Area Forecast Discussion
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000 FXUS61 KPBZ 261617 AFDPBZ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1217 PM EDT WED AUG 26 2015 .SYNOPSIS... COOLER CONDITIONS AND SPARSE SHOWER CHANCES CAN BE EXPECTED UNTIL HIGH PRESSURE BEGINS TO REBUILD ON FRIDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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NO APPRECIABLE CHANGES WERE NEEDED FOR THE NOON UPDATE OTHER THAN TO TWEAK HOURLY TRENDS BASED ON THE LATEST RADAR...OBS...AND HIGH RES MDL TRENDS. PREVIOUS... TROUGH AXIS WILL DRIFT THROUGH THE AREA TODAY KEEPING IN CLOUDS AND THE RISK FOR SHOWERS...MAINLY ACROSS THE NORTHERN HALF. TEMPERATURES WILL REMAIN BELOW SEASONABLE LEVELS.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/... THE CLOSED UPPER LOW...TO THE NORTH OF THE GREAT LAKES...WILL BEGIN FILLING IN ON THURSDAY. ANOTHER SHORTWAVE....SWINGING SOUTHWARD IN THE NORTHWEST FLOW ALOFT...WILL CROSS THURSDAY AFTERNOON. THIS SHOULD PROMOTE CU DEVELOPMENT AND KEEP TEMPERATURES BELOW NORMAL. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... 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 SATURDAY NIGHT AND SUNDAY. SURFACE HIGH PRESSURE RETURNS NEXT WEEK. && .AVIATION /16Z WEDNESDAY THROUGH SUNDAY/...
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THE UPPER TROUGH AXIS WILL SWING ACROSS THE AREA TODAY...WITH PLENTY OF CLOUDS...ALTHOUGH MVFR CIGS WILL GENLY BE CONFINED TO TERMINALS NORTH OF PIT ALONG WITH SOME SCATTERED LIGHT SHOWERS. EXPECT VFR AT ALL PORTS LATER IN THE AFTERNOON...WITH SHOWER CHANCES ENDING BY SUNSET. DEPENDING ON AMOUNT OF CLEARING TONIGHT...THERE IS BETTER POTENTIAL FOR AT LEAST PATCHY MVFR/IFR FOG AT SOME LOCATIONS DURING THE THURSDAY PREDAWN HOURS. OUTLOOK...THURSDAY 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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