Area Forecast Discussion
Issued by NWS State College, PA

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885 FXUS61 KCTP 281248 AFDCTP Area Forecast Discussion National Weather Service State College PA 848 AM EDT SAT MAY 28 2016 .SYNOPSIS... A ridge of high pressure will remain centered over Pa today and Sunday. A trough of low pressure will push across the region late Sunday into early Monday. High pressure will build into the region early next week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Subtropical ridge centered off the e coast will expand nwwd into Pa today, with 500mb height anomalies reaching 2SD across southeast Pa. The assoc warm temps aloft should suppress convection across the se counties this aftn. However, sct diurnal tsra appear likely across the remainder of central Pa. Thermodynamic/kinematic profiles appear very similar to those of Friday, with moderate sfc-based cape of 1500-2500 j/kg and weak shear, suggesting pulse-type convection and a low risk of organized svr wx. Although most locations will likely miss out on rainfall, slow moving tsra will likely produce localized rain amts of arnd 2 inches in a few spots, as implied by ncar high res ensemble output. Ens mean 8h temps near or slightly higher than those of Friday, so have added a degree or two to max temps, which should range from the m80s ovr the Allegheny Mtns, to arnd 90F across the Susq Valley. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... Diurnally-driven convection should rapidly die out after sunset. Focus will then shift to potential of patchy fog in those locations that receive rain later today. Increasing high and mid lvl cloudiness expected Sunday in advance of shortwave lifting out of the midwest, which should hold temps down a bit. Superblend max temps ranging from the u70s ovr the Alleghenies to l80s Susq Valley. As lg scale forcing ramps up ahead of shortwave, expect an increasing chc of pm tsra, mainly across the western counties. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Although tropical depression is progged to remain well south of Pa, a plume of tropical moisture lifting up the mid atl coast, combined with approach of mid lvl shortwave from the west, could produce some locally sig rainfall Sun night across eastern Pa. GEFS and oper GFS/EC all indicate the potential of 1+ inches of rain Sunday night across our se counties. Some uncertainty with regards to how fast shortwave and assoc weak cold front clear the area Monday. Trend has been for a more progressive shortwave resulting in a dry Memorial Day. However, the slower 00Z EC solution still suggesting showery wx could linger across the se half of the state. Deterministic and ensemble guidance are in broad agreement in a period of fair/warm weather from Tuesday into Wednesday before pcpn risk gradually increases late in the week ahead of 5h trof and assoc cold front approaching from the Grt Lks. && .AVIATION /13Z SATURDAY THROUGH WEDNESDAY/... Low conditions at the 3 eastern sites just after sunrise...but improving fast now. Ridge of high pressure remains in control, keeping a summertime weather pattern in place. Vsby reductions to MVFR likely around sunrise with humidity continuing to gradually increase, with a few areas of IFR fog mainly confined to places that receive rain Fri aft. Any reducing conditions will lift between 12Z to 14Z. Ridge will suppress convection and keep cumulus thin in the southeast this afternoon. Chance for showers and thunderstorms will be confined mainly to NW half. Overall conditions will remain VFR, with local reductions in sct convection. OUTLOOK... Sun...Sct afternoon tsra impacts...mainly nw half. Sun night...Reductions likely mainly se half in showers/tstms. Mon...Sct tsra impacts...mainly se half. Tue and Wed...No sig wx. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && $$ SYNOPSIS...Fitzgerald NEAR TERM...Fitzgerald SHORT TERM...Fitzgerald LONG TERM...Fitzgerald/Gartner AVIATION...Martin/RXR is the U.S. government's official web portal to all federal, state and local government web resources and services.