887  
FXUS61 KPBZ 141218  
AFDPBZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PITTSBURGH PA  
718 AM EST THU DEC 14 2017  
   
SYNOPSIS
 
 
RAPIDLY MOVING LOW PRESSURE WILL CONTINUE THE SNOW OVERNIGHT.  
SNOW WILL END ACROSS MUCH OF THE REGION AROUND DAWN SAVE SOME  
LINGERING SNOW SHOWERS OVER THE RIDGES. CLOUDY AND COLD FOR THE  
REST OF THE DAY.  
 

 
   
NEAR TERM /UNTIL 6 PM THIS EVENING/
 
 
BULK OF THE SNOW HAS MOVED OFF TO THE EAST AS LOW PRESSURE MOVES  
OFFSHORE. HAVE DROPPED THE NON-RIDGE WINTER WEATHER ADVISORY ON  
TIME, BUT A PERIOD OF GENERALLY LIGHT SNOW SHOWERS WILL CONTINUE  
IN POST-FRONTAL NORTHWEST FLOW FOR A FEW HOURS. THESE SHOULD  
DIMINISH LATER THIS MORNING AS INVERSION HEIGHTS DROP AND  
MOISTURE WANES. THE RIDGE AREAS WILL CONTINUE WITH THE ADVISORY  
FOR NOW WITH THE UPSLOPE HELP, BUT EVEN HERE, ACTIVITY SHOULD  
DIMINISH BY NOON. MAIN CHANGE WAS TO UP POPS WEST OF THE RIDGES  
FOR LINGERING SNOW SHOWERS, OTHERWISE MAINLY MINOR CHANGES WERE  
MADE.  
 
PLENTY OF CLOUDS REMAIN TODAY IN THE STRONG COLD AIR ADVECTION  
AND TEMPERATURES WILL BE WELL BELOW NORMAL.  
 

 
   
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/
 
 
CLOUDS WILL LINGER OVERNIGHT.  
 
WEAK SHORTWAVE TROUGH WILL APPROACH THE AREA LATE FRIDAY,  
RETURNING THE RISK FOR SNOW SHOWERS. TEMPERATURES REMAIN WELL  
BELOW NORMAL ON FRIDAY.  
 

 
   
LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/
 
 
TROUGH WILL QUICKLY SWING THROUGH FRIDAY NIGHT AND SNOW SHOWERS  
WILL LINGER INTO SATURDAY.  
 
SLOW HEIGHT RISES ALOFT BEGIN SATURDAY AFTERNOON, BRINGING AND  
END TO THE SNOW SHOWER ACTIVITY AND ALLOWING FOR WARMER AIR TO  
OVERSPREAD THE REGION.  
 
FLOW GOES ZONAL OVER OUR AREA BY SUNDAY AS OUR TROUGH LIFTS OUT  
AND ENERGY DIGS INTO THE SOUTHWEST U.S. THIS WILL RESULT IN  
CONTINUED TEMPERATURE MODERATION TOWARDS MORE SEASONAL LEVELS.  
THE NEXT SYSTEM ARRIVES ON SUNDAY AND WILL BE MAINLY A RAIN  
PRODUCER FROM THE SOUTHERN BRANCH OF THE JET STREAM. THE PATTERN  
COULD REMAIN UNSETTLE THEREAFTER WITH WEAK WAVES IN THE WEST-  
SOUTHWEST FLOW ALOFT, WITH PERHAPS ANOTHER COOL DOWN BY THE  
MIDDLE OF NEXT WEEK.  
 

 
   
AVIATION /12Z THURSDAY THROUGH MONDAY/
 
 
WIDESPREAD IFR/MVFR SNOW WILL BE DECREASING IN COVERAGE THIS  
MORNING AS SURFACE LOW MOVES RAPIDLY TOWARD THE EAST COAST.  
CONDITIONS WILL IMPROVE THIS MORNING FROM WEST TO EAST,  
ALTHOUGH MVFR STRATOCU WILL PERSIST THROUGH THE REMAINDER OF  
THE FORECAST PERIOD, AS COLD NORTHWEST FLOW UPSLOPES OFF THE  
LAKES.  
   
OUTLOOK
 
 
NEXT CHANCE FOR RESTRICTIONS IS LATE FRIDAY INTO SATURDAY.  
 

 
   
PBZ WATCHES/WARNINGS/ADVISORIES
 
 
MD...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR  
MDZ001.  
OH...NONE.  
PA...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR  
PAZ076.  
WV...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR  
WVZ511>514.  
 

 
 

 
 
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