Area Forecast Discussion
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465 FXUS61 KPBZ 280053 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 853 PM EDT Tue Jun 27 2017 .SYNOPSIS... Cool temperatures are expected tonight under high pressure. Wednesday looks dry, before showers, storms, and warmer temperatures return Thursday and Friday. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
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A quiet night is foreseen as surface high pressure slides across the Ohio Valley. The remaining cumulus will continue to dissipate, with mostly clear skies overnight. Some patchy fog is possible over a few of the rivers in the southeast CWA. Dew points will likely remain too low to support more widespread fog. Cool temperatures a degree or two below statistical guidance are expected, representing values well below normal. See climate section for record values.
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&& .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY/... Ridging will build over the region on Wednesday and temperature will recover to near average with insolation and increased warm advection. Cloud coverage will increase Wednesday night ahead of an approaching shortwave in increasingly zonal flow. The mid-level disturbance will be over the Great Lakes by Thursday afternoon which will likely lead to the development of showers and storms. Have included PoPs on Thursday, generally north of PIT, with likely PoPs over the far north. Temperatures on Thursday will continue to trend up, and winds will be gusty out of the southwest as the pressure gradient tightens. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Models are in general agreement in development of a Mississippi Valley to Eastern CONUS trough this weekend, although actual amplitude and shortwaves-in-flow continue detail and timing discrepancies. The POPS and temperature forecasts are thus close to climo as per a blend of guidance. && .AVIATION /01Z WEDNESDAY THROUGH SUNDAY/... VFR will dominate over the next 24 hours. Cannot rule out some patchy fog very close to the rivers late tonight given the cool temperatures, but due to low dewpoints do not currently think it will be more widespread. Otherwise, the remaining cumulus will dissipate this evening, with mostly clear skies and light winds expected through tomorrow. .OUTLOOK... Restriction chances will increase during the latter half of the week with the approach and passage of a cold front. && .CLIMATE...
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Record low temperatures for June 28th... Pittsburgh: 47 (1988) DuBois: 46 (1970) Zanesville: 46 (1970, 1950) New Philadelphia: 44 (1988) Morgantown: 46 (1988) Wheeling: 43 (1926) Currently, DuBois is the only location expected to approach its record low value, but Pittsburgh may come within a couple of degrees as well.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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