Fitness figure

From Glossary of Meteorology



fitness figure

(Also called fitness number.) In the United Kingdom, a measure of the fitness of the weather at an airport for the safe landing of aircraft.

The figure F is computed on the basis of corrected values of visibility and cloud height. Observed visibility is adjusted according to intensity of precipitation; and cloud height is corrected for height of nearby obstructions and cloud amount. Further corrections are applied for the cross- runway component of the wind. The most comparable device widely used in the United States is the sliding scale of ceiling and visibility.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.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.