566  
FNUS75 KBOI 101952  
FWSBOI  
 
SPOT FORECAST FOR BIG CREEK PILES...USFS  
NATIONAL WEATHER SERVICE BOISE ID  
152 PM MDT FRI OCT 10 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 1400 MDT ON OCTOBER 10.  
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.  
 
...CHANCE OF SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON...  
 
...FRONTAL PASSAGE TONIGHT WITH CONTINUED CHANCE OF SHOWERS SATURDAY...  
   
DISCUSSION
 
 
A LOW PRESSURE SYSTEM OFF THE PACIFIC NORTHWEST COAST WILL KEEP  
GUSTY SOUTHERLY WINDS AT THE BURN SITE THROUGH THIS EVENING.  
RIDGETOPS WILL SEE GUSTY SOUTHWEST WINDS, WITH WINDS CHANNELING SOUTH  
TO NORTH THROUGH MOUNTAIN VALLEYS. SHOWERS AND POSSIBLE THUNDERSTORMS  
WILL DEVELOP LATE THIS AFTERNOON AHEAD OF A COLD FRONT. THE BEST  
CHANCE FOR SHOWERS WILL BE BETWEEN 5PM AND 11PM TODAY WITH THE  
THUNDERSTORM THREAT ENDING BY 8PM. NOT EXPECTING A WIND SHIFT WITH  
THE OVERNIGHT FRONTAL PASSAGE THOUGH SHOWERS AND THUNDERSTORMS COULD  
BRING GUSTY AND ERRATIC WINDS THROUGH THE EVENING. SNOW LEVELS WILL  
DROP TO 7500 FEET BY SATURDAY AFTERNOON, BUT ACCUMULATING SNOW WILL  
REMAIN ABOVE 8500 FEET. COLDER AIR ARRIVES SATURDAY NIGHT, DROPPING  
SNOW LEVELS TO AROUND 5000 FEET MSL. ACCUMULATION OF UP TO 3 IS  
EXPECTED SATURDAY NIGHT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY WITH A 20 PERCENT CHANCE OF  
SHOWERS AND THUNDERSTORMS. GUSTY AND ERRATIC  
WINDS ARE POSSIBLE FROM SHOWERS AND  
THUNDERSTORMS.  
MAX TEMPERATURE.....64 TO 69.  
MIN HUMIDITY........37 TO 42 PERCENT.  
CWR.................10 PERCENT.  
WIND - 20 FOOT......SOUTH 9 TO 15 MPH WITH GUSTS TO AROUND 24 MPH.  
MIXING HEIGHT.......7000 FT AGL.  
TRANSPORT WINDS.....SOUTH AROUND 30 MPH.  
VENTILATION INDEX...2100 EXCELLENT.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. RAIN SHOWERS LIKELY AND A  
SLIGHT CHANCE OF THUNDERSTORMS IN THE EVENING,  
THEN A CHANCE OF RAIN AND SNOW SHOWERS  
OVERNIGHT. CHANCE OF PRECIPITATION 60 PERCENT.  
SNOW LEVEL DROPPING TO 8000 FEET MSL. NO SNOW  
ACCUMULATION.  
MIN TEMPERATURE.....32 TO 37.  
MAX HUMIDITY........86 TO 91 PERCENT.  
CWR.................30 PERCENT.  
WIND - 20 FOOT......SOUTHWEST 5 TO 11 MPH WITH GUSTS TO AROUND 16  
MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR  
THUNDERSTORMS.  
MIXING HEIGHT.......700 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH.  
VENTILATION INDEX...70 POOR.  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. A CHANCE OF RAIN AND SNOW  
SHOWERS IN THE MORNING, THEN RAIN AND SNOW  
SHOWERS LIKELY IN THE AFTERNOON. CHANCE OF  
PRECIPITATION 70 PERCENT. SNOW LEVEL 7500 FEET  
MSL. LITTLE OR NO SNOW ACCUMULATION.  
MAX TEMPERATURE.....43 TO 51.  
MIN HUMIDITY........58 TO 63 PERCENT.  
CWR.................40 PERCENT.  
WIND - 20 FOOT......SOUTHWEST 5 TO 10 MPH WITH GUSTS TO AROUND 16  
MPH IN THE AFTERNOON.  
MIXING HEIGHT.......5000 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.  
VENTILATION INDEX...750 EXCELLENT.  
 

 
FORECASTER...GROENERT  
REQUESTED BY...LAUREL INGRAM  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2523297.1/BOI  
.DELDT 10/10/25  
.FORMATTERVERSION 2.0.0  
.EMAIL LAUREL.INGRAM@USDA.GOV  
 
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