Area Forecast Discussion
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000 FXUS61 KPBZ 161312 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 812 AM EST Mon Jan 16 2017 .SYNOPSIS... A warm front will bring warmer temperatures today, with increasing rain chances tonight and Tuesday. && .NEAR TERM /THROUGH TONIGHT/...
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Clouds will be on the increase today ahead of a warm front approaching from the southwest. Latest model guidance suggests widely scattered showers may develop starting as early as mid- afternoon, however, most locations are not likely to see rain develop until later tonight as the warm front begins to cross the forecast area. Temperatures will warm well into the 40s south, and reach near 40 north by evening. Not much of a diurnal drop in temperatures expected overnight with increasing deep moisture in warm advection. Temperatures will fall a bit mainly due to wet bulbing, as rain becomes widespread across the region overnight with an approaching shortwave.
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&& .SHORT TERM /TUESDAY THROUGH WEDNESDAY/... Rain will continue Tuesday as a surface low tracks northeast over the Great Lakes, with very mild temperatures ahead of the system. The parent upper trough will cross the region Wednesday with showers ending and slightly cooler temperatures. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... Eastern CONUS ridge will give dry and mild conditions Thursday. Deterministic models differ on strong shortwave moving toward the Ohio valley for Friday, as well as a deepening full latitude mid level trough moving east toward the weekend. A modified model blend was used from Friday onward to smooth POPs and temperatures and for surrounding office coordination. && .AVIATION /13Z MONDAY THROUGH FRIDAY/... VFR conditions should gradually deteriorate to MVFR through the day from S-N in warm, moist advection ahead of an approaching warm front. Further deterioration to IFR is expected by this evening as rain overspreads the area. .OUTLOOK... Restrictions are likely through Wednesday with crossing low pressure. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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