Area Forecast Discussion
Issued by NWS Wilmington, OH
Issued by NWS Wilmington, OH
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473 FXUS61 KILN 122323 AFDILN AREA FORECAST DISCUSSION National Weather Service Wilmington OH 723 PM EDT Sun May 12 2024 .SYNOPSIS... High pressure will move off to the east tonight and Monday. Low pressure will move out of the Ozarks and track east across the Ohio Valley Monday night through Wednesday, resulting in unsettled conditions across the region. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... For tonight, a surface high pressure ridge will continue to move east. A southerly flow pattern can be expected at the surface between the departing high and a frontal system sagging southeast into the western Great Lakes. Just some scattered high clouds are expected. It will be warmer, especially across the northwest where winds will be the highest. Lows will range from the upper 40s far east to the upper 50s far northwest. && .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... For the first part of Monday, a mid level ridge axis will traverse east across the Ohio Valley. Once this axis goes by, there will be an increase in mid and high level clouds, mixed with some diurnal cumulus clouds. Southerly flow will increase, becoming locally gusty (20 to 25 mph) in the afternoon. By late in the day, deeper moisture will increase from the southwest ahead of the next weather system. This may bring a low chance of a shower late in the day, mainly west of the I-75 corridor. It will continue to warm from the previous day with highs ranging from 75 to 80. By Monday night, a lead s/wv ejecting ahead of a mid level trough over the middle Mississippi River Valley will bring moisture and lift. This feature, coupled with a modest low level jet, will result in numerous showers as they pivot southwest to northeast overnight. There will be enough instability for a few embedded thunderstorms. Clouds and higher humidity will keep overnight lows warm, mostly in the 60s. && .LONG TERM /TUESDAY THROUGH SUNDAY/... On Tuesday morning, an upper low over the middle Mississippi Valley region will be opening up into a wave, moving very slowly eastward into the Ohio Valley. Flow into the ILN CWA will generally be southerly at the surface, switching to southwesterly through the 850mb-700mb layer. This pattern will support general ascent over the region, with enough moisture and destabilization to provide a chance for showers and thunderstorms. There may be a diurnal minimum at the beginning of the day, with additional showers and storms developing by afternoon and evening. Broader forcing in the southern sections of the forecast area will exist, as well as some more focused forcing ahead of a cold front moving southward into northern Indiana and Ohio. By Tuesday night, a surface low associated with this entire system will be weakening as it tracks east into the area. Would not be surprised to see some slow storm motions and localized heavy rain. However, the overall instability and wind shear projections are not looking especially favorable for severe weather. By Wednesday morning, the surface low will be washing out, but the upper trough will still be lumbering its way to the east. This will keep a chance of some additional showers in the forecast -- and possibly a thunderstorm, with some cooler air moving in aloft providing some steeper lapse rates. Once the trough axis has departed the area, dry conditions are expected late Wednesday into Wednesday night. Ridging and surface high pressure will bring drier conditions on Thursday. Confidence is low in the pattern for Friday and Saturday, as there remains model disagreement in how quickly southerly flow and upstream troughing will return to the area. There are also differences in just how amplified the pattern will get heading into next weekend. Friday is looking a little more likely to have rain in the area, with lower confidence in timing for the next system or two beyond that. With the trough still in the area, temperatures on Tuesday and Wednesday will be in the lower 70s for highs. A warming trend is expected beyond that, with values reaching the upper 70s to lower 80s by Sunday. && .AVIATION /00Z MONDAY THROUGH FRIDAY/... A few lingering VFR Cu should dissipate toward/beyond sunset, leaving just some cirrus for the overnight period. Southerly winds will stay generally 5kts or less through daybreak, with some light/VRB/calm conditions at KLUK leading to the potential for some river valley BR and VSBY reductions once again, mainly between 08z-12z. After any river valley BR clears up, some VFR Cu should pop once again toward the afternoon, with some SCT/BKN cirrus overhead. SW winds will increase to 10-12kts, with gusts to around 20kts likely, past 16z through peak diurnal mixing. Thickening cloud cover and SHRA will approach from the SW toward 00z and beyond, impacting mainly the KCVG 30-hr TAF for now. CIGs will trend MVFR from SW to NE toward/beyond 06z Tuesday with increasing coverage of SHRA and embedded TSRA area-wide. OUTLOOK...MVFR ceilings and visibilities are likely Monday night into Wednesday, with a period of IFR ceilings and visibilities possible. Thunderstorms will also be possible Monday night into Tuesday night. MVFR ceilings and visibilities possible Friday. Thunderstorms are also possible Friday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...Hickman NEAR TERM...Hickman SHORT TERM...Hickman LONG TERM...Hatzos AVIATION...KC