Area Forecast Discussion
Issued by NWS State College, PA

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000 FXUS61 KCTP 232236 AFDCTP Area Forecast Discussion National Weather Service State College PA 636 PM EDT Sun Oct 23 2016 .SYNOPSIS... A cold front will pass through tonight and early Monday bringing a cold rain to the northern half of the state. A reinforcing shot of cold air will follow and last through mid week. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
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Cu field will disappear for the most part this evening. But a low-amplitude fast-moving wave will cross the upper Great Lakes this evening and move across NY/PA early tonight. Weak low pressure will ripple across at the sfc and drag a cold front thru around 03Z in the NW and by 12Z SE. A streak of rain of 0.25-0.5" is expected across the northern third of the area, while lower amounts will fall as far S as FIG-UNV-IPT. However, not much rain is expected S of that line. Will keep a few hundreths in the QPF grid in the central mtns for 06-12z. NW flow will make isold- sct shra in the Laurels in that same time frame. Temps will drop as the rain starts in the NW, and diminish more-normally across the rest of the area, as the timing of the front is mainly with the normal nocturnal trend. Mins in the 40s widespread tonight as the SE will be mainly cloud-free and drop more than the cloudy/wet nrn tier.
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&& .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... NW post-frontal flow will keep isold-sct shra for the usual suspects on Monday. High pressure stays to the W thru the short- term and the tight pres grad will keep it breezy. Temps will only rise 6-8F on Mon in the NW, and 10-15F in the SE under constant but weak cold advection. The flow lasts into Mon Night, and the temps get cold enough then to get a mix or plain ol` --sn for precip type in the higher elevation of the nrn mtns. As with last night, no accums expected with still-warm ground and very light/sct precip. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Surface high pressure gradually works in from the Great Lakes Tue into Wed keeping below normal temperatures in place. Cyclonic flow/cold air aloft on Tue may bring enough instability to kick off a few light showers in the NW mountains. CAA comes to an end on Wed as weak progressive upper ridge moves through as low-level flow turns back to the S/SW. Could see a decent frost Wed morning as dewpoints bottom out. A compact low developing over the Midwest will already be knocking on our door by Thu. Drier air remains in place over the east Wed night, but expect showers to work into the west overnight. Rain becomes likely for much of the area on Thu. Model guidance continues to diverge after that, especially at the surface, so confidence in next weekends forecast remains rather low. But a look at the upper pattern suggests general NW flow keeping a steady stream of cooler air feeding into the region, with a series of shortwave troughs sliding through. && .AVIATION /22Z SUNDAY THROUGH FRIDAY/...
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A fast-moving low pressure system over the Grt Lks will track across Northern Pa tonight, bringing a period of rain to that part of the state. A core of strong winds aloft will precede this system, likely resulting in LLWS overnight across much of Central Pa. The exception may be at KJST, where climatology and model soundings suggest the strong winds will mix to ground level, resulting in wgusts to around 35kts. The threat of LLWS should end from north to south after midnight, as strong winds aloft slip south of the state. The other concern will be the possibility of low cigs overnight at KBFD and KJST, as plume of low level moisture ahead of trailing cold front ascends the higher terrain of West Central Pa. Model soundings indicate a possibility of tempo IFR cigs at KBFD between 04Z-12Z and at KJST between 08Z-14Z. Moisture flowing off of Lk Erie will produce fairly widespread stratocu across Central Pa on Monday. Model soundings suggest MVFR cigs could linger most of the day at KBFD/KJST, while predominantly VFR conds expected elsewhere. Outlook... Mon Night-Tue...MVFR/sct -shrasn N/W. VFR elsewhere. Wed...No sig wx. Thu...Widespread showers. Fri...MVFR/sct -shra N/W. VFR elsewhere.
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&& .CTP WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...Dangelo NEAR TERM...Dangelo SHORT TERM...Dangelo LONG TERM...RXR AVIATION...Dangelo/Fitzgerald is the U.S. government's official web portal to all federal, state and local government web resources and services.