936  
FXUS65 KGGW 172039  
AFDGGW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GLASGOW MT  
139 PM MST MON FEB 17 2020  
   
DISCUSSION
 
 
AN ARCTIC AIRMASS WILL ARRIVE THIS EVENING AS A COLD FRONT DIVES  
SOUTH THROUGH THE AREA. WINDS WILL FLIP AROUND TO THE NORTH BEHIND  
THE FRONT AT 10 TO 20 MPH, BUT THE STRONGER WINDS WILL DIE DOWN BY  
LATE TONIGHT. AN AREA OF SNOW SHOWERS WILL ALSO ACCOMPANY THE  
FRONT WITH UP TO A QUICK INCH OR SO OF SNOW POSSIBLE THIS EVENING  
INTO TONIGHT.  
 
TEMPERATURES WILL BE AROUND 10 BELOW BY MORNING FOR NORTHERN  
LOCATIONS WITH SINGLE DIGITS ABOVE ZERO EXPECTED SOUTH. A WIND  
CHILL ADVISORY IS IN EFFECT FOR NORTHERN VALLEY, DANIELS, AND  
SHERIDAN COUNTIES TONIGHT INTO TUESDAY MORNING FOR WIND CHILLS AS  
COLD AS 30 BELOW ZERO.  
 
AS THE ARCTIC HIGH FOLLOWS THE COLD FRONT, CHANCES OF SNOW SHIFT  
TO THE UPSLOPE AREAS OF THE SOUTHWEST ZONES FOR TUESDAY MORNING.  
COLD AIR LINGERS OVER EASTERN MONTANA AS THE HIGH MOVES THROUGH  
THE NORTHERN PLAINS EARLY THIS WEEK. THIS ARCTIC AIR WILL BEGIN  
TO DISSIPATE BY WEDNESDAY WITH THE SURFACE HIGH MOVING INTO THE  
UPPER MIDWEST. AN UPPER RIDGE ALSO BEGINS TO BUILD INTO THE  
PACIFIC NORTHWEST DURING THIS TIME.  
 
WARM AIR WILL THEN CONTINUE TO SPREAD EAST WITH THE UPPER RIDGE  
THROUGH NEXT WEEKEND.  
 
-MOTTICE  
 

 
   
AVIATION
 
 
FLIGHT CAT: GENERALLY VFR, BUT MVFR AND IFR CONDITIONS ARE  
EXPECTED THIS EVENING INTO EARLY TONIGHT AS A BAND OF SNOW MOVES  
ACROSS ALL TAF SITES.  
 
WIND: WINDS BECOME NORTH AT 10 TO 15 KNOTS BEHIND A COLD FRONT  
THIS EVENING. WINDS DIE DOWN TO LESS THAN 10 KNOTS BY TUESDAY  
MORNING.  
 
DISCUSSION: A COLD FRONT WILL USHER IN MUCH COLDER AIR AND SNOW  
SHOWERS THIS EVENING INTO TONIGHT. UP TO A QUICK INCH OF SNOW IS  
POSSIBLE. TEMPERATURES WILL DROP NEAR OR BELOW ZERO AT ALL TAF  
LOCATIONS TUESDAY MORNING.  
 
-MOTTICE  
 

 
   
GLASGOW WATCHES/WARNINGS/ADVISORIES
 
 
WIND CHILL ADVISORY FROM 2 AM TO 11 AM MST TUESDAY FOR DANIELS...  
NORTHERN VALLEY...SHERIDAN.  
 

 
 

 
 
WEATHER.GOV/GLASGOW  
 
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