Area Forecast Discussion
Issued by NWS State College, PA

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417 FXUS61 KCTP 250013 AFDCTP Area Forecast Discussion National Weather Service State College PA 813 PM EDT SUN JUL 24 2016 .SYNOPSIS... High pressure will move over and east of the region today, paving the way for a frontal system that will approach overnight and Monday. High pressure will return for mid week. It will remain warm throughout the period. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... MCV and assoc convection moving through sw Pa is the main concern early this evening. Enhanced westerly flow on s flank of this feature is supporting near severe radar velocity signatures across western Pa at 2040Z and linear extrapolation brings the threat into the Laurel Highlands arnd 22Z. Will paint the highest pops over Laurels early this evening, tapering off to the east in anticipation of the convection drying up as it moves east. The overnight will become muggy with the threat for additional sct showers and thunderstorms, but the various models are in wide disagreement on where and when the highest threat will be. && .SHORT TERM /6 AM MONDAY MORNING THROUGH 6 PM MONDAY/... Monday looks hazy hot and humid with dewpoints well up in the 60s and possibly even lower 70s over the southeast where the combination of heat and humidity warrants a heat advisory for the warmest hours of the afternoon. A weak cold front will provide enhanced convergence in an increasingly unstable airmass leading to the threat for some strong storms, especially in the afternoon when the SREF and GEFS pump CAPEs up to between 1500-2000J with a not unimpressive LLJ sliding into the forecast area. Any rain Monday will be very welcome, but probably not enough to put a dent in the widespread dry conditions we have been experiencing for the last several weeks. && .LONG TERM /MONDAY NIGHT THROUGH SUNDAY/... Big story in the extended fcst is the expected heat wave lasting into early in the upcoming week, as the axis of the subtropical ridge briefly shifts from the plains to the northeast conus. Anomalous upper lvl ridging building over PA should bring hot and mainly dry wx this weekend, as warm temps aloft suppress convection. Some modest cooling appears likely by Tue/Wed of next week behind weak cold front. However, temps still likely to remain somewhat abv normal within a generally zonal flow. Midweek weather looks dry again, with just low pops for isolated tstms. Fri looks to be the next higher chance for tstm impacts areawide as another cool front progged to move through. && .AVIATION /00Z MONDAY THROUGH FRIDAY/... 00Z TAFS sent. Several more hours of showers and storms to the east and south, as the remains of the convection system over western Centre County trigger more showers and storms to the east and south. Otherwise most of the night will be dry with VFR conditions. Perhaps some fog and haze just before sunrise. More showers and storms will be possible on Monday, highest chance for strong storms would be to the east, given timing of the cold front. High pressure returns for Tuesday and Wednesday. OUTLOOK... TUE-WED...AM fog poss. Otherwise VFR. THU-FRI...Mainly VFR. SCT PM SHRA/TSRA. && .CLIMATE... Record high in both IPT and MDT for today is 96F. So far in Harrisburg today the high has been 95 degrees. So far in Williamsport today the high has been 94 degrees. && .CTP WATCHES/WARNINGS/ADVISORIES... Heat Advisory from 3 PM to 8 PM EDT Monday for PAZ027-028-035- 036-056>059-063>066. && $$ SYNOPSIS...La Corte NEAR TERM...Fitzgerald/La Corte SHORT TERM...La Corte LONG TERM...Lambert/Gartner AVIATION...Martin CLIMATE...La Corte/Martin is the U.S. government's official web portal to all federal, state and local government web resources and services.