622  
FXUS61 KPBZ 122354  
AFDPBZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PITTSBURGH PA  
754 PM EDT FRI SEP 12 2025  
   
SYNOPSIS  
 
UNSEASONABLY WARM AND DRY CONDITIONS TO CONTINUE THIS WEEKEND  
AND INTO EARLY NEXT WEEK.  
 
 
   
NEAR TERM /THROUGH SATURDAY/  
 
KEY MESSAGES:  
 
- WARM AND DRY CONDITIONS  
- RIVER VALLEY FOG POSSIBLE LATE FRIDAY NIGHT  
---------------------------------------------------------------  
 
HIGH PRESSURE REMAINS IN PLACE OVER THE REGION CONTINUING CALM,  
QUIET AND DRY CONDITIONS. LATEST SATELLITE SHOWS PATCHY CU  
NEAR/NORTH OF I-80 BUT A VERY DRY COLUMN FURTHER SOUTH LIKELY  
HURTS CLOUD DEVELOPMENT CHANCES.  
 
THE BEGINNING OF A SMALL LATE SUMMER SURGE IN TEMPERATURES IS  
EXPECTED ACROSS THE REGION TODAY WITH HIGH TEMPERATURES LOFTING  
TO AROUND 5 DEGREES ABOVE AVERAGE FOR THIS TIME OF YEAR.  
 
CALM WINDS AND CLEAR SKIES AGAIN POINT TOWARDS THE LIKELY  
DEVELOPMENT OF RIVER VALLEY FOG ACROSS THE REGION LATE FRIDAY  
NIGHT.  
 
 
   
SHORT TERM /SATURDAY NIGHT/  
 
KEY MESSAGES:  
 
- QUIET, DRY AND WARM WEATHER  
--------------------------------------------------------------  
 
SATURDAY LIKELY BEGINS CLEAR FOR MUCH OF THE AREA WITH FOG SET  
IN THE RIVER VALLEYS. FOG IS EXPECTED TO LIFT EARLY IN THE  
MORNING WITH THE ONSET OF HEATING.  
 
WARM AND DRY CONDITIONS CONTINUE ON SATURDAY WITH HIGH  
TEMPERATURES NEAR 5 DEGREES ABOVE AVERAGE. CLOUDS BEGIN TO  
INCREASE SATURDAY AFTERNOON AS A WEAK SHORT WAVE TROUGH DIVES  
THROUGH THE GREAT LAKES.  
 
 
   
LONG TERM /SUNDAY THROUGH FRIDAY/  
 
KEY MESSAGES:  
 
- RAIN CHANCES REMAIN LOW  
- MODERATE HEAT RISK IN EASTERN OHIO ON MONDAY  
------------------------------------------------------------------  
 
THE WEAKENING SHORTWAVE CROSSES THE GREAT LAKES OVERNIGHT  
SATURDAY AND EARLY MORNING SUNDAY BEFORE DEPARTING NORTHEASTWARD  
TOWARDS NEW ENGLAND DURING THE DAY SUNDAY.  
 
THE ODDS OF SQUEEZING RAIN OUT OF THIS TROUGH HAVE DIMINISHED  
FURTHER AND NOW EVEN MEASURABLE PRECIPITATION SEEMS A LONG SHOT.  
WITH DRY CONDITIONS PRECEDING AND DESCENDING DRY AIR CHASING  
THE TROUGH IT SEEMS LIKELY THAT PRECIPITATION CHANCES FIZZLE AS  
THE WAVE CROSSES THE EASTERN GREAT LAKES. PROBABILITY OF  
MEASURABLE PRECIPITATION HAS DIPPED BELOW 10%.  
 
CLOUDS ARE EXPECTED TO CLEAR QUICKLY AGAIN SUNDAY MORNING. THEN  
AFTER LITTLE MORE THAN A CLOUDY SPEED BUMP THE REGION RETURNS  
TO LARGELY SUNNY SKIES WITH DRY, QUIET AND WARM CONDITIONS SET  
TO CONTINUE INTO NEXT WEEK AS THE RIDGE AXIS SHIFTS EAST AND  
SETTLES ACROSS THE OHIO VALLEY. WITH PRECIPITATION CHANCES  
SEEMING A DISTANT HOPE, HEAT WILL BE THE MAIN HAZARD EARLY NEXT  
WEEK, ESPECIALLY WEST OF PITTSBURGH CLOSER TO THE RIDGE AXIS.  
MODERATE HEAT RISK NOSES ITS WAY EASTWARD THROUGH OHIO, TOWARDS  
THE TRI-STATE AREA MONDAY- WEDNESDAY AS HIGH TEMPERATURES REST  
IN THE MID 80S, 5-10 DEGREES ABOVE AVERAGE FOR THIS TIME OF  
YEAR.  
 
LATER NEXT WEEK THE PATTERN BECOMES MORE CONVOLUTED AS  
ENSEMBLES STRUGGLE TO AGREE ON JUST HOW MUCH IMPACT THE NEXT  
TROUGH SWINGING THROUGH CENTRAL CANADA HAS ON THE OHIO VALLEY  
RIDGE. AT THIS TIME HOWEVER, IT SEEMS LIKELY THAT DRY, QUIET AND  
WARM CONDITIONS LAST THROUGH THE END OF THE CURRENT FORECAST  
PERIOD WITH LOW PROBABILITIES FOR DISRUPTION OF THIS PATTERN BY  
NEXT WEEKEND.  
 
 
   
AVIATION /00Z SATURDAY THROUGH WEDNESDAY/  
 
HIGH PRESSURE WILL REMAIN IN CONTROL WITH VFR CONDITIONS  
EXPECTED THROUGH THE TAF PERIOD. WINDS ARE EXPECTED TO BE LIGHT  
AND VARIABLE THROUGH TONIGHT. UPPER LEVEL CLOUD COVER AND  
POTENTIAL SOME CUMULUS WILL DEVELOP TOMORROW AFTERNOON ALONG  
WITH SOME INCREASED WINDS AHEAD OF THE NEXT TROUGH APPROACHING  
THE AREA.  
   
OUTLOOK.  
 
WEAK SHORTWAVE PASSAGE LATE SATURDAY INTO SUNDAY WILL INCREASE  
MID AND UPPER LEVEL CLOUDS BUT LITTLE IN THE WAY OF RAIN SAVE  
FOR AN OCCASIONAL SPRINKLE.  
 
OUTSIDE OF LOCALIZED EARLY MORNING RIVER VALLEY FOG, VFR THUS IS  
EXPECTED THROUGH AT LEAST LATE NEXT WEEK UNDER THE INFLUENCE OF  
HIGH PRESSURE.  
 
 
   
PBZ WATCHES/WARNINGS/ADVISORIES  
 
PA...NONE.  
OH...NONE.  
WV...NONE.  
 
 
 
 
 
SYNOPSIS...AK  
NEAR TERM...AK  
SHORT TERM...AK  
LONG TERM...AK  
AVIATION...SHALLENBERGER  
CLICK HERE TO GO TO PREVIOUS BULLETINS.
The Nexlab OH Page
The Nexlab PA Page
The Nexlab WV Page
The Nexlab MD Page
Main Text Page