Skip to Main Content
The national fire-danger rating system: basic equationsAuthor(s): Jack D. Cohen; John E. Deeming
Source: Gen. Tech. Rep. PSW-82. Berkeley, CA: Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture; 16 p
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
View PDF (480 KB)
DescriptionUpdating the National Fire-Danger Rating System (NFDRS) was completed in 1977, and operational use of it was begun the next year. The System provides a guide to wildfire control and suppression by its indexes that measure the relative potential of initiating fires. Such fires do not behave erratically–they spread without spotting through continuous ground fuels. Estimates of fire potential have a basis in the mathematical models used for fire behavior. The fire manager must select the fuel model that best represents the fuels in the protection area. Among the 20 fuel models available, not more than two or three are appropriate for any one area. This documentation of the 20 fuel models and their equations supplements previous reports on the System. The equations are presented in the coded format of FORTRAN and BASIC computer languages.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCohen, Jack D.; Deeming, John E. 1985. The national fire-danger rating system: basic equations. Gen. Tech. Rep. PSW-GTR-82. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 16 p.
Keywordsfire modeling, fire occurrence, fire-danger indexes, forest-fire hehavior, forest-fire risk, fuel moisture, fuel models.
- Aids to determining fuel models for estimating fire behavior
- Modeling wind adjustment factor and midflame wind speed for Rothermel's surface fire spread model
- Fire-danger rating and observed wildfire behavior in the Northeastern United States.
XML: View XML