156  
FXUS65 KGGW 150239  
AFDGGW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GLASGOW MT  
739 PM MST THU DEC 14 2017  
 
   
EVENING UPDATE
 
 
MADE NO MAJOR UPDATES TO THE INHERITED FORECAST. TEMPERATURES  
FRIDAY LOOK TO BE WARM ENOUGH FOR PRECIPITATION TO START AS RAIN,  
TRANSITIONING TO SNOW FRIDAY EVENING. THIS STILL LOOKS TO BE A  
QUICK MOVING SYSTEM, MOVING INTO THE AREA FRIDAY NIGHT AND  
DEPARTING SATURDAY MORNING. UP TO APPROXIMATELY HALF AN INCH OF  
SNOW IS POSSIBLE SOUTH OF THE MISSOURI RIVER, WITH LITTLE TO NO  
ACCUMULATIONS NORTH OF THE MISSOURI. HICKFORD  
   
PREVIOUS DISCUSSION
 
 
SHORT WAVE WHICH BROUGHT SOME LIGHT SNOW AND LOW CLOUDS TO THE  
CWA THIS MORNING HAS EXITED TO THE SOUTHEAST WITH IMPROVING  
CONDITIONS IN ITS WAKE THIS AFTERNOON. LIGHTER WINDS AND MOSTLY  
CLEAR SKIES ARE EXPECTED TONIGHT.  
 
FOR FRIDAY, RIDGING ALOFT WILL DOMINATE WITH DRY CONDITIONS AND  
WARMER TEMPS. HOWEVER, ANOTHER TROUGH DEVELOPING IN THE PACIFIC  
NORTHWEST WILL BEGIN TO BREAK DOWN THE RIDGE AS IT MOVES INTO THE  
NORTHERN ROCKIES. MODELS ARE IN GOOD AGREEMENT WITH PROGGED QPF  
FIELDS PUSHING A MODEST AREA/BAND OF PRECIPITATION THROUGH THE CWA  
FRIDAY NIGHT. IT APPEARS THE BULK OF THIS WILL OCCUR AFTER SUNSET,  
AND COMBINED WITH SOME COLD AIR ADVECTION SHOULD PRIMARILY BE  
SNOW. DUE TO THE FAST MOVING NATURE OF THIS SYSTEM, AND BULK OF  
FORCING TRACKING SOUTHEAST, ACCUMULATIONS SHOULD BE AROUND AN INCH  
OR LESS. BY SATURDAY MORNING, THE PRECIPITATION WILL BE SOUTH OF  
THE AREA, BUT LOOK FOR LINGERING CLOUDS AND A CHILLY NORTHERLY  
WIND THROUGH THE DAY. HIGHS ON SATURDAY WILL LIKELY BE ON THE  
ORDER OF AROUND 10-15 DEGREES COOLER THAN FRIDAY. THE UPPER TROUGH  
AXIS SLIDES THROUGH US SATURDAY NIGHT LEADING TO CLEARING SKIES  
AND DECREASING WIND. OVERNIGHT LOWS WILL BE IN THE UPPER TEENS TO  
LOWER 20S FOR MOST LOCATIONS.  
 
LOOKING AHEAD TO NEXT WEEK, THE UPPER FLOW PATTERN INTENSIFIES AS  
MOVES ACROSS CANADA AND TRACKS INTO THE NORTHERN HIGH PLAINS.  
THIS WILL OPEN THE DOOR FOR ANOTHER BACK-DOORISH COLD FRONT BY  
MONDAY. THIS MAY RESULT IN A BAROCLINIC BAND OF SNOWFALL DROPPING  
SOUTH ACROSS THE CWA, BUT MODELS ARE NOT IN GOOD AGREEMENT AS TO  
THE TIMING NOR STRENGTH. SO HAVE GENERALLY KEPT POP'S ON THE LOW  
SIDE MONDAY AND MONDAY NIGHT. ANOTHER STRONG TROUGH WORKS INTO THE  
PACIFIC NORTHWEST TUESDAY. THIS RESULTS IN SOME STRONG RIDGING  
OVER THE ROCKIES AND HIGH PLAINS AT MIDWEEK BEFORE THE UPPER  
TROUGH WORKS INLAND AROUND THURSDAY AND PULLS DOWN SOME OF THE  
COLDEST AIR OF THE SEASON INTO EASTERN MONTANA. MODELS AGREE THERE  
WILL BE A GOOD CHANCE OF SNOWFALL ACROSS THE REGION WITH THIS  
SYSTEM. THEREFORE, HAVE RAISED POP'S AND LOWERED TEMPS FOR THE  
LATTER PART OF NEXT WEEK. BT  
 

 
   
AVIATION
 
 
VFR CIGS WILL PREVAIL ACROSS THE AREA TONIGHT THROUGH FRIDAY.  
EXPECT WEST WINDS FROM 5 TO 10 KTS OVERNIGHT, INCREASING TO 10 TO  
15 KTS FRIDAY. BT/AEH  
 

 
   
GLASGOW WATCHES/WARNINGS/ADVISORIES
 
NONE.  
 

 
 

 
 
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