tion column over bumed area meant an increase in windspeed could 

 have a prompt influence on rate of fire spread at the boundaries. 



Weather. Free-atmosphere conditions at 5,000 ft.: Winds 20 m.p.h. 

 SW; relative humidity 27 percent; dry-bulb temperature 77° F. 



1400. Fire advancing to northeast; mainly ground fire. 



Weather. Free-atmosphere conditions at 5,000 ft.: Winds 21 m.p.h. 

 SW; relative humidity 25 percent; dry-bulb temperature 78° F. 



Rate of spread. 0.75 m.p.h. 



Fuels. Main fire front: 20-percent ground +7 5-percent brush 

 +10-percent crown. 



Intensity. Maximum energy release rate from total front: 53 X 10* 

 B.t.u./sec; fire intensity: 1,000 B.t.u./sec.-ft. 



1500, Fire has advanced to ridge southwest of Jeru Peak; main front brush 

 and crown fire. 



Weather. Free-atmosphere conditions at 5,000 ft.: Winds 24 m.p.h. 

 SW; relative humidity 22 percent; dry-bulb temperature 78° F. 



Rate of spread. 1.25 m.p.h. 



Fuels. Main fire front: 20-percent ground +90-percent brush 

 +40-percent crown. 



Intensity. Maximum energy release rate: 100 X 10* B.t.u./sec; fire 

 intensity: 5,400 B.t.u./sec.-ft. 



1600. Fire at Selkirk Divide; ground fire lagging main front, brush sustaining 

 crowning fire. 



Weather. Free-atmosphere conditions at 5,000 ft.: Winds 25 m.p.h. 

 SW; relative humidity 20 percent; dry-bulb temperature near 77° F. 



Rate of spread. 1.6 m.p.h. 



Fuels. Main front: 10-percent groxmd +95-percent brush +80-percent 

 crown. 



Intensity. Maximum energy release rate: 145 X 10* B.t.u./sec; fire 

 intensity: 6,900 B.t.u./sec.-ft. 



1700. Fire moving slowly across Divide; convection column 25,000 ft. high. 



Weather. Free-atmosphere conditions at 5,000 ft.: Winds 29 m.p.h. 

 SW; relative humidity 20 percent; dry-bulb temperature 75° F. 



Rate of spread. Less than 1 m.pJi. 



Fuels. Main fire front: 30-percent ground +85-percent brush 

 +20-percent crown. 



14 



