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Chandler Burn Index*



CURRENT FIRE RISK IS 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.

Image shows current CBI Fire Danger, Current Temp, Humidity, CBI rating, CBI spread component and intensity component.


*This implementation of the Chandler Burning Index uses the current air temperature and relative humidity to create a numerical index of fire danger.
Then the numerical value is used to determine a fire danger adjective. CBI 0-50 = LOW, 50-75 = MODERATE, 75-90 = HIGH, 90-97.5 = Very HIGH, and >97.5 = EXTREME.
The CBI is linearly sensitive to temperature, but exponentially sensitive to RH, so a small change in RH can make a big change in the CBI number.

See FWI for rain, drought, wind effects



Regional Fire Risk Assessment

Red Flag Risk Red Flag Warnings

Observed and Forecast Fire Risk

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National Fire Risk National Fire Risk

SANTA ANA WILDFIRE THREAT INDEX

Drought/Rain

ElementValueDescription
Drought (FWI) 623 Drought: Extreme
Rain Today0.00
Rain Month2.34
Rain Year2.34From July 1
Days No Rain3Days
Record No Rain38Days (Station records 2004 to Present)
Last Rain1/19/2018