870   
FNUS75 KBYZ 222316  
FWSBYZ  
  
SPOT FORECAST FOR WEST FORK...USFS  
NATIONAL WEATHER SERVICE BILLINGS MT  
516 PM MDT MON SEP 22 2025  
  
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON SEPTEMBER 22.   
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
  
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH   
THIS FORECAST.  
   
DISCUSSION  
  
PRECIPITATION WITH THE RECENT WEATHER SYSTEM HAS ENDED AND SKIES   
WILL CLEAR TONIGHT. WE ARE ENTERING AN EXTENDED PERIOD OF DRY AND   
WARM WEATHER, WHICH WILL LAST THROUGH THE WEEKEND. WINDS OVER THE   
NEXT SEVERAL DAYS WILL BE TERRAIN-DRIVEN AND GENERALLY LIGHT.  
   
TONIGHT  
  
SKY/WEATHER.........CLEARING.   
CWR.................0 PERCENT.   
CHANCE OF LIGHTNING.0 PERCENT.   
MIN TEMPERATURE.....26-30.   
MAX HUMIDITY........GREATER THAN 95 PERCENT.   
WIND (20 FT)........   
 SLOPE/VALLEY.......NORTH 5-10 MPH BECOMING DOWNSLOPE/DOWNVALLEY  
                    2-5 MPH AFTER SUNSET.   
 RIDGETOP...........NORTH AROUND 10 MPH.   
MIXING HEIGHT.......DECREASING TO 300 FT AGL OVERNIGHT.   
TRANSPORT WINDS.....NORTH 6 MPH.   
   
TUESDAY  
  
SKY/WEATHER.........SUNNY.   
CWR.................0 PERCENT.   
CHANCE OF LIGHTNING.0 PERCENT.   
MAX TEMPERATURE.....58-62.   
MIN HUMIDITY........30-34 PERCENT.   
WIND (20 FT)........   
 SLOPE/VALLEY.......LIGHT AND VARIABLE EARLY, THEN UPSLOPE/  
                    UPVALLEY 5-10 MPH.   
 RIDGETOP...........NORTHWEST 5-10 MPH.   
MIXING HEIGHT.......INCREASING TO 5500 FT AGL IN THE AFTERNOON.   
TRANSPORT WINDS.....NORTHWEST 8 MPH.   
   
TUESDAY NIGHT  
  
SKY/WEATHER.........CLEAR.   
CWR.................0 PERCENT.   
CHANCE OF LIGHTNING.0 PERCENT.   
MIN TEMPERATURE.....31-35.   
MAX HUMIDITY........72-76 PERCENT.   
WIND (20 FT)........   
 SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY 3-6 MPH.   
 RIDGETOP...........WEST 5-10 MPH.   
MIXING HEIGHT.......DECREASING TO 500 FT AGL OVERNIGHT.   
TRANSPORT WINDS.....WEST 5 MPH.   
   
WEDNESDAY  
  
SKY/WEATHER.........SUNNY.   
CWR.................0 PERCENT.   
CHANCE OF LIGHTNING.0 PERCENT.   
MAX TEMPERATURE.....64-68.   
MIN HUMIDITY........23-27 PERCENT.   
WIND (20 FT)........   
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 5-10 MPH.   
 RIDGETOP...........WEST AROUND 10 MPH.   
MIXING HEIGHT.......INCREASING TO 4500 FT AGL IN THE AFTERNOON.   
TRANSPORT WINDS.....WEST 10 MPH.   
   
FORECAST DAYS 3 THROUGH 7  
   
THURSDAY  
  
CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER 60S. SOUTHWEST   
WINDS 5 TO 15 MPH.    
FRIDAY  
  
MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S. WEST  
WINDS 10 TO 20 MPH.    
SATURDAY  
  
MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S.  
SOUTHWEST WINDS 10 TO 20 MPH.    
SUNDAY  
  
MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S.    
MONDAY  
  
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS IN THE UPPER 30S.  
HIGHS IN THE LOWER 60S.   
  
  
FORECASTER...LESTER  
REQUESTED BY...GARET DODAHL  
TYPE OF REQUEST...WILDFIRE  
.TAG 2520413.33/BYZ  
.DELDT 09/22/25  
.FORMATTERVERSION 2.0.0  
.EMAIL GARET.DODAHL@USDA.GOV  
 
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