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Local Wx Station Data Sacramento, Northern Sierra Nevada & the Motherlode Area Current Weather Conditions
Fire Behavior Index (ISI)
Fire Behavior Index (ISI)
The ISI measures the expected rate of fire spread based on wind speed and fine fuel moisture. Higher values indicate faster spreading fire.
Color Value Category Description
 0 – 5Very LowSlow spread. Fire easily controlled.
 6 – 10LowModerate spread under dry conditions.
 11 – 20ModerateRapid spread. Increasing suppression difficulty.
 21 – 30HighVery rapid spread. Difficult to control.
 30+ExtremeExplosive spread. Extreme fire behavior.






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