’t plan to defend your home, the Tasmania Fire Service recommends that you prepare to leave for a safe place. Leave well before fire threatens your home. 
 
Monitor the fire situation on ABC Local Radio or the TFS website at www.fire.tas.gov.au . Power and water supplies and phones may fail in a bushfire. If power fails, listen to fire updates on your car radio.
 
Frequently check conditions outside your home. If smoke is blowing towards you, a fire is approaching and if planning to leave, you should leave immediately by a safe route, away from the fire.
 
 
Low - Moderate Fire Danger Rating (FDR 0-11)
 
Fires breaking out today can be controlled easily. There is little risk to people and property.
 
Make sure you, your family and your property are well-prepared for the risk of bushfire.
 
 
 
 
 
 
 

Forest Fire Danger Index - 0.4

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

  • 0 - 11 suggests Low Moderate probability of fire ignitions
  • 12 - 24 suggests High probability of fire ignitions
  • 25 - 49 suggests Very High probability of fire ignitions
  • 50 - 74 suggests Severe fire behavior
  • 75 - 99 suggests Extreme fire behavior
  • 100+ suggests Code Red / Catastrophic fire behavior

Grassland Fire Danger Index - 0.0

A rating of: GFDI

  • 0 - 11 suggests Low Moderate probability of fire ignitions
  • 12 - 24 suggests High probability of fire ignitions
  • 25 - 49 suggests Very High probability of fire ignitions
  • 50 - 74 suggests Severe fire behavior
  • 75 - 99 suggests Extreme fire behavior
  • 100+ suggests Code Red / Catastrophic fire behavior

Fine Fuel Moisture Code - 10.5

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:

  • under 58 suggests low probability of fire ignitions
  • 58 - 74 suggests 50% of fires will ignite
  • 74 to 86 suggests all fires will rapidly ignite
  • over 86 suggests extreme fire behavior

Duff Moisture Code - 0

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

  • greater than 30 is high fire risk
  • greater than 40 is extreme fire risk

Drought Factor - 7

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).

Drought Code - 3

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:

  • 200 is a high risk of fire
  • 300 is a very high risk of fire
  • 350 is an extreme risk of fire

Initial Spread Index - 0.0

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.

Buildup Index - 0

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.

Fire Weather Index - 0.0

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:

  • FWI score of less than 7.0 is a low risk of fire
  • FWI score of between 7.0 and 15.9 is a moderate risk of fire
  • FWI score of between 16 and 24.9 is a high risk of fire
  • FWI score of between 25 and 30.9 is a very high risk of fire
  • FWI score of 31 or more is an extreme risk of fire


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