Scattered thunderstorms developed ahead of a cold front which was dropping south through the region. The thunderstorms produced heavy rain, which produced some flooding.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ILN wrote it up.
Scattered thunderstorms developed ahead of a cold front which was dropping south through the region. The thunderstorms produced heavy rain, which produced some flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Wilmington, OH wrote its last area forecast discussion before the first event at Aug 10, 2:51 PM EST, 7 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 351 PM EDT Fri Aug 10 2018 .SYNOPSIS... A cold front located along the I-70 corridor this afternoon will move slowly south tonight and weaken as it stalls north of the Ohio River. Thunderstorm activity will be found over the region as the weakening surface front interacts with an upper level trough through at least Saturday. The front will push south on Sunday as the upper trough develops into a closed circulation drifting southwest over Ohio. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... Thunderstorm activity will be on the increase this evening and scatter out through the overnight hours. Storms will be lingering however, so some activity will occur through the night, most likely north of the Ohio River but not necessarily limited to this area. As the surface front washes out as it stalls before hitting the Ohio River, temperatures tonight will drop to the middle 60s across the region under generally cloudy skies. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/... Lingering showers in the morning will continue their downward trend but then ramp back up as daytime heating interacts with the lingering surface front to the south and any shortwave energy that will remain within the deepening upper level trough. As the front moves into Kentucky later in the day Saturday, the axis of the upper trough will be bringing in more shortwave energy. However, the atmosphere should have been well worked- over so that any lingering convection Saturday night should be isolated in nature and not contain much thunder. That being said, I did not remove thunder from forecast and change to just showery precip. Will let future model runs solidify this expectation in the forecast. Saturday will see highs a little cooler - lower 80s in most locations. Rainfall may necessitate shaving a few more degrees from this forecast with future updates. Drier air will be making a strong push on Saturday night over the northwestern 1/2 of forecast area. Am slightly concerned about the proximity of a cutoff upper low and going clear to partly cloudy, but the flow should put any upper clouds away from the CWA. Overnight lows will drop to 60-63 degrees by Sunday morning for most of the CWA as dewpoints drop nicely below 60 degrees for the first time in a while. && .LONG TERM /SUNDAY THROUGH FRIDAY/... On Sunday, an upper level ridge will continue to amplify as it pushes northeast into the upper Mississippi River Valley and into Ontario. As this occurs, a closed upper level low will develop downstream over the Great Lakes. It appears that the better low level forcing will remain east of the region on Sunday. Thus, only a low chance of showers/thunderstorms are expected with the upper low. Highs will be mainly in the lower 80s. For Sunday night, pcpn will be diurnally driven over our area but will likely persist just to our east. Lows will drop into the lower 60s. Models have come in better agreement in regards to the location and eventual movement of the upper level closed low Monday through Tuesday. On Monday, the center of the upper level closed low will be over the middle Ohio Valley. Again, low level forcing and upper support favor the eastern zones, while our western zones should remain dry. Thus, a chance of showers and thunderstorms will remain across the east. For Monday night into Tuesday, the low will begin to slowly nudge east. There could be a lingering low chance of shower/storms in the east on Tuesday, while the west remains dry. Highs will range from the lower to mid 80s with lows in the lower to mid 60s. As the low opens up and moves further east, short wave ridging will briefly translate across the region Tuesday night. A short wave will be lifting out of the central Plains and into the Ohio Valley Wednesday/Wednesday night followed by a northern stream short wave dropping into the Great Lakes on Thursday. These features will bring unsettled conditions. At this time, it appears that the most active period will be Wednesday night into Thursday with showers and thunderstorms. Models are in disarray by the end of next week in regards if energy will close off over the region. Have kept low PoPs for now. Highs will remain in the lower to mid 80s with lows in the 60s. && .AVIATION /20Z FRIDAY THROUGH WEDNESDAY/... Convection firing along and north of the I-70 corridor will affect CMH/LCK early on this afternoon, then spread southward. Did not feel that CVG/LUK would definitely get this activity tonight, so left thunderstorms out at this moment in time in favor of amending if future model runs can come together with a more cohesive solution, or if upstream development would warrant inclusion later this evening. Cigs/vsbys will be lowered in any TS activity today and tonight, and lower clouds will likely make an appearance overnight and early tomorrow given the expected low level injection of moisture from any storms that are present and stalled surface cold front. Showers and some lingering thunderstorms will continue overnight given the proximity of the upper trough and associated vorticity maxima within it, combined with the washed-out surface front that will lay out just north of the Ohio River late tonight and early Saturday. More showers and some thunderstorms will occur tomorrow with an increase in coverage and intensity due to daytime heating. OUTLOOK...Thunderstorms will remain possible at times through Sunday, with the greatest chances during the afternoon and evening. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Franks NEAR TERM...Franks SHORT TERM...Franks LONG TERM...Hickman AVIATION...Franks
Hazardous Weather Outlook National Weather Service Wilmington OH 246 AM EDT Fri Aug 10 2018 INZ073>075-080-KYZ089>100-OHZ077>082-088-110700- Ripley-Dearborn-Ohio-Switzerland-Carroll-Gallatin-Boone-Kenton- Campbell-Owen-Grant-Pendleton-Bracken-Robertson-Mason-Lewis-Hamilton- Clermont-Brown-Highland-Adams-Pike-Scioto- 246 AM EDT Fri Aug 10 2018 This Hazardous Weather Outlook is for Southeast Indiana, Northeast Kentucky, Northern Kentucky, South Central Ohio and Southwest Ohio. .DAY ONE...Today and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. INZ050-058-059-066-OHZ026-034-035-042>046-051>056-060>065-070>074- 110700- Wayne-Fayette IN-Union IN-Franklin IN-Hardin-Mercer-Auglaize-Darke- Shelby-Logan-Union OH-Delaware-Miami-Champaign-Clark-Madison- Franklin OH-Licking-Preble-Montgomery-Greene-Fayette OH-Pickaway- Fairfield-Butler-Warren-Clinton-Ross-Hocking- 246 AM EDT Fri Aug 10 2018 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Central Ohio, South Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Today and Tonight. Clusters of thunderstorms will move across the area this afternoon into tonight. Isolated damaging wind gusts will be possible. In addition, flash flooding will also be possible. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Cincinnati radar (KILN), 116 km away, was scanning. The volume nearest the first event began at 19:57 UTC.
6 thunderstorm wind, 5 flood. Local standard time, as filed.
One tree was knocked down.
A street sign was bent down on OH-158, a quarter of a mile south of OH-256 in Baltimore.
One tree was knocked down.
A large tree branch was knocked down and caused minor injuries to an individual in a canoe.
An area of corn a couple of miles long was flattened.
A barn was destroyed.
High water was reported on State Routes 138 and 104.
Standing water at least ankle deep was reported.
Some high water was reported on a few streets.
East Berryville Road was washed out just east of State Route 73.
High water was reported on U.S. 50 near the Highland/Brown County Line. The water was high enough to make it almost impassible for an SUV.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2018Every state in 2018This day in weather historyWarnings in Ohio, August 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 764519, 764522, 764520, 764521, 767591, 767592, 764514, 764515, 764516, 764517, 764518.