· Burning Index: Describes the potential amount of effort needed to contain a single fire in a particular fuel type within a rating area. Based on a combination of the Spread and Energy Release Component.
· Spread Component: Rating of the forward rate of spread of a headfire (feet/min).
· Ignition Component: A number which relates the probability that a fire will result if a firebrand is introduced into a fine fuel complex. The ignition component can range from 0 when conditions are cool and damp, to 100 on days when the weather is dry and windy. Theoretically, on a day when the ignition component registers a 60 approximately 60% of all fire brands that come into contact with wildland fuels will require suppression action.
· Energy Release Component: A number related to the available energy (BTU) per unit area (square foot) within the flaming front at the head of a fire. Daily variations in ERC are due to changes in moisture content of the various fuels present, both live and dead. Since this number represents the potential “heat release per unit area “in the flaming zone, it can provide guidance to several important fire activities. It may also be considered a composite fuel moisture value as it reflects the contribution that all live and dead fuels have to potential fire intensity