Area Forecast Discussion
Issued by NWS Pittsburgh, PA

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000 FXUS61 KPBZ 282043 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 443 PM EDT Wed Oct 28 2020 .SYNOPSIS... Widespread rain will plague the early Thursday. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... No appreciable change was needed for the eve update as warm moist advection is underway to fuel increasing rain chances with the encroachment and interaction of tropical remnants with the northern stream jet. Rain will begin after midnight - progressing from south to north. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY/... The remnants of Zeta will be interacting with the northern stream jet/encroachment of a cold front to produce widespread rain ovr the Upr OH. Expect one to two inches north to south, with locally higher amounts over the WV ridges. As this rain will be over a 36 hour period, and given low river and stream levels, flooding issues are not anticipated. Cold advection in the wake of the system may change residual rain to snow on Friday, especially over the I 80 corridor. The ground is too warm to support appreciable accumulation. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... The air mass rushing into the area behind the massive system on Friday will lead to some much colder temperatures Friday night into Saturday morning. Expect dry conditions Saturday as sfc high pressure transitions over the forecast area. The next upper trough and associated cold front are progged to impact the region Sunday...bringing another chance for rain followed by possible snow Sunday night with strong cold advctn behind the trough axis. Strong longwave ridging is then projected to dry and warm the region. && .AVIATION /21Z WEDNESDAY THROUGH MONDAY/... The approach and passage of the remnant tropical low to the southeast will spread MVFR to LIFR restrictions northward Thursday morning amidst light to moderate rain. Little change in conditions is expected through the day outside of an increasing E/NE wind in response to the tightening sfc pressure gradient. .Outlook... Conditions will slowly improve Friday as dry NW flow and sfc high pressure replace the exiting low. Additional restrictions are likely Sunday with the passage of the next low pressure system. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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