44.8 °F
25.8 %

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.

CBI < 50 Low
50 < CBI < 75 Moderate
75 < CBI < 90 High
90 < CBI < 97,5 Very high
CBI > 98 Extreme

65

Boulder

Current risk


50 < CBI < 75

Moderate


Fires can start from most accidental causes but, with the exception of lightning fires in some areas, the number of starts is generally low. Fires in open cured grasslands will burn briskly and spread rapidly on windy days. Timber fires spread slowly to moderately fast. The average fire is of moderate intensity, although heavy concentrations of fuel, especially draped fuel, may burn hot. Short-distance spotting may occur, but is not persistent. Fires are not likely to become serious and control is relatively easy.



Formula --> CBI = (((110 - 1.373 * RH) - 0.54 * (10.20 - T)) * (124 * 10(-0.0142 * RH)))/60
T = Air temperature [°C] / RH = Relative humidity [ %]
Application --> CBI = (((110 - 1.373 * 25.8 ) - 0.54 * (10.20 - 7.11111)) * (124 * 10(-0.0142 * 25.8 )))/60 ≅ 65


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