654  
FNUS75 KGGW 210032  
FWSGGW  
 
SPOT FORECAST FOR SQUARE BUTTE...BLM  
NATIONAL WEATHER SERVICE GLASGOW MT  
632 PM MDT THU JUL 20 2017  
 
FORECAST IS BASED ON REQUEST TIME OF 2000 MDT ON JULY 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE AT (406) 228-4042.  
 
...UPDATED TO INCLUDE CRITICAL FIRE WEATHER CONDITIONS STARTING  
THIS EVENING...  
 
...STRONG THUNDERSTORM GUST FRONT WINDS FROM THE NE APPROACHING  
THE FIRE TO ARRIVE BETWEEN 730 PM MDT TO 800 PM MDT...  
 
...RED FLAG WARNING IN EFFECT UNTIL 9 PM MDT FRIDAY FOR LOW  
RELATIVE HUMIDITY AND GUSTY WINDS...  
   
DISCUSSION
 
A LINE OF THUNDERSTORMS WELL TO THE NORTH OF THE  
AREA WILL PRODUCING A WIND SHIFT AT THE FIRE FROM NNW TO NE AT  
SPEEDS OF 20 TO 30 MPH WITH GUSTS IN THE 30S.  
 
A LOW PRESSURE DISTURBANCE IN CANADA FRIDAY WILL GENERATE STRONG  
NORTHWEST WINDS AGAIN AND IN COMBINATION WITH LOW RELATIVE  
HUMIDITY LATE FRIDAY MORNING THROUGH FRIDAY EVENING TO CREATE  
CRITICAL FIRE CONDITIONS. STRONG WIND ON SATURDAY COULD AGAIN  
PRODUCE CRITICAL FIRE WX CONDITIONS.  
   
REST OF TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). ISOLATED  
THUNDERSTORMS.  
CWR.................0 PERCENT.  
LAL.................2.  
MIN TEMPERATURE.....64-69.  
MAX HUMIDITY........43-48 PERCENT.  
WIND (20 FT)........WNW WINDS 5 TO 9 MPH SHIFTING TO THE NE 20 TO  
30 MPH WITH GUSTS TO 35 TO 40 MPH WITH THE GUST  
FRONT...ARRIVAL 730 PM TO 800 PM MDT. BECOMING  
NORTH 5 TO 8 MPH LATE EVENING BECOMING NORTHWEST  
6 TO 11 MPH AFTER MIDNIGHT.  
   
FRIDAY
 
 
SKY/WEATHER.........SUNNY (0-10 PERCENT).  
CWR.................0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....87-92.  
MIN HUMIDITY........7-12 PERCENT.  
WIND (20 FT)........WEST WINDS 8 TO 16 MPH WITH GUSTS TO AROUND 30  
MPH.  
 

 
FORECASTER...CLEMMONS  
REQUESTED BY...BRADLEY WELLER  
TYPE OF REQUEST...WILDFIRE  
.TAG 1713022.1/GGW  
.EMAIL MILESCITYDISPATCH@GMAIL.COM  
 
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