608  
FXUS65 KGGW 182024  
AFDGGW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GLASGOW MT  
224 PM MDT WED JUL 18 2018  
   
DISCUSSION
 
 
SURFACE TROUGH MOVING EAST THROUGH THE AREA THIS AFTERNOON WILL  
SPARK SCATTERED THUNDERSTORMS NORTH TO SOUTH THROUGH THE CENTRAL  
PORTION OF THE CWA THEN MOVE EAST THIS EVENING. STRONG  
THUNDERSTORMS CAN BE EXPECTED THROUGH ABOUT 9 PM, WHERE SMALL  
HAIL, GUSTY WINDS AND BRIEF HEAVY RAIN ARE POSSIBLE.  
 
UPPER AIR PATTERN THEN HAS A WEAK UPPER RIDGE THAT IS PARKED OVER  
THE AREA THROUGH FRIDAY. WEAK DISTURBANCES WILL BRING THE SLIGHT  
CHANCE OF THUNDERSTORMS WHILE TEMPERATURES WARM INTO SATURDAY. ON  
FRIDAY, A STRONG CLOSED UPPER LOW MOVES EAST THROUGH BRITISH  
COLUMBIA THEN INTO NORTHERN SASK SUNDAY. THE CHANCE FOR  
THUNDERSTORMS LOOK QUITE SMALL AS DRY AIR WILL LIMIT THINGS. THE  
BIGGER IMPACT MAY COME SUNDAY WITH A COLD FRONT. WINDS BEHIND THE  
FRONT WILL PROBABLY BE STRONG ENOUGH FOR CONCERNS ON FORT PECK  
LAKE LATE IN THE DAY. BELOW NORMAL TEMPERATURES CAN BE EXPECTED TO  
START NEXT WEEK. TFJ  
 

 
   
AVIATION
 
 
EXPECTED FLIGHT CATEGORY: VFR, POSSIBLY BRIEF MVFR UNDER HEAVIEST  
SHOWER/THUNDERSTORM.  
 
SYNOPSIS: A LOW PRESSURE TROUGH MOVING EAST THROUGH THE AREA WILL  
EXIT INTO WESTERN NORTH DAKOTA TONIGHT. SCATTERED SHOWERS AND  
THUNDERSTORMS WILL AFFECT MAINLY KOLF AFTERNOON THEN KSDY THIS  
EVENING.  
 
WINDS: LIGHT AND VARIABLE THROUGH TONIGHT, BUT GUSTY AND ERRATIC  
IN AND NEAR THUNDERSTORMS. TFJ  
 

 
   
FIRE WEATHER
 
 
CANCELLING RED FLAG WARNING FOR FW ZONE 134, AS SURFACE TROUGH IS  
MOVING IN SLOWER THAN EXPECTED AND HUMIDITIES REMAIN HIGH.  
SCATTERED SHOWERS WERE ALSO OBSERVED ACROSS MOST OF PHILLIPS  
COUNTY AT 200 PM. HIGHER WINDS AND LOWER HUMIDITIES WERE OBSERVED  
IN PETROLEUM AND SOUTHERN PHILLIPS COUNTIES (FW ZONES 135 AND  
136), SO WILL KEEP THE RFW GOING HERE. TFJ  
 

 
   
GLASGOW WATCHES/WARNINGS/ADVISORIES
 
 
RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR MTZ135-136.  
 

 
 

 
 
WEATHER.GOV/GLASGOW  
 
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