Fire Danger Rating

 Chandler Burning Index (CBI) - Fire Danger Rating
Current Chandler Burning Index: LOW (19.34) Chandler Burning Index: 19.34 (on a scale of 100)
Fire Danger: LOW

Chandler Burning Index Description

 Fire Weather Index

Weather data for the Fire Weather Index calculations is captured daily (at 12:00 PDT) by the Davis Vantage Pro2 Plus Weather Station located on the northern slopes of Mount Tzouhalem. The Fire Weather results shown above are derived using the SoftRock designed application called FWI Calc.

Daily FWI Data - Updated: 09/16/2017 12:02:03
Date Temp
ºC
Humidity
%
Wind
kmph
Rain
mm
FFMC DMC DC ISI BUI FWI FFDC SFDC GFDC CBI CBI DC
09/16/2017 16.8 46 9.1 0.00 87.9 72 723 5.0 115 20.8 EX EX LW 23.9 LW
Legend: LW = Low, MD = Moderate, HI = High, VH = Very High, EX = Extreme

 FWI Data of the past 8 days
FWI data for the past 14 days
DateTemp
ºC
Humidity
%
Wind Speed
kmph
Rainfall
mm
FFMCDMCDCISIBUIFWIFWI DC
09/16/201716.8469.10.0087.9727235.011520.8HI
09/15/201717.0386.70.0087.9707184.411218.7HI
09/14/201716.9496.50.0084.7687142.810913.1MD
09/13/201715.7707.20.0079.6667091.61078.1MD
09/12/201718.9714.90.0074.9657041.01065.2MD
09/11/201715.6756.40.0064.1646990.71043.5LW
09/10/201712.8916.50.6048.3636950.21030.6LW
09/09/201715.5813.75.0041.1636910.11020.3LW
09/08/201719.2820.02.0062.7997190.51483.0LW
09/07/201721.0693.60.0086.51177143.116616.7HI
09/06/201724.0540.00.0089.11167083.716518.9HI
09/05/201727.2435.60.0089.51147025.316224.4VH
09/04/201725.1517.90.0087.91106964.715822.3VH
09/03/201723.6559.20.0086.81086904.315520.8HI
Legend: LW = Low, MD = Moderate, HI = High, VH = Very High, EX = Extreme

Fire Weather Statistics
Stat Temp
ºC
Humidity
%
Wind
kmph
Rain
mm
FFMC DMC DC ISI BUI FWI CBI
HIGHS 32.8
07/09/2010
100
03/27/2016
27.4
11/06/2014
43.00
10/14/2016
91.6
08/16/2010
121
08/12/2017
1095
09/14/2014
6.5
06/26/2017
166
09/07/2017
24.4
09/05/2017
68.7
08/14/2010

LOWS -5.0
12/17/2016
28
08/14/2010
0.0
09/08/2017
0.00
09/16/2017
0.0
10/28/2014
0
04/21/2017
0
03/10/2017
0.0
06/16/2017
0
04/21/2017
0.0
06/16/2017
-2.6
01/20/2012

Fire Weather Network - World

Index Definitions
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)

The BUI 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 to 7 - Moderate: 8 to 16 - High: l7 to 31 Extreme: 32+

FFDC (Forest Fire Danger Code)

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

SFDC (Scrub Fire Danger Code)

Based on predicted generated "fire intensity (kw/m²)" in scrub type vegetation. This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Values: Low, Moderate, High, Very High, Extreme)

GFDC (Grass Fire Danger Code)

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

CBI (Chandler Burning Index)

The Chandler Burning Index (CBI) uses the air temperature and relative humidity to calculate a numerical index of fire danger. It is based solely on weather conditions, with no adjustment for fuel moisture. That number is then equated to an «Adjective Fire Danger Severity» of either low (less than 50), moderate (between 50 and 75), high (between 75 and 90), very high (between 90 and 97.5), or extreme (above 97.5).

Chandler Burning Index Description