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Wairoa Head
Fire Danger Warning Index

The following is the FWI Data from the Wairoa Weather Station,
Hawkes Bay, New Zealand. Southern Hemisphere.
Last Updated: 16/12/2017 6:15:53 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
6.2 2.5 17.1 2.5 65 1.7 398 41 23.5 82.1 2.8 m 75.9 km/h 15.7 2.8 5 0

Month CBI/Danger Code
11.7    LW
Fire Danger Levels Index
Low
Moderate
High
Very High
Extreme
DateTemp
ºC
Humidty
%
Wind Spd
kmph
Rainfall
mm
FFMCDMCDCISIBUIFWI DCFFDI DCCBI DCFMI
16/12/201722.4683.60.0082.1413981.765LOWLOW MODLOW17.1
15/12/201722.6537.20.0078.0393901.362LOWLOW MODLOW16.0
14/12/201720.7613.68.1055.3363830.359LOWLOW MODLOW18.1
13/12/201725.1503.60.0089.2634044.690MODERATELOW MODLOW16.8
12/12/201724.2552.50.0089.2603964.387MODERATELOW MODLOW14.4
11/12/201727.5490.00.0090.4573894.583MODERATELOW MODLOW13.2
10/12/201728.84113.30.0090.4543808.879HIGHLOW MODLOW12.4
9/12/201727.3433.60.0089.3493724.674MODERATELOW MODLOW13.8
8/12/201727.3577.20.0087.2463634.170MODERATELOW MODLOW14.8
7/12/201723.9575.00.0086.3433553.266MODERATELOW MODLOW18.1
6/12/201721.1787.20.0084.8403472.963MODERATELOW MODLOW23.4
5/12/201728.5471.10.0088.7393403.761MODERATELOW MODLOW11.4
4/12/201724.0687.20.0086.7363323.856MODERATELOW MODLOW12.8
3/12/201725.9533.60.0087.7343243.754MODERATELOW MODLOW12.9
2/12/201725.5536.10.0087.2313163.950MODERATELOW MODLOW15.6
1/12/201724.26512.20.0084.9283083.846MODERATELOW MODLOW17.6
30/11/201720.78213.30.0082.9263003.143MODERATELOW MODLOW21.3
29/11/201722.1721.10.0083.5252941.842LOWLOW MODLOW20.9
28/11/201721.5746.10.0083.1242872.239LOWLOW MODLOW17.7
27/11/201721.4745.00.0082.8222812.037LOWLOW MODLOW24.0
26/11/201719.9817.20.0082.0212752.035LOWLOW MODLOW24.9
25/11/201718.7847.20.0082.0202692.034LOWLOW MODLOW23.1
24/11/201722.2535.00.0082.8202632.033LOWLOW MODLOW17.7
23/11/201718.87511.20.0072.0172571.229LOWLOW MODLOW20.7
22/11/201718.3756.13.3057.0162510.427LOWLOW MODLOW19.2
21/11/201715.38619.40.6070.8202511.734LOWLOW MODLOW24.8
20/11/201715.18417.32.1064.6202451.233LOWLOW MODLOW24.9
19/11/201714.98323.40.3078.9222403.336LOWLOW MODLOW26.1
18/11/201715.07618.40.3077.2212352.235LOWLOW MODLOW26.0
17/11/201721.4469.75.1070.1212301.034LOWLOW MODLOW14.8
16/11/201721.1577.20.0083.1282342.343LOWLOW MODLOW17.9

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:  1525.20 mm        Rain Days:  158        Drought Days:  192        Day Rainfall High  198.90 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
32.3
99
58.0
93.9
160
663
23.3
199
51.1
76.4
0.8
8.4
18.7
9.4
8
36
31/01/2017
9/10/2017
14/07/2017
31/01/2017
7/02/2017
7/02/2017
13/02/2017
7/02/2017
19/01/2017
11/01/2017
11/01/2017
11/01/2017
19/01/2017
13/02/2017
26/04/2017
5/03/2017
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
7.3
22
0.0
1.5
0
1
0.0
0
0.0
-2.0
6.5
31.6
0.0
0.0
0
0
12/07/2017
26/01/2017
11/12/2017
28/05/2017
5/08/2017
9/07/2017
10/10/2017
5/08/2017
10/10/2017
9/07/2017
2/08/2017
9/07/2017
3/09/2017
11/11/2017
3/09/2017
16/12/2017

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:  198.90 mm  22/03/2017  (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
33.3
100
58.0
93.9
160
663
23.9
199
51.1
83.0
0.8
8.4
22.3
9.4
10
177
26/02/2016
31/12/2011
14/07/2017
31/01/2017
7/02/2017
7/02/2017
24/07/2016
7/02/2017
19/01/2017
22/01/2016
11/01/2017
11/01/2017
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
22
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
26/01/2017
11/12/2017
31/12/2011
5/08/2017
25/07/2011
10/10/2017
5/08/2017
10/10/2017
8/07/2015
8/07/2015
8/07/2015
N/A
11/11/2017
3/09/2017
16/12/2017
FWI-Temperature
FWI-Rainfall Fire Risk
Fire Risk:   Low
Current Open Air Fire Bans: No




Open Air Fire Ban for both Urban and Rural areas in place from the 8th of January until further notice. 'No person shall light a fire in the open air, including incinerators, without having first obtained a written fire permit from the Wairoa District Council'.

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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