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Fire Danger Warning Index

The following is the FWI Data from the Wairoa Weather Station,
Hawkes Bay, New Zealand. Southern Hemisphere.
Last Updated: 19/03/2024 3:15:53 p.m.
FWI Calculator Version: 10.2.1.105

FWI-BBI Fire Risk

This is the Chandler Burning Index. The CBI uses the Air Temperature and Relative Humidity to calculate a numerical index of Fire Danger.


Danger Key

Indicates the Fire Danger high extreme band.


Explanantion of Fire Warning Codes and Indices can be found below.








Current Readings
FWIFFDIFMIGFDIBUIISIDCDMCFFMFFMCFFHGROSCBIAngstromDFBKDI
0.2 0.5 24.0 0.5 8 0.3 104 4 27.8 50.2 2.8 m 87.3 km/h 3.0 4.8 1 0

Month CBI/Danger Code
6.1    LW
Fire Danger Levels Index
Low
Moderate
High
Very High
Extreme
DateTemp
ºC
Humidty
%
Wind Spd
kmph
Rainfall
mm
FFMCDMCDCISIBUIFWI DCFFDI DCCBI DCFMI
19/03/202414.87112.28.1050.241040.38LOWLOW MODLOW24.0
18/03/202419.5699.70.0080.171131.912LOWLOW MODLOW22.4
17/03/202419.8597.20.0072.961081.010LOWLOW MODLOW19.8
16/03/202417.4599.75.1050.341030.38LOWLOW MODLOW20.4
15/03/202419.8831.14.8032.661050.010LOWLOW MODLOW25.8
14/03/202420.5835.06.0043.891070.115LOWLOW MODLOW25.6
13/03/202423.7685.00.0071.8141110.922LOWLOW MODLOW21.1
12/03/202420.6808.66.6051.2131050.320LOWLOW MODLOW24.9
11/03/202424.4383.60.0087.0211113.329LOWLOW MODLOW13.4
10/03/202419.7696.11.5076.0181041.125LOWLOW MODLOW22.3
9/03/202421.86314.80.0085.317994.624MODERATELOW MODLOW20.3
8/03/202419.37514.80.0084.716944.222LOWLOW MODLOW23.9
7/03/202420.8668.60.0086.515884.021LOWLOW MODLOW21.3
6/03/202418.3605.00.0087.213833.719LOWLOW MODLOW20.4
5/03/202422.1447.20.0088.012784.617LOWLOW MODLOW15.5
4/03/202427.25619.40.0085.39725.814LOWLOW MODLOW17.2
3/03/202422.5723.60.0071.77660.811LOWLOW MODLOW22.4
2/03/202422.3753.60.3056.65600.49LOWLOW MODLOW23.2
1/03/202419.8737.257.9033.34540.07LOWLOW MODLOW23.3
29/02/202417.3907.212.9025.881700.015LOWLOW MODLOW28.2
28/02/202423.6532.56.0059.2171920.428LOWLOW MODLOW17.4
27/02/202427.5693.62.1066.1251970.738LOWLOW MODLOW20.4
26/02/202422.2821.10.0056.0271890.340LOWLOW MODLOW25.0
25/02/202420.3802.58.4042.8261820.138LOWLOW MODLOW24.9
24/02/202430.2425.00.0090.0461935.558MODERATELOW MODLOW12.9
23/02/202424.8505.00.0086.8431853.554MODERATELOW MODLOW16.3
22/02/202423.06414.20.0082.3401773.051MODERATELOW MODLOW20.3
21/02/202423.0645.02.4072.4381700.949LOWLOW MODLOW20.3
20/02/202417.97512.20.0085.1431633.952MODERATELOW MODLOW24.3
19/02/202428.5463.60.0089.5421574.850MODERATELOW MODLOW14.4
18/02/202426.8532.50.0089.2381494.347MODERATELOW MODLOW16.5

This Years Statistic Data collected at 12.00pm Daily By FWI Calculator.
  ºC - Temperature     kmph - Windspeed     m - Distance     mm - Rainfall     Tonnes/Ha - Fuel Load  
  Rainfall:  303.00 mm        Rain Days:  23        Drought Days:  56        Day Rainfall High  57.90 mm  
Temperature High
Humidity High
Wind Speed High
FFMC High
DMC High
DC High
ISI High
BUI High
FWI High
CBI High
Angstrom High
FMI High
FFDI HIgh
GFDI High
DF High
BKDI High
33.8
90
23.4
92.3
46
216
9.6
58
21.6
51.5
1.1
10.3
5.6
3.1
7
0
20/01/2024
29/02/2024
11/02/2024
14/01/2024
24/02/2024
15/01/2024
14/01/2024
24/02/2024
14/01/2024
14/01/2024
14/01/2024
14/01/2024
4/03/2024
4/03/2024
17/03/2024
19/03/2024
Temperature Low
Humidity Low
Wind Speed Low
FFMC Low
DMC Low
DC Low
ISI Low
BUI High
FWI Low
CBI Low
Angstrom Low
FMI Low
FFDI Low
GFDI Low
DF Low
BKDI Low
14.8
34
0.0
25.1
2
16
0.0
4
0.0
-1.1
5.5
28.2
0.0
0.7
0
0
19/03/2024
14/01/2024
15/01/2024
30/01/2024
31/01/2024
30/01/2024
15/03/2024
31/01/2024
15/03/2024
29/02/2024
29/02/2024
29/02/2024
1/03/2024
15/03/2024
1/03/2024
19/03/2024

Statistic Data since Records began on 23/05/2011.
  ºC - Temperature     kmph - Windspeed     m - Distance     mm - Rainfall     Tonnes/Ha - Fuel Load  
  Highest Rainfall in 1 day:  345.60 mm  28/04/2018  (Recorded by FWI Calculator)  
Temperature High
Humidity High
Wind Speed High
FFMC High
DMC High
DC High
ISI High
BUI High
FWI High
CBI High
Angstrom High
FMI High
FFDI HIgh
GFDI High
DF High
BKDI High
36.4
100
58.0
96.1
160
663
27.9
199
51.1
138.1
0.2
5.6
22.3
9.4
10
177
31/01/2020
31/12/2011
14/07/2017
12/01/2020
7/02/2017
7/02/2017
4/02/2020
7/02/2017
19/01/2017
3/11/2019
12/01/2020
12/01/2020
12/09/2012
13/02/2017
29/06/2016
4/03/2013
Temperature Low
Humidity Low
Wind Speed Low
FFMC Low
DMC Low
DC Low
ISI Low
BUI High
FWI Low
CBI Low
Angstrom Low
FMI Low
FFDI Low
GFDI Low
DF Low
BKDI Low
3.9
13
0.0
0.0
0
1
0.0
0
0.0
-2.4
7.3
33.8
N/A
0.0
0
0
8/07/2015
3/11/2019
15/01/2024
31/12/2011
10/07/2023
25/07/2011
15/03/2024
10/07/2023
15/03/2024
8/07/2015
8/07/2015
8/07/2015
N/A
25/11/2023
1/03/2024
19/03/2024
FWI-Temperature
FWI-Rainfall Fire Risk
Fire Risk:   Very Low
Current Open Air Fire Bans: No

Open Fire Season as from the 1st April 2019 at 6.00am for both Urban and Rural areas.

FWI-BKDI
FWI-Humidity
FWI-Wind Speed FWI-BUI
FWI-DCF FWI-DMC
FWI-FFMC FWI-ISI

Explanation of Fire Weather Index Indices

FWI-ISI

FFMC (Fine Fuel Moisture Code)
This is a numerical rating of the moisture content of surface litter and other cured fine fuels. It shows the relative ease of ignition and flammability of fine fuels. The moisture content of fine fuels is very sensitive to the weather. Even a day of rain, or of fine and windy weather, will significantly affect the FFMC rating. The system uses a time lag of two-thirds of a day to accurately measure the moisture content in fine fuels. The FFMC rating is on a scale of 0 to 99. Any figure above 70 is high, and above 90 is extreme.

DMC (Duff Moisture Code)
DMC is a numerical rating of the average moisture content of loosely compacted organic layers of moderate depth. The code indicates the depth that fire will burn in moderate duff layers and medium size woody material. Duff layers take longer than surface fuels to dry out but weather conditions over the past couple of weeks will significantly affect the DMC. The system applies a time lag of 12 days to calculate the DMC. A DMC rating of more than 30 is dry, and above 40 indicates that intensive burning will occur in the duff and medium fuels. Burning off operations should not be carried out when the DMC rating is above 40.

DC (Drought Code)
The DC is a numerical rating of the moisture content of deep, compact, organic layers. It is a useful indicator of seasonal drought and shows the likelihood of fire involving the deep duff layers and large logs. A long period of dry weather (the system uses 52 days) is needed to dry out these fuels and affect the Drought Code. A DC rating of 200 is high, and 300 or more is extreme indicating that fire will involve deep sub-surface and heavy fuels. Burning off should not be permitted when the DC rating is above 300.

ISI: (Initial Spread Index)
This indicates the rate fire will spread in its early stages. It is calculated from the FFMC rating and the wind factor.

The open-ended ISI scale starts at zero and a rating of 10 indicates high rate of spread shortly after ignition. A rating of 16 or more indicates extremely rapid rate of spread.

BUI (Build Up Index)
This index shows the amount of fuel available for combustion, indicating how the fire will develop after initial spread. It is calculated from the Duff Moisture Code and the Drought Code.

The BUI scale starts at zero and is open-ended. A rating above 40 is high, above 60 is extreme.

FWI (Fire Weather Index)
Information from the ISI and BUI is combined to provide a numerical rating of fire intensity - the Fire Weather Index. The FWI indicates the likely intensity of a fire.

The FWI is divided into four fire danger classes:

Low 0 - 7 Moderate 8 - 16 High l7 - 31 Extreme 32+

FFDC (Forest Fire Danger Code)
Based on predicted generated "fire intensity (kw/m²)" in forest type vegetation (pine, beech). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

SFDC (Scrub Fire Danger Code)
Based on predicted generated "fire intensity (kw/m²)" in scrub type vegetation (manuka, gorse, broom). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

GFDC (Grass Fire Danger Code)
Based on predicted generated "fire intensity (kw/m²)" in grass type vegetation (dry grass, tussock). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

BKDI (Byram-Keetch Drought Index)
Current Byram-Keetch Drought Index. [mm]. (This is identical to the KBDI.) Consider the topmost layers of soil such that their field capacity is 200 mm of available water. The index estimates how much effective rainfall is needed to saturate this depth of soil at any time. Moisture is lost from the soil only by evaporation due to temperature effects. The first 5 mm of rainfall is lost to the canopy. There is a problem if any of the rainfall is lost as surface run-off.

FFM
Forest Fuel Moisture

FFH
Forest Flame Height

GROS
Grass Rate Of Spread

DF
Drought Factor

ANGSTROM INDEX (Angstrom Index)
The Angtstrom Index (Angstrom) is used primarily in Sweden, it uses the air temperature and relative humidity to calculate a numerical index of fire danger. That number is then equated to the Fire Danger severity of either Extreme, High, Moderate, or Low. It is based solely on weather conditions, with no adjustment for fuel moisture. The lower the number, the higher the fire risk.
Angstrom Index = (H/ 20)+ ((29 ?T) /10)
H = Relative Humidity as % (0-100)
T = Temperature in Degrees Celcius.
     > 4.0  Fire occurrence unlikely
4.0 - 2.5  Fire conditions unfavourable
2.5 - 2.0  Fire conditions favourable
     < 2.0  Fire occurrence very likely


CBI (Chandler Burning Index)
The Chandler Burning Index is a Fire Rating System primarily used in North America. The Chandler Burning Index (CBI) uses the air temperature and relative humidity to calculate a numerical index of fire danger. That number is then equated to the Fire Danger severity of either extreme, very high, high, moderate, or low. It's based solely on weather conditions, with no adjustment for fuel moisture.
Warning
IMPORTANT: DO NOT USE THIS INFORMATION FOR MAKING DECISIONS.

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