Fire Danger Forecast

The fire danger forecast module of GWIS provides daily maps of 1 to 10 days of forecasted fire danger level using numerical weather predictions to compute the Fire Weather Index (FWI) (Van Wagner and Pickett, 1985).

GWIS operates using meteorological forecast data received daily from the European Centre for Medium-Range Weather Forecast (ECMWF).

Fire danger is mapped in 6 classes (very low, low, medium, high, very high and extreme) with a spatial resolution of about 16 km (ECMWF data).  At the moment, the fire danger classes are the same for all countries and maps show a harmonized view of the spatial distribution of fire danger level; however, given the different climatic conditions at the global level, calibration of the FWI values in different regions and publication of FWI anomalies will be provided soon in GWIS.

The following are the FWI values used as thresholds of the fire danger classes in the map:  

Fire Danger Classes FWI ranges
(upper bound excluded)
Very low < 5.2
Low  5.2 - 11.2
Moderate  11.2 - 21.3
High  21.3 - 38.0
Very high  38.0 - 50.0
Extreme >= 50.0


Van Wagner, C.E., Pickett, T.L. 1985, Equations and FORTRAN program for the Canadian Forest Fire Weather Index System. Can. For. Serv., For. Rech. Rep. 33 18 p.