手法を比較

	火災気象指数	キッチ・バイラム干ばつ指数
分野	林学	林学
系統	Process / pipeline	Process / pipeline
提唱年	1987	1968
提唱者	Cornelius Van Wagner	John Keetch
種類	weather-based fire danger system	drought index
原典	Van Wagner, C. E. (1987). Development and structure of the Canadian Forest Fire Weather Index System. Canadian Forestry Service Publication 1333.	Keetch, J. J., & Byram, G. M. (1968). A drought index for forest fire control. Research Paper SE-38, USDA Forest Service Southeastern Forest Experiment Station.
別名	FWI, Canadian Fire Weather Index	KBDI, drought severity index
関連	2	2
概要	The Fire Weather Index (FWI) System, developed by the Canadian Forest Service, is a comprehensive weather-based fire danger rating system consisting of six component indices and an overall Fire Weather Index. It uses daily weather observations (temperature, relative humidity, wind speed, and precipitation) to estimate fine-fuel moisture, fire behavior, and risk. The FWI System is used operationally across Canada, many U.S. states, and internationally for fire management decisions and fire danger forecasting.	The Keetch-Byram Drought Index (KBDI) is a cumulative drought severity index used in fire danger rating systems to track long-term soil moisture depletion and drying trends. Developed in 1968 by Keetch and Byram, KBDI integrates daily temperature, precipitation, and prior drought state to produce a continuous index ranging from 0 (no drought, moist soil) to 800 (severe drought, very dry soil). KBDI is widely used in fire danger prediction and fire behavior modeling because soil moisture is a major driver of fuel drying and flammability.