


Area Forecast Discussion
Issued by NWS State College, PA
Issued by NWS State College, PA
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-- Discussion containing changed information from previous version are highlighted. --304 FXUS61 KCTP 090850 AFDCTP Area Forecast Discussion National Weather Service State College PA 450 AM EDT Wed Jul 9 2025 .SYNOPSIS...-- Changed Discussion --* Scattered damaging wind gusts and flash flooding are possible across portions of south central and southeastern Pennsylvania this afternoon and evening * Continued seasonably warm and humid into mid July with daily chances for afternoon and evening thunderstorms-- End Changed Discussion --&& .NEAR TERM /THROUGH TONIGHT/...-- Changed Discussion --Areas of fog and low clouds early this morning will give way to a mix of clouds and sunshine. Max temps will be in the 80-90F range from NW to SE with slightly reduced humidity levels based on sfc dewpoints trending about 5 degrees lower vs. Tuesday. 500mb trough will move slowly eastward today across the Great Lakes/Ohio Valley. HREF data depicts a belt modestly enhanced southwesterly mid level flow that will contribute to slightly higher bulk shear values ~30kts than in recent days. This may be offset to some extent by drier/less humid air that will result in lower instability/CAPE across most of CPA. The area to watch will be over the southern tier particularly into the lower Susq Valley given juxtaposition of max CAPE/shear and 1.5-2" PWAT. Latest CAMs show T-storms initiating over far southwest PA into WV as shortwave energy rotates into the Upper Ohio Valley then ramps up in both coverage and intensity spreading eastward to the I-95 corridor by 00Z. For now, there appears to be a stronger signal for a heavy rain axis and corresponding flash flood risk farther to the south over northern MD, but we issued a flash flood watch from Adams to Lancaster County which could be impacted especially if convection trends farther to the north and west through the day. Showers and storms could persist into the overnight period in parts of south central/southeast PA before shifting to the north/east after 06Z.-- End Changed Discussion --&& .SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...-- Changed Discussion --Diurnal heating of a seasonably moist and weakly capped boundary layer will result in afternoon thunderstorms through late week over CPA. Precipitable water values look to trend lower vs. previous days. This will reduce the excessive rainfall and flash flood risk while remaining sufficient to support the potential for wet downbursts and isolated wind damage. SPC has maintained a level 1 marginal risk for both D2/Thu and D3/Fri. Typical mid July summertime temperatures expected with daytime highs in the 80-90F range and lows 60-70F.-- End Changed Discussion --&& .LONG TERM /SATURDAY THROUGH TUESDAY/...-- Changed Discussion --Daily chances for afternoon/evening thunderstorms continue over the weekend and into early next week with max/min temps trending near to slightly above normal for mid July.-- End Changed Discussion --&& .AVIATION /07Z WEDNESDAY THROUGH SUNDAY/... In the wake of a cold front, areas that have received locally heavy rainfall this evening will have higher potential for fog and widespread visibility restrictions overnight. At this time, have progged AOO/UNV towards LIFR conditions overnight; however, model guidance indicates some potential at all airfields except for MDT/LNS. Have stuck with guidance trends; however, will have to continue to monitor trends at MDT/LNS with heavy rainfall and fog potential overnight. After sunrise on Wednesday (12Z Wed - 18Z Wed), model guidance shows fair agreement with respect to restrictions being lifted by 12Z for most airfields. The 18Z TAF package does set the goal post slightly wider, with widespread restrictions lifting closer to 13-14Z give some lingering low-level moisture in RAP model soundings. Outlook... Wed...Best chance for storms and restrictions in southern PA. Thu-Sun...Potential for showers and thunderstorms, mainly aftn/eve. && .CTP WATCHES/WARNINGS/ADVISORIES...-- Changed Discussion --Flood Watch from this afternoon through this evening for PAZ064>066.-- End Changed Discussion --&& $$ SYNOPSIS...Steinbugl NEAR TERM...Steinbugl SHORT TERM...Steinbugl LONG TERM...Lambert/Colbert AVIATION...NPB/RXR