Area Forecast Discussion
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000 FXUS61 KPBZ 232240 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 640 PM EDT Wed Aug 23 2017 .SYNOPSIS... A reinforcing cold front is expected to generate some showers on Thursday. Weekend weather will feature cool and dry conditions with high pressure. && .NEAR TERM /THROUGH THURSDAY/...
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No changes were needed for the early eve update. Previous... A couple of shortwaves moving into the base of the digging Eastern CONUS trough will reinforce the cool airmass tonight and generate some light showers on Thursday, when boundary layer warming steepens low level lapse rates sufficiently for some shallow convection. Near term temperatures are projected 5 to 10 degrees below the averages with this flow pattern.
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&& .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... A broad upper trough in the ern CONUS will dominate the wx pattern through much of the remaining forecast as an upper ridge amplifies in the central CONUS. Surface high pressure under northwest flow aloft will maintain dry and cool condition for the Upper Ohio Region through the weekend. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... A high-confidence wx pattern is predicted through early next week, as surface high pressure builds swd from the Great Lakes amid an amplifying ridge in the central CONUS. The Ohio Valley will lie between this ridge and the persistent upper trough on the east coast. The resultant nly flow will maintain temperature below seasonal average into the middle of next week. By next Tuesday, moisture streaming from the Gulf in association with tropical system Harvey may provide a canopy of high clouds and an increasing chance of light rain. && .AVIATION /00Z THURSDAY THROUGH MONDAY/... VFR conditions are expected through tonight, but MVFR restrictions are possible Thursday with the encroachment of an upper level trough. .Outlook... General VFR is expected until early next week. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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