Area Forecast Discussion
Issued by NWS Pittsburgh, PA

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000 FXUS61 KPBZ 060330 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 1130 PM EDT Thu Aug 5 2021 .SYNOPSIS... Seasonably warm weather is expected over the next few days with isolated to scattered afternoon showers. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
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A quiet night in terms of weather is underway across the Upper Ohio Valley and Allegheny Mountains. GOES East imagery shows a nearly clear sky across the area thanks to high pressure. Will be monitoring the forecast area for fog formation tonight. Thinking fog will be less than previous nights as near-surface air is a bit drier than recent nights, but a clear sky and lack of wind will optimize overnight cooling. Temps will fall to between the mid 50s and mid 60s by dawn.
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&& .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/... Large scale ridging, with lack of any forcing for ascent will allow for a quiet, warm day on Friday. Vorticity advection will propagate into the Ohio Valley on Saturday, which, combined with surface heating and moisture will allow for the chance for thunderstorms. It remains uncertain the amount of shear that will be present, and thus the potential for strong storms is to be determined. Temperature will remain warm, with dew points climbing through the period. && .LONG TERM /SUNDAY THROUGH THURSDAY/... Early week appears quiet but hot under strong high pressure with temperature likely pushing 90 for most. Long range models indicate the possibility for a trough undergoing cyclogenesis in the Great Lakes to impact the Ohio Valley. && .AVIATION /04Z FRIDAY THROUGH TUESDAY/... VFR is expected through the TAF period under shortwave ridging. CU rule/model soundings indicate a scattered diurnal CU field should develop again Friday. .Outlook... Restrictions are possible Sat with a crossing upr trough, and with aftn/eve convection Tue. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. && $$

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