409  
FNUS75 KBOI 192016  
FWSBOI  
 
SPOT FORECAST FOR BOX...BLM  
NATIONAL WEATHER SERVICE BOISE ID  
216 PM MDT TUE AUG 19 2025  
 
FORECAST IS BASED ON FORECAST START TIME OF 0600 MDT ON AUGUST 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (208)334-9060, IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
..HOT AND DRY WITH BREEZY AFTERNOON WINDS THROUGH FRIDAY  
 
   
DISCUSSION  
 
SOME CUMULUS DEVELOPMENT WILL CONTINUE TO BRING PARTLY CLOUDY  
SKIES THIS AFTERNOON. HOT AND DRY CONDITIONS WILL CONTINUE THROUGH  
THE WORK WEEK, WITH BREEZY AFTERNOON NORTHWESTERLY WINDS AND  
BRIEF RELATIVE HUMIDITY VALUES IN THE LOW TEENS TOMORROW AND  
THURSDAY. SCATTERED SHOWERS AND THUNDERSTORMS WILL MOVE INTO THE  
REGION IN A SIGNIFICANT PATTERN SHIFT THIS WEEKEND.  
   
WEDNESDAY  
 
SKY/WEATHER.........PARTLY CLOUDY WITH AFTERNOON CUMULUS DEVELOPMENT.  
MAX TEMPERATURE.....87 TO 92.  
MIN HUMIDITY........16 TO 21 PERCENT.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......WEST 4 TO 10 MPH. GUSTS UP TO 18 MPH IN THE  
AFTERNOON.  
MIXING HEIGHT.......9500 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 15 MPH.  
VENTILATION INDEX...1425 EXCELLENT.  
   
WEDNESDAY NIGHT  
 
SKY/WEATHER.........MOSTLY CLEAR.  
MIN TEMPERATURE.....53 TO 59.  
MAX HUMIDITY........45 TO 50 PERCENT.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......NORTH 6 TO 10 MPH. GUSTS UP TO 16 MPH IN THE  
EVENING.  
MIXING HEIGHT.......200 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 10 MPH.  
VENTILATION INDEX...20 POOR.  
   
THURSDAY  
 
SKY/WEATHER.........PARTLY CLOUDY WITH AFTERNOON CUMULUS DEVELOPMENT.  
MAX TEMPERATURE.....90 TO 95.  
MIN HUMIDITY........11 TO 18 PERCENT.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......NORTH AROUND 6 MPH.  
MIXING HEIGHT.......8500 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 10 MPH.  
VENTILATION INDEX...850 EXCELLENT.  
 
 
FORECASTER...ADAMS  
REQUESTED BY...IDAHO TEAM 1  
TYPE OF REQUEST...WILDFIRE  
.TAG 2520243.0/BOI  
.DELDT 08/20/25  
.FORMATTERVERSION 2.0.0  
.EMAIL 2025.BOX.PLANS@FIRENET.GOV  
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