Scattered thunderstorms developed in the vicinity of a cold front. 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 in the vicinity of a cold front. 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 11, 6:03 AM EST, 3 hours 37 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 703 AM EDT Sat Aug 11 2018 .SYNOPSIS... A cold front will sag southward across the region today. An upper low will keep off and on precipitation chances in the forecast through Tuesday. Another system will approach for Wednesday into Thursday bringing additional thunderstorm chances to the region. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Multiple weather concerns in place across the region for today. First, this morning fog will be of concern north of the frontal boundary north of Interstate 70. In addition, fog will be of concern in other areas where there is any clearing, especially south central portions of the area east of Cincinnati and west of Portsmouth. Will continue to monitor trends to see if a dense fog advisory will be needed this morning. Next concern will be heavy rain potential and flash flooding concerns. A cold front will slowly sag southward today. In addition an upper level disturbance will approach the region. This will allow for several clusters of thunderstorms. Moisture transport vectors indicate some concern for flash flooding across the Tri-State and along other portions of the Ohio River area. Increased precipitation chances and added in heavy rain mention in the forecast. In addition, plan on adding flash flood threat into the HWO. A third concern for the day will be an isolated damaging wind potential primarily across southern portions of the forecast area where DCAPE values are higher during the afternoon hours. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... As the frontal boundary shifts to the south expect the more widespread precipitation to decrease. Some lighter and more isolated precipitation will still be possible tonight into Sunday associated with an upper level low. Went close to guidance for temperatures during the short term period. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Upper low over eastern Ohio at the beginning of the period will move into the Appalachians by Tuesday. Still could be some diurnal showers and thunderstorms on both Monday and Tuesday as energy rotates around this low with the better chance in central Ohio. Next short wave will move into the mid Mississippi Valley on Wednesday and track across the region Wednesday night into Thursday. Associated surface low will stay west and north of the area. However, warm front in advance of the low will lift across the area Wednesday bringing a chance of showers and thunderstorms. Trailing cold front will move into the region Thursday although it will be weakening and may not clear the area. However, the chance for precipitation will increase with this second boundary along with the upper support. Uncertainty increases for the end of the week regarding timing and amplitude of subsequent short wave. With remnant boundary potentially in the area, it seems that there will be a continued chance of showers and thunderstorms. Temperatures will be above normal until late in the week when clouds and precipitation may bring highs back closer to seasonal values although lows will remain warm. && .AVIATION /12Z SATURDAY THROUGH WEDNESDAY/... Some vsby restrictions and lower cigs will be possible at the start of the TAF period, however expect them to improve through the morning. A frontal boundary across the area in addition to a couple of upper level disturbances will keep off and on precipitation at the TAF sites through the day today. Early this morning expect this precipitation generally to be just some light shower activity. Thunderstorms will develop during the afternoon hours and remain in place into the early evening hours. Activity will decrease during the evening hours and towards the end of the TAF period. There will be some clearing and therefore there will be the potential for fog. OUTLOOK...Thunderstorms will be possible on Wednesday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Novak NEAR TERM...Novak SHORT TERM...Novak LONG TERM... AVIATION...Novak
Hazardous Weather Outlook National Weather Service Wilmington OH 509 AM EDT Sat Aug 11 2018 INZ050-OHZ042-043-051>055-060>065-073-074-120915- Wayne-Darke-Shelby-Miami-Champaign-Clark-Madison-Franklin OH-Preble- Montgomery-Greene-Fayette OH-Pickaway-Fairfield-Ross-Hocking- 509 AM EDT Sat Aug 11 2018 This Hazardous Weather Outlook is for East Central Indiana, Central Ohio, South Central Ohio and West Central Ohio. .DAY ONE...Today and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. OHZ026-034-035-044>046-056-120915- Hardin-Mercer-Auglaize-Logan-Union OH-Delaware-Licking- 509 AM EDT Sat Aug 11 2018 This Hazardous Weather Outlook is for Central Ohio and West Central Ohio. .DAY ONE...Today and Tonight. Patchy dense fog will be present across the region this morning. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. INZ058-059-066-073>075-080-KYZ089>091-094-OHZ070-071-077-082-088- 120915- Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio-Switzerland- Carroll-Gallatin-Boone-Owen-Butler-Warren-Hamilton-Pike-Scioto- 509 AM EDT Sat Aug 11 2018 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northern Kentucky, South Central Ohio and Southwest Ohio. .DAY ONE...Today and Tonight. Clusters of thunderstorms will move across the area today. Flash flooding will be possible this afternoon into the early evening hours. Isolated damaging wind gusts will also be a possibility. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. KYZ092-093-095>100-OHZ072-078>081-120915- Kenton-Campbell-Grant-Pendleton-Bracken-Robertson-Mason-Lewis- Clinton-Clermont-Brown-Highland-Adams- 509 AM EDT Sat Aug 11 2018 This Hazardous Weather Outlook is for Northeast Kentucky, Northern Kentucky, South Central Ohio and Southwest Ohio. .DAY ONE...Today and Tonight. Patchy dense fog will be present across the region this morning. Clusters of thunderstorms will move across the area today. Flash flooding will be possible this afternoon into the early evening hours. Isolated damaging wind gusts will also be a possibility. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Cincinnati radar (KILN), 92 km away, was scanning. The volume nearest the first event began at 14:41 UTC.
5 flood, 3 thunderstorm wind, 3 hail. Local standard time, as filed.
Underpasses were flooded on the south side of Columbus, with some cars stuck in the water.
High water was reported on the east bound lanes of I-70 at Wilson Road.
Water was reported up to the axle of vehicles at Frank Road and Westbrook Drive.
A tree was knocked down along Colley Road near McDermott Road.
A tree was knocked down along Duck Run Rd.
State Route 104 had six to eight inches of water over the road.
A tree was knocked down along Mill Road near Wheelersburg.
Standing water forced the closure of Cincinnati-Dayton Road near Station Road and Lesourdsville West Chester Road.
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: 764523, 764524, 764525, 766132, 766133, 764526, 764528, 766134, 767585, 764529, 764527.