Area Forecast Discussion
Issued by NWS State College, PA
Issued by NWS State College, PA
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927 FXUS61 KCTP 051547 AFDCTP Area Forecast Discussion National Weather Service State College PA 1147 AM EDT Sun May 5 2024 .SYNOPSIS... -Rain tapers to showers and a few thunderstorms to close out the first weekend of May -Warmer and drier on Monday; increasingly unsettled Tue-Fri -Late week cooling trend continues through Mother`s Day weekend && .NEAR TERM /THROUGH TONIGHT/... No major changes to this morning`s forecast with 850mb jet driving light/mdt rain from southwest to northeast across CPA. Expect the steadier rain to shift to the east with time giving way to a more showery regime for later today through tonight. CAD pattern with a moist east southeast upslope flow and ridgetop fog should reign supreme over the northeastern quadrant of the CWA with highs stuck in the mid to upper 50s. Meanwhile, it looks like the western and southwestern portions of the area will break into the warm sector with cloud breaks allowing temps to reach the 65-70F range. The warmer temps will fuel enough CAPE to mention a t-storm mainly along/west of US219 with a MRGL SWO (1/5) from the SPC still clipping Warren County. Rather mild tonight as a weak cold front presses southeast from Lake Erie. Some lingering showers are possible especially near the front. Guidance remains bullish on low clouds and fog development overnight which may become locally dense in spots into early Monday morning. Fcst lows are +10-15F above climo for early May in the low 50s to near 60F. && .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... A.M. low clouds and fog should give way to some sun by Monday afternoon especially across the northern half of CPA as high pressure over the eastern Great Lakes directs drier/lower pwat air into the region. Following a rather cool and damp weekend, temperatures are forecast to trend much warmer with fcst maxes getting back into the 70-80F range. The aforementioned frontal boundary settling near the MD line will maintain a low chance of showers/t-storms over the southern tier into Monday night. Expect some fog again Monday night with lows ranging from the mid 40s along the NY border to around 60F in the southern tier. Upper level ridging over PA indicates warm and generally dry conditions are likely Tuesday. However, a warm front lifting out of the Ohio Valley could result in increasing clouds with a PM shower/tsra, primarily across the western counties. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... Unsettled weather will continue into the extended period. Wednesday looks to be another warm day, with ensemble mean 850mb temps of 16C suggesting max temps well into the 80s across the Lower Susq Valley. The best chance for widespread showers and thunderstorms continues to be focused on Thursday, with a deepening upstream trough and sfc low pressure riding up the Ohio Valley and across the area. The surface low and deepest moisture is progged to shift east of the area Thursday night. However, falling heights ahead of the upper trough will likely support scattered diurnal convection Friday and Saturday, along with a downward trend in temperatures. && .AVIATION /15Z SUNDAY THROUGH THURSDAY/... IFR to low-end MVFR conds are expected to persist across most of Central PA this afternoon, as a moist southeast flow off of the Atlantic persists. However, some modest improvement is possible this aftn along and west of the spine of the Alleghenies, prior to the development of scattered convection. The best chc for TSRA is at JST and possibly BFD, late this aftn into this evening. Areas of fog are likely overnight into Monday morning, with ample low-level moisture and light winds beneath an inversion. LIFR is possible at all TAF sites. Most, if not all, airfields will trend to MVFR or better by Mon afternoon once the AM fog/low clouds dissipate. The Lower Susq Valley may actually be the latest to see improvement on Monday, and there could be a few showers through the aftn. Outlook... Tue...Patchy AM valley fog possible. Isolated SHRA/TSRA possible late across S/W PA. Tues night-Wed...Isolated to scattered SHRA/TSRA possible, esp N/W. Thu...Rain/low cigs expected, with PM TSRA possible. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...Steinbugl NEAR TERM...Steinbugl/Bowen SHORT TERM...Steinbugl LONG TERM...Fitzgerald/Evanego AVIATION...Evanego/Colbert