FUEL MOISTURE INDEX (FMI)

The Fuel Moisture Index (FMI) is very basic but showed in a study presented by its developer Sharpes a very good performance in comparison with other fuel moisture indices. It uses the air temperature and relative humidity to calculate a numerical index of fire danger. No fire danger classification exists for this index. The lower the number, the higher the fire risk.

FMI = 10 - 0.25 (T - H)

where:
H = Relative Humidity as % (0-100)
T = Temperature in Degrees Celcius.