579  
FXUS65 KGGW 221604  
AFDGGW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GLASGOW MT  
904 AM MST TUE JAN 22 2019  
   
DISCUSSION
 
 
MORNING UPDATE...  
PRIMARY UPDATE THIS MORNING WAS TO THE HOURLY TEMPERATURES AS  
AREAS THAT CLEARED OUT EARLIER THIS MORNING SAW TEMPERATURES  
PLUMMET DOWN TO AROUND ZERO DEGREES, INCLUDING MALTA. THESE  
TEMPERATURES WILL GRADUALLY RECOVER THROUGHOUT THE DAY WITH HIGHS  
EXPECTED TO BE IN THE MIDDLE 20S TO LOWER 30S.  
 
-MOTTICE  
 
ORIGINAL DISCUSSION...  
LOW CLOUDS OVER MUCH OF EASTERN MONTANA THIS MORNING EXPECTED TO  
MOVE OUT OF THE REGION WITH THE HIGH PRESSURE SLIDING SOUTH.  
SHORTWAVE PUSHING THROUGH THE TOP OF THE PACIFIC RIDGE IS EXPECTED  
TO DEVELOP A BRIEF CHINOOK ALONG THE FRONT RANGE TODAY, BEFORE  
BRINGING A COLD FRONT OUT OF CANADA ON WEDNESDAY. THIS WILL MEAN  
WARMER DOWNSLOPE WINDS TODAY, FOLLOWED BY COLDER NORTH WINDS ON  
WEDNESDAY WITH UPSLOPE FLOW PRODUCING SNOW MAINLY OVER THE  
SOUTHWEST ZONES.  
 
COLD HIGH PRESSURE PUSHES INTO THE NORTHERN PLAINS WEDNESDAY  
NIGHT, AND WITH TEMPERATURES DROPPING TO NEAR OR BELOW ZERO, ALONG  
WITH ENOUGH WIND DUE TO COLD AIR ADVECTION, WIND CHILLS MAY REACH  
CRITICAL LEVELS BY THURSDAY MORNING.  
 
UPPER RIDGE REBOUNDS QUICKLY OVER THE WEST, AND WITH SEVERAL  
SHORTWAVES SLIDING THROUGH THE FLOW, SHOULD SEE ARCTIC BOUNDARY  
RETREAT EASTWARD AND WARMING TEMPERATURES FOR THE END OF THE WEEK.  
 
A STRONGER ARCTIC TROF IS EXPECTED TO DROP ACROSS WESTERN CANADA  
EARLY NEXT WEEK. THIS WILL PUSH COLDER AIR AND POSSIBLY SOME  
ACCUMULATING SNOW INTO NORTHERN MONTANA. EBERT  
 

 
   
AVIATION
 
 
MVFR WITH LOW CLOUDS THROUGH THE MORNING. THESE CLOUDS WILL  
GRADUALLY CLEAR DURING THE DAY WITH VFR CONDITIONS RETURNING.  
 

 
   
GLASGOW WATCHES/WARNINGS/ADVISORIES
 
NONE.  
 

 
 

 
 
WEATHER.GOV/GLASGOW  
 
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