From Glossary of Meteorology
- A device for combining ratings of several variable factors into numerical classes of fire danger.
- 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 1) the seasonal stage of foliage, 2) the cumulative effect of past precipitation or lack thereof (buildup index), 3) the measured fuel moisture, and 4) the speed of the wind in the woods. The fuel moisture is determined by weighing a special type of wooden stick that has been exposed in the woods, its weight being proportional to its contained water.
Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact firstname.lastname@example.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.