991  
FXUS61 KPBZ 242359  
AFDPBZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PITTSBURGH PA  
759 PM EDT SUN MAY 24 2020  
   
SYNOPSIS
 
 
HIGH PRESSURE WILL MAINTAIN GENERALLY DRY AND WARM WEATHER THROUGH  
MIDWEEK, WITH THE EXCEPTION BEING A VERY LOW CHANCE FOR AFTERNOON OR  
EVENING STORMS.  
 

 
   
NEAR TERM /UNTIL 6 AM MONDAY MORNING/
 
 
NO FURTHER CHANGES WERE NEEDED FOR THE EVE UPDATE.  
 
PREVIOUS...  
BUILDING HIGH PRESSURE WILL MAINTAIN DRY, WARM, AND MORE HUMID  
WEATHER TONIGHT. EXPECT LOWS 10 TO 15 DEGREEES ABOVE THE LOW 50S  
AVERAGES.  
 

 
   
SHORT TERM /6 AM MONDAY MORNING THROUGH WEDNESDAY NIGHT/
 
 
FLOW ACROSS THE CONUS GENERALLY WILL REMAIN WEAK THROUGH MID-WEEK AS  
THE PRIMARY BELT OF WESTERLIES REMAINS IN CANADA. A SLOW-MOVING  
TROUGH IN THE SRN PLAINS WILL ENABLE AN ERN-CONUS RIDGE TO AMPLIFY  
EARLY THIS WEEK, WITH THE RIDGE AXIS BUILDING INTO THE OH VALLEY.  
 
DESPITE INCREASING MOISTURE AND INSTABILITY, LACK OF LOW-LEVEL  
CONVERGENCE AND BROAD SUBSIDENCE AMID THE UPPER-LEVEL RIDGE AXIS  
WILL SUPPRESS A WIDESPREAD THREAT OF CONVECTION DURING THE EARLY HALF  
OF THE WEEK, WITH THE BEST POTENTIAL BEING ON THE PERIPHERY OF THE  
RIDGE IN AN AREA WEST OF A LINE FROM ZZV TO FKL AS STORMS FORM IN  
CENTRAL OH AND NEAR LAKE ERIE.  
 
TEMPERATURE DURING THE EARLY WEEK WILL BE UNSEASONABLY WARM, WITH  
SOME SITES APPROACHING 90F ON TUE BEFORE A SLOW TREND INTO THE MID-  
UPPER 80S LATER IN THE WEEK.  
 

 
   
LONG TERM /THURSDAY THROUGH SUNDAY/
 
 
A PROMINENT TROUGH WILL SET UP IN THE UPPER GREAT LAKES REGION LATE  
IN THE WEEK, WHICH WILL SUPPLY A COLD FRONT'S ATTENDANT FOCUS FOR  
CONVECTIVE DEVELOPMENT IN AN UNSTABLE AND MODESTLY SHEARED AIRMASS.  
 
DRIER AND SEASONABLY COOL WEATHER ARE EXPECTED IN THE POST-FRONTAL  
AIRMASS WITH A PERSISTENT ERN CONUS TROUGH.  
 

 
   
AVIATION /00Z MONDAY THROUGH FRIDAY/
 
 
VFR UNDER BUILDING HIGH PRES IS EXPECTED TO BE MARRED ONLY BY LOCALIZED  
PERI-DAWN FOG. SCATTERED AFTN CUMULUS MONDAY WILL FADE AS TEMPERATURE  
FALLS BLO CONVECTIVE THRESHOLDS DURING THE EVENING.  
   
OUTLOOK
 
 
LOCAL RESTRICTIONS ARE POSSIBLE IN PERI-DAWN FOG. RESTRICTIONS ARE  
LIKELY WITH A THU COLD FRONT.  
 

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

 
 

 
 
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