Sailing Glossary - Term Fire-danger meter

A graphical aid used in fire weather forecasting to calculate the degree of forest-fire danger (or burning index). Commonly in the form of a circular slide rule, the fire-danger meter relates numerical indices of (a) the seasonal stage of foliage, (b) the cumulative effect of past precipitation or lack thereof, (c) the measured fuel moisture, and (d) the speed of the wind in the woods.