Area Forecast Discussion
Issued by NWS Wilmington, OH

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000 FXUS61 KILN 252345 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 645 PM EST Sat Feb 25 2017 .SYNOPSIS... In the wake of an upper level disturbance, high pressure will build in the midwest and settle south of the Ohio Valley tonight. Zonal upper level flow and southerly surface flow will then combine to permit a moisture feed from the Gulf, and a disturbance moving with the zonal flow aloft will initiate showers over the region Sunday night and Monday. A weakly inverted trough at the surface will help move these showers northward on Monday. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
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H5 trough is currently over the CWA in a n-s orientation, and will push east and out of the Ohio Valley early this evening. Warmer air at H8 will enter from the west tonight and erode any leftover stratus or stratocu in favor of clear skies. This will permit low temperatures to reach the upper teens to around 20 in the west, low to mid 20s in the east where cloud cover will linger some.
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&& .SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/... The break in the cloud cover Sunday with seasonal temperatures will see increased cloud cover overnight with Gulf moisture streaming through and pooling over the Ohio Valley. A weak shortwave in the mean westerly flow will help wring out showers from southwest to northeast, possibly beginning overnight Sunday but likely holding off until the daytime hours Monday. Low chance pops will increase after midnight and spread from the southwest to the northeast overnight. Temperatures will only drop into the 30s with weak warm advection and southerly flow overnight. Precipitation type should be all rain. && .LONG TERM /MONDAY THROUGH SATURDAY/... An upper level disturbance will move across the region on Monday. Temperature profiles suggest that although precipitation will start out as a rain and snow mix, as warmer air works into the region precipitation will change over to all rain. After this feature moves through there will be a brief lull in the precipitation until moisture is drawn up into the region Monday night into Tuesday. Did not go quite as high as the superblend during this time due to lack of substantial forcing. Due to having less precipitation went slightly higher on temperatures for Tuesday. With a surge of warm air in advance of the next system, well above normal temperatures will continue for Wednesday. Have better precipitation chances on Wednesday into Wednesday night as a low pressure system and associated cold front approach and move through. There is some instability and therefore also have some thunder chances with this system. Temperatures will dip down into the 30s with the passage of the cold front. Increased winds with this system as model soundings are indicating some higher wind gusts. Did not go as high as some of the model outputs were suggesting, however trended away from superblend towards some higher gusts. Some residual precipitation will be possible on Thursday with cooler temperatures with trough in place. Went colder than superblend on Friday as models are consistent with cold pattern in place. An upper level disturbance is expected to work down into the region on Friday. There are some model differences in the exact placement in this feature however with cold air in place expect any precipitation to be in the form of snow. Temperatures begin to moderate for Saturday as southerly flow develops. Dry conditions are expected during this time with high pressure situated southeast of the region. && .AVIATION /00Z SUNDAY THROUGH THURSDAY/...
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Cloud deck across the region at the beginning of the period is primarily VFR, although there are still some pockets of MVFR ceilings, especially in central Ohio, which could linger for a few more hours. Otherwise, expect cloud to erode generally from west to east overnight. West winds will decrease early in the TAF period and then persist between 5 and 10 kt through the rest of the night. Winds wind will back to southerly early Sunday and strengthen slightly in the afternoon. Only expect some cirrus which may thicken up late in the period. OUTLOOK...MVFR ceilings and visibilities possible Tuesday into Wednesday and then again on Thursday. Wind gusts up to 30 kt possible Thursday.
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&& .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...Franks NEAR TERM...Franks SHORT TERM...Franks LONG TERM...Novak AVIATION... is the U.S. government's official web portal to all federal, state and local government web resources and services.