420  
FXUS61 KPBZ 250730  
AFDPBZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PITTSBURGH PA  
330 AM EDT SUN JUN 25 2017  
   
SYNOPSIS
 
 
UPPER LOW PRESSURE WILL MAINTAIN COOLER TEMPERATURE AND A PERIODIC  
SHOWER CHANCE FOR THE FIRST HALF OF THE WEEK.  
 

 
   
NEAR TERM /THROUGH TODAY/
 
 
ANOTHER, ALBEIT DEEPER SHORTWAVE IS PROJECTED ACROSS THE GREAT  
LAKES THIS AFTERNOON. IMPROVED LAPSE RATES AND FALLING CONVECTIVE  
THRESHOLDS UNDER COOLING MID LEVELS MAY BE SUFFICIENT TO  
SUPPORT SOME ISOLATED SHOWERS, BUT THE PROBABILITY WILL BE  
INHIBITED BY LIMITED MOISTURE. A PRECIP MENTION WAS THUS  
CONFINED TO THE I 80 CORRIDOR WHERE PROXIMITY TO THE MID LEVEL  
DISTURBANCE/COLD POOL WILL HAVE GREATER AFFECT.  
 
COLD ADVECTION SHOULD KEEP HIGHS 5 TO 10 DEGREES UNDER THE  
AVERAGES.  
 

 
   
SHORT TERM /TONIGHT THROUGH TUESDAY/
 
 
A SERIES OF SHORTWAVES ARE PROJECTED TO CROSS THE REGION DURING  
THE SHORT TERM PERIOD. IMPROVED DYNAMICS AND AN IMPROVED, BUT  
STILL LIMITED MOISTURE TAP SUPPORT BETTER PRECIP PROBABILITY FOR  
THE PERIOD. TEMPERATURES UNDER THE PERSISTENT TROUGHING REMAIN  
PROGGED ABOUT 10 DEGREES UNDER THE AVERAGES.  
 

 
   
LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/
 
 
THE LONG TERM PERIOD WILL FEATURE MODERATING TEMPERATURE AS FLOW  
ALOFT FLATTENS/RIDGES IN RESPONSE TO A TROUGH DIGGING OUT OF  
WESTERN CANADA. HUMIDITY AND WARMTH WILL ENHANCE WITH THE PROGRESS  
OF THAT TROUGH OVER THE PLAINS/MIDWEST, AND PRECIP CHANCES  
ESCALATE AS THE SYSTEM ERODES THE EASTERN RIDGE BY THE WEEKEND.  
 

 
   
AVIATION /06Z SUNDAY THROUGH THURSDAY/
 
 
VFR CONDITIONS WILL CONTINUE THROUGH THE PERIOD DESPITE A BROAD  
UPPER-LEVEL TROUGH. DIURNAL CUMULUS WILL RETURN AGAIN TODAY,  
ALONG WITH SCATTERED SHOWERS, PRIMARILY NORTH OF PITTSBURGH.  
WINDS WILL GENERALLY REMAIN WESTERLY INCREASING TO NEAR 10KTS  
DURING THE DAY, WITH GUSTS 15-20KTS.  
   
OUTLOOK
 
 
CHANCE FOR RESTRICTIONS WILL COME WITH AFTERNOON CONVECTION ON  
MONDAY AS AN UPPER TROUGH AXIS MOVES THROUGH THE REGION.  
 

 
   
PBZ WATCHES/WARNINGS/ADVISORIES
 
 
MD...NONE.  
OH...NONE.  
PA...NONE.  
WV...NONE.  
 

 
 

 
 
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