Fire size and shape at 1400 hours, 4/18/65. 



Fire size and shape at 1430 hours, 4/18/65. 

 Measured fire size is 243 acres. 



Fire size and shape at 1500 hours. 

 /Vleasured fire size is 485 acres. 

 Fastest spread rates have occurred. 



Fire size and shape at 1600 hours. 

 Measured fire size is 756 acres. 



Figure 10.— The Hellgate Fire exhibited high spread rates with crowning and spotting. 

 Passage of weather fronts after 1600 hours caused spread in several directions, 

 eliminating further use of the fire shape model, April 18, 1965. Dotted fire shapes are 

 computer estimates and solid lines are observations. 



12 



