823  
FNUS75 KBYZ 221934  
FWSBYZ  
 
SPOT FORECAST FOR FIRST CREEK...BLM  
NATIONAL WEATHER SERVICE BILLINGS MT  
134 PM MDT TUE JUL 22 2025  
 
FORECAST IS BASED ON FORECAST START TIME OF 1300 MDT ON JULY 22.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
LOW CLOUDS WILL GRADUALLY DIMINISH THIS AFTERNOON WITH CHANCES  
FOR THUNDERSTORMS INCREASING AFTER 1600 MDT. BEST CHANCE FOR  
THUNDERSTORMS IS BETWEEN 1600 THROUGH 2200 MDT, THOUGH CANNOT  
RULE OUT AN ISOLATED SHOWER OR THUNDERSTORM AFTER 2200 MDT. STRONG TO  
SEVERE THUNDERSTORMS ARE POSSIBLE THIS EVENING, WITH GUSTY AND ERRATIC WINDS  
TO 65 MPH, LARGE HAIL AND HEAVY RAINFALL POSSIBLE. ISOLATED TO SCATTERED  
SHOWERS AND THUNDERSTORMS ARE POSSIBLE ONCE AGAIN ON WEDNESDAY. OUTSIDE OF  
THUNDERSTORMS, GENERALLY LIGHT NORTH TO NORTHEAST WINDS WILL PREVAIL WITH  
RH REMAINING HIGH THROUGH WEDNESDAY.  
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY. CHANCE OF SHOWERS AND  
THUNDERSTORMS AFTER 1600 MDT.  
CWR.................20 PERCENT.  
CHANCE OF LIGHTNING.30 PERCENT.  
MAX TEMPERATURE.....76-81.  
MIN HUMIDITY........45-50 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHEAST WINDS 6 TO 12 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
RIDGETOP...........NORTHEAST 7 TO 14 MPH.  
MIXING HEIGHT.......INCREASING TO 4400 FT AGL.  
TRANSPORT WINDS.....NORTH AROUND 10 MPH.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS  
BEFORE 2200 MDT. SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS OVERNIGHT. SOME THUNDERSTORMS MAY BE  
SEVERE IN THE EVENING.  
CWR.................35 PERCENT.  
CHANCE OF LIGHTNING.30 PERCENT.  
MIN TEMPERATURE.....60-64.  
MAX HUMIDITY........95-100 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTH TO NORTHEAST WINDS 5 TO 10 MPH. GUSTY AND  
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.  
RIDGETOP...........NORTHEAST 7 TO 14 MPH.  
MIXING HEIGHT.......DECREASING TO 500 FT AGL OVERNIGHT.  
TRANSPORT WINDS.....NORTH AROUND 12 MPH.  
   
WEDNESDAY
 
 
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS IN THE MORNING, THEN CHANCE OF  
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.  
CWR.................25 PERCENT.  
CHANCE OF LIGHTNING.40 PERCENT.  
MAX TEMPERATURE.....74-78.  
MIN HUMIDITY........48-56 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTH TO NORTHEAST WINDS 5 TO 10 MPH. GUSTY  
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.  
RIDGETOP...........NORTH TO NORTHEAST 6 TO 12 MPH.  
MIXING HEIGHT.......INCREASING TO 5300 FT AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....NORTH AROUND 12 MPH.  
 

 
FORECASTER...PALMQUIST  
REQUESTED BY...KELSEY  
TYPE OF REQUEST...WILDFIRE  
.TAG 2518423.0/BYZ  
.DELDT 07/22/25  
.FORMATTERVERSION 2.0.0  
.EMAIL MTMCC@FIRENET.GOV  
 
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