Area Forecast Discussion
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000 FXUS61 KPBZ 251845 AFDPBZ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 245 PM EDT TUE AUG 25 2015 .SYNOPSIS...
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COOLER CONDITIONS AND SPARSE SHOWER CHANCES CAN BE EXPECTED UNTIL HIGH PRESSURE BEGINS TO REBUILD FOR THE WEEKEND.
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&& .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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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.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/...
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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.
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&& .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
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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.
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&& .AVIATION /18Z TUESDAY THROUGH SUNDAY/...
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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.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && $$ 15

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