189  
FNUS75 KBOI 112317  
FWSBOI  
 
SPOT FORECAST FOR BUCKHORN...SOUTH IDAHO  
NATIONAL WEATHER SERVICE BOISE ID  
517 PM MDT FRI SEP 11 2026  
 
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON SEPTEMBER 11.  
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.  
   
..INCREASED WINDS SATURDAY FOLLOWED BY FRONTAL PASSAGE SUNDAY
 
   
..MUCH COOLER WITH HIGHER HUMIDITY ON SUNDAY
 
 
   
DISCUSSION
 
 
WARM AND DRY CONDITIONS WITH LOW RHS CONTINUE THROUGH SATURDAY.  
WINDS WILL STEADILY INCREASING FROM THE SOUTHEAST/SOUTHWEST SATURDAY  
AFTERNOON THROUGH EVENING WITH RIDGE GUSTS AROUND 25-30 MPH. A COLD  
FRONTAL PASSAGE LATE SUNDAY MORNING WILL BRING WINDS TO WESTERLY AND  
REMAIN GUSTY THROUGH THE EARLY EVENING. TEMPERATURES WILL DROP ABOUT  
20 DEGREES FROM SATURDAYS HIGHS, INCREASING MIN RHS.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR.  
MIN TEMPERATURE.....43 TO 50.  
MAX HUMIDITY........42 TO 48 PERCENT.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......SHIFTING TO THE EAST/SOUTHEAST 3 TO 6 MPH AFTER  
SUNSET.  
MIXING HEIGHT.......200 FT AGL.  
TRANSPORT WINDS.....EAST AROUND 10 MPH.  
VENTILATION INDEX...20 POOR.  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY IN THE MORNING THEN BECOMING  
MOSTLY CLOUDY IN THE AFTERNOON.  
MAX TEMPERATURE.....66 TO 71.  
MIN HUMIDITY........18 TO 25 PERCENT.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......SOUTHEASTERLY 4 TO 8 MPH IN THE MORNING. SHIFTING  
TO SOUTHWEST 8 TO 18 MPH, WITH GUSTS TO 25-30 MPH  
FOR EXPOSED AREAS AND RIDGE TOPS IN THE AFTERNOON.  
MIXING HEIGHT.......7500 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.  
VENTILATION INDEX...1125 EXCELLENT.  
   
SATURDAY NIGHT
 
 
SKY/WEATHER.........CLOUDY.  
MIN TEMPERATURE.....42 TO 48.  
MAX HUMIDITY........64 TO 71 PERCENT.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......SOUTHEAST 11 TO 18 MPH WITH GUSTS TO AROUND 25-30  
MPH FOR EXPOSED AREAS AND RIDGE TOPS OVERNIGHT.  
MIXING HEIGHT.......400 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST AROUND 15 MPH.  
VENTILATION INDEX...60 POOR.  
   
SUNDAY
 
 
SKY/WEATHER.........PARTLY SUNNY IN THE MORNING, THEN CLEARING.  
MAX TEMPERATURE.....48 TO 54. MUCH COOLER.  
MIN HUMIDITY........30 TO 37 PERCENT. HIGHER.  
CWR.................0 PERCENT.  
WIND - 20 FOOT......TRANSITIONING TO SOUTHWEST 4 TO 10 MPH IN THE MORNING,  
THEN, WEST 10 TO 19 MPH WITH GUSTS TO AROUND 25-35 MPH  
FOR EXPOSED AREAS AND RIDGES IN THE AFTERNOON.  
MIXING HEIGHT.......5500 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 15 MPH.  
VENTILATION INDEX...825 EXCELLENT.  
 

 
FORECASTER...HENRY  
REQUESTED BY...T. MOUNCE  
TYPE OF REQUEST...WILDFIRE  
.TAG 2621688.0/BOI  
.DELDT 09/11/26  
.FORMATTERVERSION 2.0.0  
.EMAIL IDSCC@FIRENET.GOV  
 
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