Area Forecast Discussion
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000 FXUS61 KPBZ 131923 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 223 PM EST Fri Dec 13 2019 .SYNOPSIS... Widespread rain is expected tonight and Saturday with crossing low pressure. && .NEAR TERM /THROUGH TONIGHT/... A shortwave embedded in SW flow aloft is expected to track through the Ohio River Valley later this evening. With upper-level support, widespread rain should prevail across the region just before midnight. Wrn MD and Nrn WV is expected to receive 0.75 to 1.00 inches of additional precipitation, where a deep layer of moisture will reside. && .SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/... As the shortwave deepens and cold advection prevails, rain should change to snow late Saturday. No significant accumulation is expected, though colder areas across the higher terrain could see a couple of inches. Snow shower chances should continue in the ridges Sunday with prolong upsloping and residual low-level moisture. A sfc trough advancing across Lake Erie/NW PA may initiate scattered snow showers near I-80. High pressure should return dry weather Sunday afternoon, though snow chances return late night with another approaching Central CONUS trough and associated sfc low. && .LONG TERM /MONDAY THROUGH THURSDAY/... Rain and snow chances return Monday and early Tuesday as the trough and sfc low track across the region. With NW flow prevailing Wednesday through Thursday isolated snow showers could linger due to lake enhancement and upsloping. && .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/... Flight conditions across the region are already at MVFR or IFR as moisture continues to increase due to southwest flow aloft ahead of a Mississippi Valley shortwave. Further deterioration to IFR or lower will occur beginning this evening and into tonight as more widespread precipitation - in the form of rain - arrives thanks to low pressure moving north along the Atlantic seaboard. Model consensus is strong that an eventual drop to LIFR overnight will occur at several terminals overnight and continue into Saturday afternoon. .Outlook... Restrictions are likely through much of the weekend. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.