082
FXUS61 KCTP 012258
AFDCTP
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
658 PM EDT SUN JUN 1 2025
SYNOPSIS
* FROST IS EXPECTED FOR THE ALLEGHENY PLATEAU TONIGHT, WITH
PATCHY FROST IN THE LAURELS AND PERHAPS CENTRAL MOUNTAINS.
* DRY CONDITIONS PREVAIL FOR THE FIRST HALF OF THE WEEK, BEFORE
A RETURN TO SHOWERS AND THUNDERSTORMS BY THURSDAY.
* A TREND TOWARDS MUCH WARMER, SUMMER-LIKE CONDITIONS IS
FORESEEN THIS WEEK.
NEAR TERM /THROUGH MONDAY/
AS WE LOSE (HEATING OF) THE SUN, WE SHOULD ALSO LOSE THE THICK
STRATOCU OVER THE CWA, LATEST IN THE NE, OF COURSE. THAT WILL
LEAVE US WITH A FAIR AND COLD NIGHT FOR EARLY JUNE. WHILE WE
LIKELY WON'T HIT ANY RECORD LOWS, IT WILL GET COLD AND WE LOSE
THE WIND, TOO. THE EXPECTED MINS IN THE M30S OVER THE NW THIRD
OF THE AREA SHOULD ALLOW AREAS OF FROST TO FORM EVEN THOUGH
THERE WILL BE AN INCREASE IN SMOKE ALOFT THRU THE NIGHT. PATCHY
FROST IS ALSO POSSIBLE IN THE COLD SINKS/VALLEYS/OPEN AREAS OF
THE NEXT TIER OR TWO OF ZONES TO THE SE OF THERE INCLUDING THE
LAURELS AND SOME OF THE RIDGE AND VALLEY REGION (JST-UNV-IPT).
WE HAVE POSTED A FROST ADVY FOR THE NW, AND STRONGLY CONSIDERED
ONE FOR THE NEXT FEW ZONES SE. HOWEVER, GUIDANCE TEMPS ARE A
LITTLE HIGHER THERE ACROSS THE BOARD, AND GIVE US LESS
CONFIDENCE IN GOING ANY COLDER.
AFTER THE FROSTY START, WE SHOULD BE GOOD TO GET INTO THE 66-73F
RANGE FOR MAXES ON MONDAY AS WE ADD ABOUT 2-3C ONTO 8H TEMPS AND
WE MIX UP TO AND PAST 8H. BY THE END OF THE DAY, THE UPPER
TROUGH AXIS SHOULD BE OFF TO OUR EAST AND THE SFC HIGH/RIDGE
AXIS OVERHEAD.
SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY NIGHT/
SURFACE HIGH PRESSURE HOLDS THROUGH FIRM THROUGHOUT THE SHORT-
TERM PERIOD BRINGING CONTINUED FAIR WEATHER MONDAY EVENING
THOUGH THURSDAY MORNING. OVERALL WARMING TREND IS PROGGED BY ALL
MODEL GUIDANCE TO CONTINUE THROUGH THE SHORT-TERM, TOO, WITH
HIGH TEMPERATURES NEAR-AVERAGE ON MONDAY TREND WELL-ABOVE
CLIMATOLOGICAL AVERAGES BY WEDNESDAY. RECENT RUNS OF THE
VERTICALLY INTEGRATED SMOKE PRODUCT FROM THE HRRR OUTLINE
INCREASING SMOKE ACROSS CENTRAL PENNSYLVANIA ON TUESDAY UNDER
NORTHWESTERLY FLOW.
LONG TERM /THURSDAY THROUGH SUNDAY/
HIGH PRESSURE BEGINS TO SHIFT FURTHER EAST THURSDAY MORNING
WITH MODEL GUIDANCE OUTLINING MODEST AGREEMENT IN A WEAK AREA OF
LOW PRESSURE WEST OF THE AREA GRADUALLY MOVING CLOSER TO
CENTRAL PENNSYLVANIA. SURGING PWATS AND LOWERING HEIGHTS AHEAD
OF THIS AREA OF LOW-PRESSURE SUPPORT PRECIPITATION MENTIONS JUST
AHEAD OF SUNRISE ON THURSDAY. AS LOW-PRESSURE APPROACHES AND
BETTER MOISTURE SPREADS INTO THE AREA THURSDAY AFTERNOON,
WIDESPREAD RAIN SHOWERS APPEAR INCREASINGLY LIKELY ON FRIDAY AS
AN ASSOCIATED COLD FRONT APPROACHES THE AREA. COLD FRONT IS
EXPECTED TO BE BEGINNING TO DECAY AT THIS JUNCTURE WITH LOWER
SHEAR VALUES AND MARGINAL CAPE. GIVEN THESE PARAMETERS, LOW
CONFIDENCE ON ANY SEVERE WEATHER CONCERNS ON THURSDAY.
CONFIDENCE IN THE FORECAST BECOMES LOWER AFTER FRIDAY; HOWEVER,
WITH ECMWF DETERMINISTIC GUIDANCE INDICATING DRIER CONDITIONS
EARLY SATURDAY THROUGH THE END OF THE LONG-TERM FORECAST PERIOD.
RECENT GFS DETERMINISTIC GUIDANCE DOES HOLD MOISTURE FURTHER
INTO CENTRAL PENNSYLVANIA FOR THE FIRST HALF OF SATURDAY BEFORE
TRENDING DRIER THROUGH THE END OF PERIOD. GIVEN THIS GUIDANCE,
HAVE OPTED TO STICK CLOSE TO NBM GUIDANCE SATURDAY AND SUNDAY;
HOWEVER, IN FUTURE CYCLES COULD REALISTICALLY SEE SUNDAY
TRENDING DRIER OVERALL.
AVIATION /00Z MONDAY THROUGH FRIDAY/
HIGH PRESSURE WILL PROVIDE THE REGION WITH MAINLY CLEAR SKIES
AND VFR CONDITIONS INTO TUESDAY.
LOCATIONS LIKE CORNING, NY, IPT, AND BFD WILL HAVE SOME CHANCE
FOR A VERY BRIEF PERIOD OF FOG TONIGHT, BUT DEWPOINTS ARE QUITE
LOW AND A SLIGHT BREEZE MAY PREVAIL. MAIN THING GOING FOR ANY
FOG IS THE RECENT WET WEATHER. THUS THINK CHC OF FOG ON THE LOW
SIDE TONIGHT.
SOME SMOKE AT TIMES, BUT MAINLY ACROSS THE WEST AND SOUTH EARLY
ON TONIGHT. COULD BE SOME NORTHERN LIGHTS LATER.
OUTLOOK...
TUE-WED...VFR EXPECTED.
THU...POTENTIAL BRIEF RESTRICTIONS IN SHRA/TSRA NW.
FRI...NUMEROUS SHRA/TSRA, ESP NW. BRIEF REDUCTIONS TO MVFR AND
IFR IN THE TSRA.
CLIMATE
MAY 2025 PRECIPITATION RANKINGS
SITE 2025 | WETTEST MAY ON RECORD
-----------------------------------------------------------
HARRISBURG* 10.02" WETTEST | 9.71" IN 1989 (PREVIOUS)
WILLIAMSPORT 7.18" 7TH WETTEST | 9.91" IN 1919
ALTOONA* 7.34" WETTEST | 7.31" IN 1960 (PREVIOUS)
STATE COLLEGE 7.56" T-7TH WETTEST | 9.45" IN 1894
(* DENOTES THAT MAY 2025 SET A NEW RECORD IN PRECIPITATION IN
THEIR RESPECTIVE LOCATIONS. THE PREVIOUS RECORD REMAINS LISTED
UNDER THE "WETTEST MAY ON RECORD" COLUMN.)
CTP WATCHES/WARNINGS/ADVISORIES
FROST ADVISORY FROM 1 AM TO 7 AM EDT MONDAY FOR PAZ004>006-010-
011-017-037.
SYNOPSIS...DANGELO
NEAR TERM...DANGELO
SHORT TERM...NPB
LONG TERM...NPB
AVIATION...MARTIN
CLIMATE...NPB
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