014
FXUS61 KPBZ 020620
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
220 AM EDT FRI OCT 2 2026
WHAT HAS CHANGED
NO MAJOR CHANGES TO THE FORECAST THROUGH THE WEEKEND. FROST
POTENTIAL EARLY NEXT WEEK IS LOOKING MORE LIKELY.
KEY MESSAGES
1) SHOWERS RETURN WITH A FRIDAY COLD FRONT, WITH NO NOTABLE
THREATS FOR HEAVY RAIN OR SEVERE THUNDERSTORMS.
2) COOLER AND MAINLY DRY FROM THIS WEEKEND INTO EARLY NEXT WEEK.
FROST IS A POSSIBILITY TUESDAY AND WEDNESDAY MORNINGS, MAINLY
NORTHEAST OF PITTSBURGH.
DISCUSSION
KEY MESSAGE 1...
A TROUGH OVER THE CENTRAL PLAINS WILL BEGIN TO EJECT EAST TODAY
AS THE TROUGH LIFTS INTO THE OH VALLEY DURING THE DAY ON FRIDAY.
A RIDGE WILL BE PRESENT OVER THE SOUTHEAST/EASTERN CONUS AS THIS
WILL SLOWLY IMPEDE AND WEAKEN THE FRONT AS IT APPROACHES. IN
FACT, THE NORTHERN END OF THE RAIN SHIELD THE ENSEMBLES ARE
ADVERTISING SEEMS TO SHEAR OUT AND DISSIPATE THE PRECIPITATION A
BIT. THE NBM SHOWS ROUGHLY 50% TO 70% OF EXCEEDING 0.25" OVER IN
OUR OHIO COUNTIES BUT ITS MORE AROUND 30% TO 50% FOR THE PA AND
WV COUNTIES. THIS MAKES SENSE AS THE FRONT SEEMS TO DETERIORATE
BY THE TIME IT BEGINS TO PUSH INTO PA.
THAT SAID, THE PROBS FOR SB CAPE TO EVEN EXCEED 250 J/KG IS ONLY
30% TO 50% AND THIS AREA IS SOUTHEAST OF PITTSBURGH. THE OTHER
FACTOR IS THAT THE SPC ONLY HAS A GENERAL THUNDER AREA FOR THE
AREA SOUTH OF I-70. THE WPC DOES NOT HAVE A MARGINAL OUTLOOK FOR
THE AREA FOR FRIDAY EITHER. THUS NO IMPACTS ARE EXPECTED,
ALTHOUGH, THE 850 MB WINDS ADVERTISE A 30 TO 40 KNOT LL JET.
THIS MIGHT BE ENOUGH TO GET A FEW WIND GUSTS OF 20 TO 30 KNOTS
THROUGH THE DAY TODAY BUT THAT WOULD BE THE EXTENT. ALSO THE NBM
PROBS GIVE A 30% TO 50% PROBABILITY FOR WIND GUSTS ABOVE 25 MPH
AND EVEN HIGHER ON THE RIDGES.
KEY MESSAGE 2...
MODEL ENSEMBLES INDICATE BROAD UPPER TROUGHING SHOULD PERSIST
ACROSS THE NE CONUS FROM THE WEEKEND INTO THE MIDDLE OF NEXT
WEEK. A SOUTHERN STREAM SHORTWAVE COULD BRING A FEW SHOWERS TO
AREAS SOUTH AND EAST OF PITTSBURGH ON SUNDAY. THIS DISTURBANCE WOULD
BE FOLLOWED BY AN INFLUX OF COOLER AIR INTO THE REGION, DROPPING
TEMPERATURES BELOW CLIMATOLOGY EARLY NEXT WEEK WHILE ANOTHER RUN
OF DRY WEATHER BEGINS THANKS TO HIGH PRESSURE.
ONE THING TO WATCH WILL BE THE POTENTIAL FOR FROST BOTH TUESDAY AND
WEDNESDAY MORNINGS TO THE NORTHEAST OF PITTSBURGH, AS WELL AS
IN THE USUAL LAUREL HIGHLAND/NORTHERN WEST VIRGINIA COLD SPOTS.
THE NBM PAINTS A 50% TO 75% CHANCE OF LOW TEMPERATURES COLDER
THAN 37 DEGREES NORTH OF US-422 BOTH MORNINGS - WHICH WOULD BE
CHILLY ENOUGH FOR AT LEAST PATCHY FROST GIVEN CLEAR AND CALM
OVERNIGHT CONDITIONS. TEMPERATURES FROM WEDNESDAY ON SHOULD
BUILD BACK TOWARDS MORE SEASONAL VALUES.
AVIATION /06Z FRIDAY THROUGH TUESDAY/
VFR IS EXPECTED THROUGH MOST OF THE NIGHT WITH RELATIVELY LIGHT
WINDS AND SLOWLY LOWERING CEILINGS THROUGH DAWN. A COLD FRONT IS
EXPECTED TO PUSH EAST AND BRING SHOWERS INTO THE REGION BY THE
14Z TO 16Z TIMEFRAME. WILL THEN EXPECTED MVFR CIGS AND VIS WITH
THE APPROACHING SHOWERS.
THROUGH THE COMING DAY, EXPECTED THE RESTRICTIONS TO CONTINUE
INTO THE AFTERNOON WITH THE MOISTENING OF THE ATMOSPHERE, LIFR
CIGS MAY DEVELOP AS SOON AS THE 17Z TO 19Z PERIOD ACROSS THE
AREA. CONDITIONS ARE EXPECTED TO IMPROVE AFTER 00Z TONIGHT WITH
MOST LOCATIONS SEEING AN END OF THE RAINFALL BY 06Z.
WINDS ARE EXPECTED TO BE SOUTHWEST THROUGH THE OVERNIGHT AND
INTO THE COMING DAY. WITH THE LOW LEVEL JET IN PLACE, SOME SITES
COULD SEE SOME WIND GUSTS UP TO 25 KNOTS. WINDS WILL THEN SHIFT
TO THE NORTHWEST BY THE 20Z TO 22Z PERIOD.
OUTLOOK...
BOUNDARY MAY STALL JUST SOUTH OF I-70 WITH SOME POTENTIAL
RESTRICTIONS SAT AND SUN AT THE SOUTHERN TERMINALS. OTHERWISE,
VFR IS PROGGED OUTSIDE OF ANY MORNING FOG.
PBZ WATCHES/WARNINGS/ADVISORIES
PA...NONE.
OH...NONE.
WV...NONE.
DISCUSSION...SHALLENBERGER
AVIATION...SHALLENBERGER
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