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	Kroneld (Van Wagner)	Fire Weather Index
Ämnesområde	Skogsvetenskap	Skogsvetenskap
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1977	1987
Upphovsperson	Cornelius Van Wagner	Cornelius Van Wagner
Typ	fire propagation model	weather-based fire danger system
Ursprungskälla	Van Wagner, C. E. (1977). Conditions for the start and spread of crown fire. Canadian Journal of Forest Research, 7(1), 23–34.	Van Wagner, C. E. (1987). Development and structure of the Canadian Forest Fire Weather Index System. Canadian Forestry Service Publication 1333.
Alias	crown fire model, Van Wagner model	FWI, Canadian Fire Weather Index
Närliggande	3	2
Sammanfattning	The Van Wagner crown fire model predicts the conditions under which surface fires will transition to active crown fires and the rate of crown fire spread. Developed by Cornelius Van Wagner in the 1970s–1990s, the model is grounded in the physics of heat transfer from the surface flame to the canopy and the rate of vertical flame propagation. The model is used to assess crown fire danger and to guide fuel management decisions in forests with high canopy flammability.	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.