Area Forecast Discussion
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000 FXUS61 KPBZ 211540 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 1040 AM EST Sat Jan 21 2017 .SYNOPSIS... Mild weather will continue through the weekend. Widespread rain is expected to move back into the region Sunday afternoon. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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The late morning featured adjustments to cloud cover and an upward temperature tweak. High pressure, marred only by residual morning and increasing high cloudiness, will maintain dry and warm conditions today. Highs 25 to 30 degrees above the averages are expected.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/... Operational models are coming into better agreement on the overall pattern during the short term. Upper level energy will cutoff over the Texas panhandle this evening and move eastward tonight, reaching TN/AL by Sunday evening. A powerful jet will swing around the 500mb low and drive northward toward the Mid-Atlantic region. This will pump copious amounts of moisture northward through the Mid-Atlantic and into the Ohio Valley on Sunday/Sunday night. In addition to the moisture, waves of energy, revolving around the upper low, will also move northward Sunday afternoon. At the surface, low pressure will rapidly develop beneath the upper low tonight and move quickly eastward on Sunday with the strong upper level support. Seeing some differences between the NAM/GFS on the surface low placement Sunday afternoon, so will lean toward the GFS, as it is showing better agreement with both the GEFS and EPS. Showers will quickly overspread the area Sunday afternoon and continue through Monday. The upper level low will become negatively tilted on Monday and slow down, as it battles the responding ridge that will stretch from the Atlantic Ocean northward over Northern New England. With the placement of the upper low and the strong jet on its eastern flank, the heaviest rain would likely move through our region late Sunday night and Monday morning. After this time, the jet axis will take aim at Eastern Pennsylvania, shifting the highest qpf into the areas. With the absence of arctic air, all of the precipitation on Monday will remain in the liquid form. Temperatures Sunday and Monday will again be above normal, but Monday will be noticeably cooler. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... On Monday night, operational models begin to move away from the ensemble data, and even the ensemble data is not agreeing on what the lows track will be on Tuesday. Still expect showers on Tuesday, but depending on what the surface low actually does, snow flakes may mix as colder air wraps around the exiting system. Additionally, the ending of the precipitation is not set in stone due to the aforementioned model differences. Warmer air will quickly move back into the area on Wednesday as southwest flow will ensue ahead of the next system, which will move from the Upper Midwest to the Great Lakes late Tuesday night and Wednesday. This midweek system will bring scattered showers back into the area. By the end of the long term, a return to more normal January air is expected with snow showers possible. && .AVIATION /16Z SATURDAY THROUGH WEDNESDAY/...
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Residual fog and stratus will lift by mid day with VFR dominating until rain develops on Sunday. .OUTLOOK... More restrictions are likely Sunday into Monday with slow moving low pressure.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$ 15

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