Area Forecast Discussion
Issued by NWS State College, PA

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000 FXUS61 KCTP 232122 AFDCTP Area Forecast Discussion National Weather Service State College PA 522 PM EDT MON MAY 23 2016 .SYNOPSIS... The slow moving storm system that brought rainy cool weather all weekend will slowly edge away from the region today and Tuesday. A noticeably warmer and more summer-like pattern is forecast from mid week into the holiday weekend. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... Showers are developing as expected with the more organized band over Schuykill County. This band is headed toward the Harrisburg area and showers are forming west of it. There is a good chance of showers and thunderstorms in the York-Harrisburg-Lancaster area in the next few hours. HRRR gets these out after about 5-6 PM. A second band is less organized over central areas and shows less organization. Cannot rule out isolated showers this afternoon in central areas through late afternoon. Farther north and west chance of showers is very low. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/... Most areas will clear out overnight. In areas of rain this afternoon increased chance patchy valley fog. Tuesday looks to be a generally good day. Low probability of precipitation. Mostly sunny day. && .LONG TERM /TUESDAY NIGHT THROUGH MONDAY/... Extended guidance continues the idea the development of an eastern ridge/western trough pattern, bringing the arrival of the first extended period of summer-like temperatures and humidity. By Wednesday... central PA will be under rising heights as the low lifts out and the ridge bulges east. At the same time a weakening back door cold front will be sliding out of Canada into the rising heights aloft. The models use this to develop scattered showers and thunderstorms Wed afternoon and evening. Precip confidence is never terribly high with surface fronts moving into ridges aloft. By Thursday we will be embedded in a broad wsw flow aloft. Slightly above normal PWATS support the idea that humidity will become noticeable over most of the area for the first time this warm season. It also means we will be susceptible to mainly afternoon convection pretty much on a daily basis into the weekend. The limiting factor will be the eventual sharpness of the upper ridge and how warm we manage to get aloft. The GFS is very aggressive poking the Bermuda ridge strongly up over the eastern U.S. Saturday while the ECMWF is a little flatter. The NAEFS is more in line with the GFS which hints that Saturday could be the day with smallest convective chances. I don`t have anything more than chance pops in the extended given the muddy nature of the ridge and low confidence that it will be able to shield us from upstream convection that will be embedded in the flow. The highest confidence part of the forecast is for temperatures to be above normal through the end of the month. && .AVIATION /21Z MONDAY THROUGH SATURDAY/...
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Sct shra/tsra across the southern half of Pa will dissipate with loss of heating this evening. A brief vis reduction remains possible thru arnd 01Z across the southern airfields. Focus for late tonight will shift to the possibility of patchy fog, mainly where rain fell during the aftn/evening hours. Both the 15Z SREF and 18Z downscaled NAM indicate this potential of patchy fog across southern Pa late tonight and early Tue am. Widespread VFR conds expected Tuesday, as a ridge of high pressure builds in from the west. OUTLOOK...Tuesday-Friday 5/24-5/27 Tue-Wed...VFR/No sig wx expected. Thu-Fri...Chance of mainly P.M. showers/tstms.
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&& .CTP WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...La Corte NEAR TERM...Grumm SHORT TERM...Grumm LONG TERM...RXR AVIATION...Grumm/Fitzgerald

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