The Ignition Component (IC) is 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 value is 0 a single firebrand will not start a Wildland fire requiring suppression action.
A value of 50, there is a 50% probability a single firebrand could start a wildfire requiring suppression action.
And when the value is 100, there is a 100% probability a wildfire will result from a single firebrand that will require suppression action to stop the fire from spreading in wildland fuels.