Area Forecast Discussion
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000 FXUS61 KPBZ 200813 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 413 AM EDT Wed Sep 20 2017 .SYNOPSIS... A scattered shower or storm is possible south and west of Pittsburgh this afternoon. Warm and humid conditions will continue into early next week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Short wave trough will remain to the west of most of the region today, stretching from Western Lake Erie southward through Central/Western Ohio and into Kentucky. This large scale ascension and a modestly unstable atmosphere, may be enough to fire scattered showers and storms this afternoon. Warm mid levels and subsidence should keep activity suppressed to the east of the trough. Another warm day with temperatures well above normal. && .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/... Shortwave will phase out tonight as upper level heights begin to rise in earnest. Upper level ridging will become even more firmly entrenched over the Ohio Valley/Great Lakes through the end of the week as a deep trough digs over the Western U.S.. This will lead to dry weather and further warming through Friday. Highs in the mid 80s will be common. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... Little change in the large-scale circulation pattern is expected during the extended period, with the western trough/eastern ridge setup maintaining, if not strengthening, through early next week. As a result, a dry and quite warm forecast continues. With 850mb temps soaring to the 17-19C range, most locations outside of the ridges will rise well into the 80s. && .AVIATION /08Z WEDNESDAY THROUGH SUNDAY/... Fog development possible as has been the case for several nights, however, cloud coverage along and west of the PA/OH border will limit development over those areas. AGC/FKL/DUJ/MGW/LBE should see IFR vis restrictions develop again overnight under limited cloud coverage. .Outlook... Other than local morning fog, no widespread restrictions expected through Sun with building ridging. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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