Area Forecast Discussion
Issued by NWS

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FXUS61 KPBZ 251845
AFDPBZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
245 PM EDT TUE AUG 25 2015

.SYNOPSIS...
COOLER CONDITIONS AND SPARSE SHOWER CHANCES CAN BE EXPECTED UNTIL
HIGH PRESSURE BEGINS TO REBUILD FOR THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
CLOUD COVER INCREASED DRAMATICALLY AS COLD AIR ASSOCIATED WITH THE ENCROACHING
UPPER TROUGH HAS SEEPED OVER THE UPPER OHIO REGION TODAY. A FEW
SHOWERS ARE STILL POSSIBLE TO THE NORTH OF I 80 AS THE PUDDLE OF
COLDER MID LEVEL AIR SLIDES EASTWARD EARLY THIS EVE. OTHERWISE...AN
EXTENSIVE MID LEVEL CLOUD BLANKET SHOULD PERSIST INTO THE NIGHT
DESPITE THE LOSS OF DAYTIME WARMTH. LOWS ABOUT 5 TO 10 DEGREES
UNDER THE AVERAGES STILL LOOK FINE SO NO MAJOR CHANGES WERE NEEDED
TO THE NEAR TERM FORECAST.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/...
THE CLOSED UPPER LOW TO THE NORTH OF THE GREAT LAKES THROUGH IS
FORECAST TO BEGIN FILLING ON THURSDAY. IN THE MEANTIME...SHORT-
TERM TEMPERATURES WILL REMAIN 5 TO 10 DEGREES BELOW THE SEASONAL
AVERAGES WITH COOL REINFORCEMENT VIA ANOTHER SHORTWAVE ON WEDNESDAY.

SLIGHT TO CHANCE POPS AND EXTENSIVE CLOUD COVER WERE MAINTAINED
FOR COUNTIES NORTH OF I 70 FOR PASSAGE OF THAT FEATURE...WITH
IMPROVEMENT ANTICIPATED ON THURSDAY AS THE HIGH BEGINS TO BUILD.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
MODEL GUIDANCE IS IN RELATIVELY GOOD AGREEMENT WITH THE FILLING OF
THE EASTERN CONUS UPPER TROUGH BY FRIDAY AND A SHORTWAVE TROUGH
APPROACHING THIS WEEKEND. THIS WILL SUPPORT A TEMPERATURE MODERATION
TO...THEN ABOVE THE AVERAGES...ALTHOUGH INCREASED MOISTURE IN THE
DEVELOPING SOUTHWEST FLOW COULD LEAD TO DIURNAL SHOWERS AND
THUNDERSTORMS BY SUNDAY.

&&

.AVIATION /18Z TUESDAY THROUGH SUNDAY/...
GENERAL VFR IS EXPECTED FOR UPPER OHIO TERMINALS THROUGH WEDNESDAY...ALTHOUGH
AN EMBEDDED DISTURBANCE/REINFORCING FRONT MAY SPAWN SOME MVFR STRATOCU
OVER NORTHERN PORTS WITH ITS APPROACH TONIGHT...AND SOME ISOLATED
TO SCATTERED SHOWERS WITH PASSAGE ON WEDNESDAY.

OUTLOOK...WEDNESDAY NIGHT THROUGH SUNDAY... NO EXTENSIVE IFR IS
EXPECTED THROUGH THE WEEKEND.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.

&&

$$
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