a numeric rating of the moisture content of litter and other cured fine fuels. This code is an indicator of the relative ease of ignition and the flammability of fine fuel.
a numeric rating of the average moisture content of deep, compact organic layers. This code is use indicator of seasonal drought effects on forest fuels and the amount of smoldering in deep duff layers and large logs.
a numeric rating of the expected rate of fire spread. It combines the effects of wind and FFMC on rate of spread without the influence of variable quantities of fuel.
