This section presents the daily values of the Fire Weather Index (FWI), calculated using hourly ERA5 reanalysis data and the improved local solar-noon method (SN), developed at the ESCER Centre. The daily FWI values depend on the hourly conditions of temperature, relative humidity, wind speed, and 24-hour accumulated precipitation observed at local solar noon (the time when the sun is at its zenith). The calculations are initialized at the beginning of the fire season (determined by snow and temperature conditions) and continue until the end of the season (determined solely by temperature conditions).
FWI calculation methodology
Data access
Daily FWI values map and comparison with the data from the CWFIS observation stations
Date: Last date computed =
Please note that the FWI values corresponding to the CWFIS* station data (points on the map) were calculated using the classical method (conditions at local noon), whereas the FWI values shown in the map background and derived from ERA5 were calculated using the local solar-noon method.
*CWFIS: Canadian Wildland Fire Information System