


Area Forecast Discussion
Issued by NWS Wilmington, OH
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Issued by NWS Wilmington, OH
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-- Discussion containing changed information from previous version are highlighted. --477 FXUS61 KILN 121504 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 1104 AM EDT Sat Jul 12 2025 .SYNOPSIS...-- Changed Discussion --Showers and thunderstorms are possible through Sunday, particularly in the afternoon and evening before drier conditions briefly returns for the start of the workweek. Warm temperatures drop closer to normal on Sunday and Monday, with warmer and more humid air returning by midweek. Several rounds of showers and storms will be possible midweek and beyond with a return to a more active pattern.-- End Changed Discussion --&& .NEAR TERM /UNTIL 6 PM THIS EVENING/...-- Changed Discussion --A lead mid level shortwave lifts northeast from the mid MS Valley into the Great Lakes today getting absorbed into a larger/deeper trough digging into the Great Lakes. The Ohio Valley is in a warm southwesterly flow which supports hot and humid conditions with increasing instability to support storms this afternoon. Main concern is the potential for severe storms this afternoon into this evening. Expect scattered thunderstorms to develop in the unstable airmass with SBCAPE values around 2500 J/kg within a uncapped environment. Initial convection expected to develop around midday aided by a pre-frontal trof across the western counties. With initial shortwave pivoting into the Great Lakes - better wind flow will remain north of the area. Deep-layer shear will be weak, with effective shear around 15 kts, so storm organization should be limited. DCAPE values of 1000-1200 J/kg suggest that gusty to damaging winds will be possible due to downburst/outflow with the strongest storms. This initial activity will push off to the east before another area of storms moves into the west late in the day into this evening and weaken as they track east due to loss of heating. Locally heavy rain and isolated flooding is also possible due to PWat values around 125% of seasonal normal. High temperatures look to top out around 90 degrees with surface dewpoints in the lower 70s yielding heat indices approaching 100 degrees.-- End Changed Discussion --&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... Coverage of storms should decrease late into the evening as instby wanes a bit. This being said, a few ISO SHRA/TSRA may linger into the overnight hours as the S/W works E through the region. Although the sfc front will still be back to the W quite a bit, the forcing should decrease late in the night as the midlevel S/W pivots off to the E by the predawn hours. Warm and muggy conditions will continue tonight as temps dip into the upper 60s and lower 70s by daybreak Sunday. The primary system will continue to pull away from the OH Vly into the day Sunday, with the trailing "cold" front laying out from NE to SW across the local area by Sunday afternoon. LL convergence along this feature should be quite weak as the boundary gradually begins to wash out in the region. LL flow will become largely unidirectional across the area by midday, with no substantial forcing or lifting mechanism. This being said, do expect some ISO SHRA/TSRA to develop once again, particularly near/S of I-70 and E of I-71 where the best instby will reside (ahead of the front) by mid/late afternoon. Coverage and strength of storms Sunday should be lower than will be the case today, despite the ill-defined front draped across the region. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Given current expectations that much of the thunderstorm activity will develop south and east of the I-71 corridor Sunday afternoon, confidence is high that any lingering activity likely drifts southward into central Kentucky Sunday night. Very low PoPs remain in the south for Sunday night and Monday due to some deeper moisture lingering along the stalled front. As the ridge builds over the Ohio Valley Monday night into Tuesday, a weak shortwave begins to eject from the middle Mississippi River Valley. Due to some timing differences in the resurgence of deeper moisture from the southwest, low PoPs are reintroduced area wide by Tuesday afternoon and evening. Even with the low PoPs, Tuesday is likely to be dry for much of the area. This changes significantly heading into midweek. Wednesday and Thursday are expected to be quite stormy with deep moisture arriving with the shortwave drifting into the area from the west. This moisture persists over the region Wednesday and Thursday, combining with the arrival of the trough and cold front Friday. Convective activity over several days within a broad region of 1.8- 2.2" PWATs will favor periods of flash flooding in addition to the typical summer-like downburst severe threat. The timing of the shortwave will be key to determining the window where weather impacts may be highest. For now, Wednesday and Wednesday night looks to be the primary window. Uncertainty in how quickly this wet pattern breaks down is quite high by the end of the week and into next weekend. && .AVIATION /14Z SATURDAY THROUGH WEDNESDAY/... VFR conditions will prevail area-wide through 15z. Expect a healthy VFR Cu field to sprout by/after 15z, with SCT to numerous SHRA/TSRA development shortly thereafter. The greatest coverage should initially be focused across the W/SW half of the local area, especially for KDAY/KCVG/KLUK/KILN, by 18z before clusters of SHRA/TSRA shift off to the E toward KCMH/KLCK by 20z or so. Additional activity is expected to move in toward/beyond 00z from the W before waning late in the period with eastward extent. Abrupt changes in VSBYs and wind speed/direction will be possible with any of the SHRA/TSRA activity and will be handled with amendments as needed. Some MVFR CIGs are expected to overspread the area past 06z through daybreak Sunday before lifting/scattering once again by 15z. Some MVFR VSBYs cannot be ruled out tonight, but the expanding MVFR stratus should inhibit widespread FG development. Light SW winds at 5kts or less early this morning will increase to 10-15kts, with gusts close to 20kts possible, by this afternoon. Winds will decrease following the storm activity, but should gradually become more out of the WSW by daybreak Sunday. OUTLOOK...Thunderstorms are possible Sunday and again on Wednesday, with the greatest chance during the afternoon and evening on both days. MVFR conditions are possible into early Sunday morning. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && $$ SYNOPSIS...KC/AR NEAR TERM...AR SHORT TERM...KC LONG TERM...McGinnis AVIATION...KC