Spot fire distance equations for pocket calculators
Document Type: Book
Author(s): C. H. Chase
Publication Year: 1981

Cataloging Information

  • Abies balsamea
  • Abies grandis
  • Abies lasiocarpa
  • cover
  • fire management
  • firebrands
  • firing techniques
  • flame length
  • forest management
  • heavy fuels
  • Idaho
  • ignition
  • Montana
  • Nevada
  • Picea engelmannii
  • Pinus contorta
  • Pinus monticola
  • Pinus ponderosa
  • Pseudotsuga menziesii
  • size classes
  • slash
  • spot fires
  • statistical analysis
  • Texas
  • Utah
  • Wyoming
Record Maintained By:
Record Last Modified: August 1, 2018
FRAMES Record Number: 38784
Tall Timbers Record Number: 13397
TTRS Location Status: In-file
TTRS Call Number: Fire File DDW
TTRS Abstract Status: Fair use, Okay, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.


This note presents equations for calculating maximum spot fire distance from firebrand sources in the Intermountain West based on prevailing windspeed, vegetation cover, and terrain in the area. The equations include the capability to predict spotting distance from a torching tree(s) or from a continuous flame source such as slash piles or jackpots of heavy fuels. The equations can be used on a programmable pocket calculator. Potential uses are seen in fire management planning and realtime fire behavior predictions. For copies of a program for the Texas Instruments T1-59, send seven blank TI-59 magnetic cards to the author.

Chase, C. H. 1981. Spot fire distance equations for pocket calculators. Research Note INT-310. Ogden, UT, USDA Forest Service, Intermountain Forest and Range Experiment Station.