673  
FNUS75 KBYZ 211009  
FWSBYZ  
 
SPOT FORECAST FOR HORSETHIEF PILES...BLM  
NATIONAL WEATHER SERVICE BILLINGS MT  
309 AM MST FRI FEB 21 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 MST ON FEBRUARY 21.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
CONDITIONS WILL BE DRY WITH NEAR NORMAL TEMPERATURES IN THE MID  
30S TO LOW 40S F. MELTING SNOW MAY CAUSE PONDING OF WATER AND  
MUDDY CONDITIONS ON RURAL ROADS. RH VALUES WILL REMAIN HIGH  
THROUGHOUT THE PERIOD. WINDS WILL BE PERSISTENT OUT OF THE  
SOUTHWEST WITH GUSTS INTO THE 20S MPH.  
   
TODAY
 
 
SKY/WEATHER.........SUNNY.  
MAX TEMPERATURE.....35-39.  
MIN HUMIDITY........68-72 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......SOUTHWEST 10 TO 14 MPH GUSTING TO 25 MPH  
IN THE AFTERNOON.  
MIXING HEIGHT.......INCREASING TO 1200 FT AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....WEST 12 TO 18 MPH.  
 
TIME (MST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........13 10 5 6 22 17 15 8 25 38 30  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............14 14 19 27 31 33 34 36 37 37 34  
RH..............78 80 79 72 73 70 70 72 72 71 71  
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW  
20 FT WIND SPD..8 9 10 11 12 14 14 15 14 13 12  
20 FT WIND GUST.12 13 14 16 18 23 23 23 20 18 18  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY BECOMING MOSTLY CLOUDY.  
MIN TEMPERATURE.....23-27.  
MAX HUMIDITY........72-76 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......SOUTHWEST 10 TO 12 MPH. GUSTS UP TO 22  
MPH.  
MIXING HEIGHT.......DECREASING TO 400 FT AGL OVERNIGHT.  
TRANSPORT WINDS.....SOUTHWEST 16 TO 20 MPH.  
 
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........35 27 30 25 28 37 52 63 75 82 89 89  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............30 29 28 28 26 25 25 28 28 29 29 30  
RH..............72 72 71 71 70 72 74 72 74 72 73 71  
20 FT WIND DIR..SW W W W SW SW SW SW SW SW W W  
20 FT WIND SPD..11 10 10 10 10 10 10 11 11 11 10 10  
20 FT WIND GUST.18 17 17 17 20 20 20 20 20 22 22 22  
   
SATURDAY
 
 
SKY/WEATHER.........CLOUDY.  
MAX TEMPERATURE.....39-43.  
MIN HUMIDITY........69-73 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......WEST 11 TO 16 MPH WITH GUSTS TO AROUND 27  
MPH.  
MIXING HEIGHT.......INCREASING TO 900 FT AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....WEST 22 TO 24 MPH.  
 
TIME (MST) 6 AM 9 AM NOON 3 PM  
SKY (%).........79 69 63 53  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE  
TSTM COV........  
TEMP............29 33 40 41  
RH..............74 74 74 73  
20 FT WIND......W 11G16 W 13G18 W 14G23 W 15G27  
 

 
FORECASTER...TORGERSON/PALMQUIST  
REQUESTED BY...ROBERT GRIFFIN  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2502964.3/BYZ  
.DELDT 02/21/25  
.FORMATTERVERSION 2.0.0  
.EMAIL DDAY@BLM.GOV,RMGRIFFIN@BLM.GOV  
 
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