Area Forecast Discussion
Issued by NWS Wilmington, OH

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000 FXUS61 KILN 222017 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 417 PM EDT Wed Mar 22 2017 .SYNOPSIS...
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High pressure over the Great Lakes will move southeast into the mid Atlantic states tonight. Southerly winds on the back side of the high will bring a warming trend for the rest of the week. A large low pressure system will move into the area over the weekend.
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&& .NEAR TERM /THROUGH TONIGHT/...
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High pressure centered to the north of the area will move southeast tonight. Northwest upper flow will bring some cirrus into the southwest half of the forecast area overnight. Do not expect this to have much if any impact on temperatures. Lows will be well below normal with the coldest readings in central Ohio where there will be the least wind and fewest clouds. A freeze warning will remain in effect along and south of the Ohio River where the growing season started abnormally early.
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&& .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
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Low level flow will veer around to the southeast Thursday. A weak warm front will lift north late Thursday into Thursday evening which will bring winds around to the south with wind speeds slowly increasing later Thursday night. 12Z model suite suggests that a few showers could occur near the warm front across the northern counties. Further south, low levels will likely be too dry. Low chance PoPs seems sufficient. Temperature forecast is on the cooler side of guidance. Expect lows Thursday night to be in the evening with rising temperatures later in the night.
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&& .LONG TERM /SATURDAY THROUGH WEDNESDAY/...
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Friday continues a strong warm push with the warm front lifted north of area by Friday morning with the forecast area firmly in the warm sector as the upper low cuts off and slowly progresses through the central plains toward the area. With the tightening gradient between the upper ridge off the SE coast and the strenghtening low, aabove normal temperatures for Friday with a strong inversion over the region, but with good mixing allowing for wind gusts up to 25 or even 30kts. As the low winds its way into the western Ohio Valley, there are some differences between the NAM/GFS/GFS Ensemble solution and the ECMWF with most models creating a stacked and slow moving upper low, whereas the ECMWF shows a more progressive and northerly solution with the low, and brings in precipitation sooner than other models. Have leaned more toward the NAM/GFS/Blended solutions but sped up timing slightly allowing for the potential for an earlier precipitation onset. while instability not tremendous with this system, continued with mention of thunder, along with efficient moisture transport bringing the potential for locally heavy rain especially Saturday night into early Sunday. The additional concern is a continued GFS trend in increasing low level wind shear as the stacked low approaches the region by 12z Sunday. Will have to continue to monitor for potential severe threat Saturday night into early Sunday. As the low finally becomes more muted a more zonal pattern dominates the region for Monday through Wednesday. After a brief and weak area of high pressure transitions through the region from Sunday night into early Monday, it will be followed by a progressively moving shortwave to bring another round of precipitation late Monday into the early Tuesday afternoon. Weak high pressure begins to build in from the west, with the region under NW flow aloft for Wednesday with some lingering showers. Dry conditions for Wednesday night as the weak high builds in.
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&& .AVIATION /19Z WEDNESDAY THROUGH MONDAY/... VFR conditions will prevail. The few to scattered stratocumulus across the region will dissipate before 00Z. Otherwise will only see some cirrus spreading into the region during the latter part of the period. Northeast winds will diminish to less than 10 kt and then slowly veer tonight into Thursday. OUTLOOK...MVFR ceilings and visibilities likely Saturday night into Sunday along with a chance of thunderstorms. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...Freeze Warning from 11 PM this evening to 10 AM EDT Thursday for OHZ077>079-081-088. KY...Freeze Warning from 11 PM this evening to 10 AM EDT Thursday for KYZ089>100. IN...Freeze Warning from 11 PM this evening to 10 AM EDT Thursday for INZ073>075-080. && $$ SYNOPSIS... NEAR TERM... SHORT TERM... LONG TERM...JDR AVIATION...

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