271
FXUS61 KPBZ 211713
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
1213 PM EST SUN DEC 21 2025
SYNOPSIS
DRY, QUIET, AND BREEZY CONDITIONS TODAY. RAIN CHANCES, MIXED
WITH A WINTRY MIX, ARE EXPECTED LATE MONDAY INTO EARLY TUESDAY.
WARM PATTERN EXPECTED LATE THIS WEEK.
NEAR TERM /THROUGH TONIGHT/
KEY MESSAGES:
- DRY AND QUIET WEATHER TODAY AND TONIGHT
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POST-FRONTAL CONDITIONS WILL REMAIN BREEZY THROUGH SUNSET, WITH
GUSTS PEAKING AT 25MPH. PERSISTENT CLOUD COVER AND COLD
ADVECTION WILL KEEP TEMPERATURES AT OR BELOW FREEZING NORTH OF
I-70 THIS AFTERNOON/EVENING, WHILE SOUTHERN AREAS ENJOY CLEARER
SKIES AND HIGHS IN THE MID TO UPPER-30S. TONIGHT'S MINIMUM
TEMPERATURES HAVE BEEN ADJUSTED DOWNWARD DUE TO OPTIMAL
RADIATIONAL COOLING CONDITIONS. OVERNIGHT LOWS WILL FALL INTO
THE TEENS/LOW-20S.
SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/
KEY MESSAGES:
- WARMER CONDITIONS MONDAY; POTENTIAL FOR SNOW NORTH OF
PITTSBURGH IN THE AFTERNOON/EVENING
- RAIN AND WINTRY MIX EXPECTED MONDAY NIGHT INTO TUESDAY WITH
LARGE SCALE DISTURBANCE
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HIGH PRESSURE OVER CENTRAL WEST VIRGINIA WILL MAINTAIN COLD,
CALM CONDITIONS BEFORE DAWN MONDAY. BY MID-MORNING, SOUTHERLY
FLOW WILL STRENGTHEN IN RESPONSE TO A DISTURBANCE TRACKING
EASTWARD FROM THE NORTHERN PLAINS/MIDWEST.
A TRACKING SHORTWAVE OVER THE GREAT LAKES MAY TRIGGER LIGHT SNOW
NORTH OF PITTSBURGH DURING THE LATE AFTERNOON HOURS ON MONDAY.
PRECIPITATION IS EXPECTED TO DIMINISH RAPIDLY BETWEEN 19Z AND
21Z (7-9PM) AS THE SSHORTWAVE SHIFTS TOWARD NORTHERN NEW YORK.
THE LEADING EDGE OF A NEW SYSTEM ARRIVES AFTER MIDNIGHT TUESDAY,
BRINGING A MESSY MIX OF WINTRY WEATHER. COLD AIR TRAPPED IN THE
LOW TO MID-LEVELS WILL LIKELY CAUSE SNOW TO TRANSITION THROUGH
SLEET AND FREEZING RAIN BEFORE FINALLY TURNING TO ALL RAIN.
AREAS NORTHEAST OF PITTSBURGH ARE AT A RISK FOR ICY ROADS, AND A
WINTER WEATHER ADVISORY MAY BE ISSUED IN THE NEXT 24 TO 36
HOURS. BY 7AM TUESDAY, CONFIDENCE INCREASES THAT RISING
TEMPERATURES AND DEW POINTS WILL TURN PRECIPITATION INTO A
LIGHT STEADY RAIN.
DRIER AIR WILL BEGIN PUSHING IN FROM THE WEST TUESDAY
AFTERNOON. A FEW ISOLATED SHOWERS MIGHT STICK AROUND EAST OF
PITTSBURGH THROUGH DUSK, THE CLOUDS WILL LIKELY LINGER INTO THE
OVERNIGHT TIME PERIOD DUE TO MOISTURE TRAPPED NEAR THE SURFACE.
LONG TERM /WEDNESDAY THROUGH SATURDAY/
KEY MESSAGES:
KEY MESSAGES:
- A COUPLE DISTURBANCES BRING RAIN AROUND CHRISTMAS.
- HIGHER CHANCES OF THUNDER THAN SNOW ON CHRISTMAS.
- HIGH TEMPERATURE UNCERTAINTY SATURDAY AND BEYOND.
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THERE IS CONTINUED HIGH CONFIDENCE IN A RIDGE IN PLACE FOR MUCH OF
MID-TO-LATE WEEK. ON CHRISTMAS EVE, THE MAIN UNCERTAINTY IN
TEMPERATURES WILL BE THE DEGREE OF TROUGHING IN THE CANADIAN
MARITIMES. IF THE TROUGH IS STRONGER, HIGHS COULD BE AS LOW AS THE
UPPER 30S TO LOW 40S, THOUGH IF THE TROUGHING IS WEAKER,
TEMPERATURES COULD BE AS HIGH AS THE UPPER 40S TO LOW 50S.
OVERNIGHT ON CHRISTMAS EVE, A SHORTWAVE DISTURBANCE IS EXPECTED TO
ROUND THE TOP OF THE RIDGE AXIS WITH HIGH CONFIDENCE IN OCCURRENCE
AND MEDIUM CONFIDENCE IN TIMING. MOST ARES ARE EXPECTED TO SEE LESS
THAN 0.25" OR RAIN, WHEREAS 0.5" WOULD BE THE WETTEST POSSIBLE
SCENARIO NOR NOW. CONSEQUENTLY, WITH THE POTENTIAL FOR SOME ELEVATED
INSTABILITY, THIS ALSO MEANS IT'LL BE MORE LIKELY THE AREA SEES A
THUNDERSTORM OF CHRISTMAS (20%), THAN A WHITE CHRISTMAS (0%).
TEMPERATURE UNCERTAINTY ON CHRISTMAS REMAINS TIED TO THE AMPLITUDE
OF THE DOWNSTREAM EASTERN TROUGH, BUT MOST ENSEMBLES AGREE
TEMPERATURES WILL BE 10-15 DEGREES WARMER THAN CHRISTMAS EVE. THOUGH
WARM, IT WILL NOT BE THE WARMEST CHRISTMAS ON RECORD (67F FROM
1895).
ANOTHER WEATHER SYSTEM IS EXPECTED TO APPROACH ON CHRISTMAS NIGHT
FROM THE NORTHWEST, WHICH WILL LIKELY PRODUCE MORE PRECIPITATION.
MOST ENSEMBLES SHOW AN ADDITION 0.1" TO 0.25" OF RAIN, BUT A FEW
OUTLIERS HAVE UP TO 1" IN THE WETTEST SCENARIO DEPENDING ON LOW
TRACK.
INTO THE FRIDAY AND SATURDAY UNCERTAINTY CONTINUES TO AMPLIFY WITH
UNCERTAINTY IN THE PERSISTENCE AND AMPLIFICATION OF THE EASTERN
TROUGH, OR ITS VERY EXISTENCE ALTOGETHER. NONETHELESS, FRIDAY IS
LIKELY TO BE THE WARMEST DAY OF THE WEEK BEFORE A GENERAL TENDENCY
TO COOL DOWN. THE RATE AT WHICH THIS RIDGE BREAKS DOWN IS UNCERTAIN
THROUGH, WITH AN EVENTUAL COLD FRONTAL PASSAGE EXPECTED SOMEWHERE IN
THE LATE FRIDAY TO EARLY SUNDAY WINDOW. AFTERWARD, A GENERAL COOLING
TREND IS MOST FAVORED INTO NEXT MONDAY.
AVIATION /16Z SUNDAY THROUGH THURSDAY/
KEY MESSAGES:
- VFR CONDITIONS THIS AFTERNOON/TONIGHT WITH HIGH PRESSURE
- RESTRICTIONS RETURN AFTER 00Z TUESDAY WITH A PASSING LOW
PRESSURE SYSTEM; WINTRY MIX AND RAIN EXPECTED
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CONDITIONS ACROSS THE AREA FAVOR A VFR FORECAST THROUGH MUCH OF
THE PERIOD. FKL/DUJ/BVI WILL CONTINUE TO BOUNCE IN THE VFR/MVFR
CIG THRESHOLD IN THE WAKE OF A COLD FRONT FOR THE NEXT 2 TO 3
HOURS.
SFC GUSTS WILL DECREASE LATE THIS EVENING/OVERNIGHT AND TURN
VARIABLE. EXPECT WINDS TO GUST UP TO 25 KNOTS FROM THE NORTHWEST
BEFORE DECOUPLING TONIGHT.
A PASSING SHORTWAVE MAY STIR SNOW NEAR FKL/DUJ MONDAY
AFTERNOON. HOWEVER, CONFIDENCE IS STILL LOW DUE TO SPATIAL
RESOLUTION. IF SNOW DOES OCCUR, IT WOULD MOST LIKELY IMPACT THE
TIME PERIOD OF 18Z TO 23Z MONDAY; CIGS AND VIS COUD DROP TO
MVFR TO IFR.
OUTLOOK...
WIDESPREAD RESTRICTIONS RETURN OVERNIGHT MONDAY INTO TUESDAY
WITH CHANCES OF RAIN AND A WINTRY MIX (MAINLY NORTHEAST OF PIT).
PBZ WATCHES/WARNINGS/ADVISORIES
PA...NONE.
OH...NONE.
WV...NONE.
SYNOPSIS...HEFFERAN
NEAR TERM...HEFFERAN
SHORT TERM...FRAZIER
LONG TERM...FRAZIER
AVIATION...SHALLENBERGER
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