432  
FXUS65 KGGW 200826  
AFDGGW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GLASGOW MT  
226 AM MDT SAT JUL 20 2024  
   
DISCUSSION
 
 
KEY MESSAGES:  
 
- ISOLATED/SCATTERED THUNDERSTORMS ARE AGAIN POSSIBLE THIS  
AFTERNOON AND EARLY EVENING.  
 
- HIGHS WILL BE IN THE UPPER 80S OR THE 90S MOST OF THE TIME  
THROUGH TUESDAY. HIGHS WILL BE NEAR 100 ON WEDNESDAY AND 100+ IN  
MOST AREAS THURSDAY.  
 
- HAZE FROM CANADIAN WILDFIRES IS EXPECTED TO MOVE INTO THE AREA  
THE NEXT COUPLE DAYS.  
 
WEATHER PATTERN OVERVIEW:  
 
UPPER AIR PATTERN SHOWING A STRONG UPPER RIDGE OVER THE WESTERN  
STATES AND PROVINCES OF CANADA. A WEAK DISTURBANCE WILL BRING  
ANOTHER CHANCE OF LATE-DAY THUNDERSTORMS TODAY, WITH THE BEST  
CHANCE OVER THE EASTERN ZONES. THEN, THINGS REMAIN NEARLY  
STATIONARY INTO TUESDAY.  
 
THEN THE UPPER RIDGE INTENSIFIES OVER THE AREA BY THE MIDDLE OF  
NEXT WEEK AS AN UPPER LOW MOVES INTO BRITISH COLUMBIA. THIS WILL  
INCREASE TEMPERATURES TO NEAR 100 FOR HIGHS ON WEDNESDAY AND 100+  
IN ALMOST ALL AREAS ON THURSDAY AS A SW UPPER FLOW DEVELOPS.  
RIGHT NOW, NBM 90 PERCENTILE AND GFS ENSEMBLE MEAN HAVE HIGHS  
NEAR 110 ON THURSDAY IN SOME AREAS. EITHER A HEAT ADVISORY OR  
EXCESSIVE HEAT WARNING IS POSSIBLE WEDNESDAY AND THURSDAY IF THE  
GOING FORECAST MATERIALIZES.  
 
BEYOND THIS, THE UPPER LOW MOVES ACROSS THE CANADIAN PRAIRIES AND  
PUSHES THE VERY HOT AIR TO THE EAST.  
 
FORECAST CONFIDENCE & DEVIATIONS:  
 
HIGH CONFIDENCE OF THE RIDGE INTENSIFYING EARLY NEXT WEEK WITH  
HIGHS IN THE 90S MOST OF THE TIME THROUGH TUESDAY AND MOST AREAS  
NEAR 100 FOR HIGHS ON WEDNESDAY AND 100+ ON THURSDAY.  
 
CONFIDENCE IN THE SPECIFIC LOCATION AND TIMING OF ANY  
THUNDERSTORMS IS LOW TO MEDIUM AT THIS POINT.  
 

 
   
AVIATION
 
 
FLIGHT CONDITION: VFR, BRIEF MVFR WITH ANY HEAVY RAINSHOWERS.  
 
DISCUSSION: LOOK FOR MOSTLY CLEAR SKIES THIS MORNING WITH CUMULUS  
DEVELOPING THIS AFTERNOON. ISOLATED TO SCATTERED THUNDERSTORMS ARE  
EXPECTED THIS AFTERNOON INTO EARLY EVENING. SKIES WILL BECOME  
MOSTLY CLEAR AFTER SUNSET THIS EVENING.  
 
WIND: VARIABLE AT LESS THAN 10 KNOTS TODAY AND TONIGHT.  
 

 
   
GGW WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  

 
 

 
 
WEATHER.GOV/GLASGOW  
 
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