Fire Burning Index 1 : A system of estimating the relative degree of forest fire danger by taking into account factors including wind, temperature, relative humidity, days since rainfall, etc
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}