869  
FXUS61 KCTP 182240  
AFDCTP  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE STATE COLLEGE PA  
640 PM EDT FRI JUL 18 2025  
   
SYNOPSIS
 
 
* A COOL NIGHT FOR MID JULY IN STORE FOR PA.  
* MORE NUMEROUS SHOWERS/STORMS POSSIBLE LATE SAT THROUGH LATE  
SUNDAY AS A WARM FRONT MOVES NORTHEAST ACROSS THE REGION.  
* A COLD FRONT PUSHES SOUTHEAST ACROSS PA LATE SUN/SUN NIGHT,  
FOLLOWED BY 2-3 DAYS OF DRY WEATHER WITH COMFORTABLE, LOWER  
HUMIDITY.  
* ANOTHER HOT AND HUMID SPELL EXPECTED BY LATE NEXT WEEK.  
 

 
   
NEAR TERM /THROUGH SATURDAY/
 
 
A FEW SHOWERS OVER SOUTHERN PA EARLY THIS EVENING WILL QUICKLY  
LEAD TO CLEARING SKIES OVERNIGHT. DEWPOINTS BELOW THE 50 DEGREE  
MARK OVER NORTHERN PA NOW, SO LOOKING AT A RATHER COOL NIGHT FOR  
WHAT IS NORMALLY THE HOTTEST WEEK OF THE SUMMER.  
 
EARLIER DISCUSSION BELOW.  
 
THE FRONT LINGERS JUST SOUTH OF THE BORDER TONIGHT, BUT DRIFTS  
SLOWLY NORTHWARD LATE TONIGHT AND PUSHES THROUGH MUCH OF THE CWA  
LATER SAT AFTERNOON AND EVENING.  
 
THE MAIN CHANCE FOR HEAVIER SHOWERS AND STORMS WILL BE THE FAR  
WEST AND SOUTH ON SATURDAY, AND THE RETURN OF WARM AND HUMID  
AIR MAY HINT THAT THE SOUTHEAST PART OF THE CWA HAS SOME HEAVIER  
DOWNPOURS LATE IN THE DAY. THUS 2 AREAS TO WATCH.  
 
WARM ADVECTION ALOFT SHOULD KEEP MUCH OF THE AREA CAPPED OFF,  
PREVENTING MOST DEEP CONVECTION UNTIL LATER SAT. THE SRN TIER  
WILL HAVE THE HIGHEST POPS SAT.  
 
HIGH TEMPS SATURDAY WILL FEATURE A FAIRLY TIGHT RANGE FROM THE  
UPPER 70S TO MID 80S, BASED GREATLY ON THE AMOUNT OF CLOUD  
COVER.  
 

 
   
SHORT TERM /SATURDAY NIGHT/
 
 
NO REAL CHANGE TO THIS SECTION OF THE AFD AT THIS POINT.  
 
EARLIER DISCUSSION BELOW.  
 
SATURDAY NIGHT WILL BE WARM AND MUGGY IN THE WARM SECTOR AS THE  
WARM FRONT MOVES INTO EASTERN PA/SOUTHERN NY. PWAT VALUES WILL  
CLIMB BACK UP TO BETWEEN 1.5 AND 1.8 INCHES ACROSS THE BULK OF  
THE AREA.  
 
MIN TEMPS SATURDAY NIGHT WILL RANGE FROM THE MID TO UPPER 60S IN  
MOST PLACES TO THE LOW 70S IN THE LARGER METRO AREAS THROUGHOUT  
THE LOWER SUSQ VALLEY.  
 

 
   
LONG TERM /SUNDAY THROUGH FRIDAY/
 
 
SUNDAY WILL FEATURE MORE OF A CHANCE OF A GUSTY STORM AND OR  
A HEAVY DOWNPOUR. OUTLOOKS FOR NOW ARE MAINLY MARGINAL FOR OUR  
AREA. SEE THE HWO FOR MORE INFORMATION.  
 
AFTER THE COLD FRONT MOVES ACROSS ON SUNDAY, LOOKING AT A RATHER  
STRONG SHOT OF COOLER AIR FOR MID JULY TO WORK IN FOR MONDAY  
INTO TUESDAY. MUCH LOWER DEWPOINTS AND LOTS OF SUN, WITH A  
BREEZE.  
 
UNLIKE THE PAST FEW WEEKS, THE PATTERN NOW SUPPORTS MORE OF A  
PROGRESSIVE MOVEMENT OF WEATHER SYSTEMS.  
 
EARLIER DISCUSSION BELOW.  
 
ONCE AGAIN, NO SIGNIFICANT PATTERN CHANGES ARE ON THE HORIZON.  
WE'LL CONTINUE TO SEE AN ELONGATED SUMMERTIME UPPER RIDGE AXIS  
FROM THE SOUTHWESTERN ATLANTIC ACROSS ROUGHLY THE SOUTHERN HALF  
OF THE CONUS, WITH AN ENERGETIC NORTHERN STREAM NEAR THE  
INTERNATIONAL BORDER WITH CANADA.  
 
AS FOR THE DAILY SENSIBLE WEATHER, RECENT MEDIUM-RANGE MODEL  
GUIDANCE SUGGESTS THAT A SHORTWAVE TROUGH WITHIN THE ABOVE  
MENTIONED BELT OF WESTERLIES WILL AMPLIFY ENOUGH LATER THIS  
WEEKEND AND EARLY NEXT WEEK TO HELP DRIVE A SURFACE COOL FRONT  
DOWN INTO THE SOUTHERN MID-ATLANTIC. THIS WOULD ALLOW ANOTHER  
REFRESHING AIR MASS TO AT LEAST BRIEFLY BUILD OVER THE  
COMMONWEALTH LATER SUNDAY AND MONDAY. PRIOR TO THAT, THOUGH, THE  
PASSAGE OF THE COOL FRONT ITSELF ON SUNDAY SHOULD SPARK SOME  
SHOWERS AND THUNDERSTORMS.  
 
TOWARDS THE MIDDLE OF NEXT WEEK, LONGER RANGE GUIDANCE IS STILL  
SUGGESTIVE OF THE SOUTHERN CONUS UPPER RIDGE FLEXING ITS MUSCLE,  
WITH ACCOMPANYING HEIGHT RISES FOR PA SIGNALING A GRADUAL RETURN  
OF HEAT AND HUMIDITY, ALONG WITH INCREASED CHANCES FOR  
AFTERNOON/EVENING FOCUSED SHOWERS AND THUNDERSTORMS.  
 

 
   
AVIATION /22Z FRIDAY THROUGH WEDNESDAY/
 
 
A WAVE OF LOW PRESSURE WILL MOVE ALONG A STALLED FRONTAL  
BOUNDARY SOUTH OF THE MARYLAND BORDER THIS AFTERNOON AND EVENING  
AND WILL BRING A FEW HOUR PERIOD OF SHOWERS TO LAUREL HIGHLANDS  
AND SCENT COUNTIES OF THE STATE. JST AND AOO WILL HAVE THE BEST  
CHANCE OF SEEING RAIN WITH LESS THAN A 10 PERCENT CHANCE OF  
MEASURABLE PRECIPITATION NE OF A KBFD TO KMUI LINE.  
 
KJST WILL STRUGGLE TO HAVE ITS CLOUD BASES LIFT OUT OF THE MVFR  
RANGE TODAY. AT BEST, THEY COULD SEE STRATOCU BASES POKE UP TO  
030-035 AT TIMES AFTER THE WESTERN EDGE OF THE SHOWERS MOVES  
THROUGH AFTER 21Z. KAOO WILL BE SIMILAR TO KJST. BOTH LOCATIONS  
WILL DIP INTO AT LEAST THE IFR RANGE LATE TONIGHT (THOUGH CIGS  
AT KJST SHOULD DROP BELOW 005 FOR A 6-8 HOUR PERIOD SATURDAY  
MORNING.  
 
THE MVFR CLOUD DECK ACROSS THE SW WILL LIKELY SPREAD OVER THE  
SUSQ VALLEY THIS EVENING THROUGH THE OVERNIGHT.  
 
ELSEWHERE ACROSS CENTRAL AND NORTHERN PA (KUNV, KIPT AND KBFD),  
VFR WILL PREVAIL THROUGH MUCH OF TONIGHT, BUT SOME PATCHY  
GROUND FOG COULD REDUCE THE VSBY TO 1-2 MILES LATE TONIGHT  
(06-11Z SAT).  
 
A FEW SHOWERS WILL CONTINUE ACROSS THE SOUTHERN HALF OF  
PENNSYLVANIA TONIGHT AS THE STALLED BOUNDARY BEGINS TO LIFT  
NORTHWARD AS A WARM FRONT. MODEL RH PROFILES SUGGEST THAT LOW  
CLOUDS AND FOG WILL FORM AFTER ~03Z, WITH SITES WEST/SOUTH OF  
UNV BEING MOST LIKELY TO SEE VISIBILITY RESTRICTIONS DEVELOP.  
 
OUTLOOK...  
 
SAT...MAINLY DRY THROUGH SATURDAY MORNING, WITH INCREASING  
CHANCES FOR AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS.  
 
SUN...NUMEROUS SHOWERS AND THUNDERSTORMS ANTICIPATED.  
 
MON-TUE...DRY CONDITIONS.  
 
WED...STILL MAINLY DRY.  
 

 
   
CTP WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  
 

 
 

 
 
SYNOPSIS...LAMBERT/DANGELO/MARTIN  
NEAR TERM...LAMBERT/MARTIN  
SHORT TERM...LAMBERT/DANGELO/MARTIN  
LONG TERM...JUREWICZ/MARTIN  
AVIATION...LAMBERT/BAUCO  
 
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