Program for Climate, Ecosystem and Fire Applications

Global FWI Monthly Forecast


CFSv2 Forecast Grid Initialization: 2022/06/26


30-day Forecast Means
Fire Weather Index LoopGrid26Jun26Jul25Aug24Sep24Oct23Nov23Dec22Jan21Feb
Fire Weather Index Anomaly LoopGrid26Jun26Jul25Aug24Sep24Oct23Nov23Dec22Jan21Feb
Fire Weather Index Standardization LoopGrid26Jun26Jul25Aug24Sep24Oct23Nov23Dec22Jan21Feb

This product supports the GOFC-GOLD Global Early Warning System for Wildland Fires. Mean values of the Canadian Fire Weather Index (FWI) have been derived from the Climate Forecast System Version 2.0 (CFSv2) model single runs. 30-day mean values of FWI are computed in the following manner: 4x daily data (of temperature, relative humidity, wind speed, and precipitation) are first interpolated to hourly; local noon values and rainfall accumulation are then used to derive daily values of FWI using equations from Van Wagner (1985); daily values of FWI are then averaged over a 30-day period. FWI anomalies represent the subtraction of the 30-year FWI climatology from the current 30-day FWI mean values, averaged for the corresponding time periods. The FWI climatology is computed in the same manner described above, although input variables (temperature, relative humidity, wind speed, and precipitation) are taken from 30-year CFSv2 daily climatologies. FWI standardized values represent the anomalies divided by the standard deviation. This product is updated on each Sunday of the month. NOTE: This product does not include a snow cover factor; thus, FWI values may not be representative during winter months.
CFSv2 information and seasonal climate forecasts