Fire Danger Index
Chandler Burning Index (CBI)
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.
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CBI < 50
|
Low |
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50 < CBI < 75
|
Matig |
|
75 < CBI < 90
|
High |
|
90 < CBI < 97,5
|
Zeer hoog |
|
CBI > 98
|
Extreme |
|
188
Ekeren
|
Current risk
Fires start quickly, spread furiously, and burn intensely. All fires are potentially serious. Development into high intensity burning will usually be faster and occur from smaller fires than in the very high fire danger class. Direct attack is rarely possible and may be dangerous except immediately after ignition. Fires that develop headway in heavy slash or in conifer stands may be unmanageable while the extreme burning condition lasts. Under these conditions the only effective and safe control action is on the flanks until the weather changes or the fuel supply lessens.
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Formula --> CBI = (((110 - 1.373 * RH) - 0.54 * (10.20 - T)) * (124 * 10
(-0.0142 * RH)))/60
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T = Luchttemperatuur |
[°C]
|
/ |
RH = Relatieve vochtigheid |
[ %]
|
Application --> CBI = (((110 - 1.373 *
3.0 ) - 0.54 * (10.20 -
)) * (124 * 10
(-0.0142 * 3.0 )))/60 ≅
188
