Numerous rounds of thunderstorms produced heavy rain and isolated flooding.
Every event with a place to put it. Tap one for its entry below.
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.
Numerous rounds of thunderstorms produced heavy rain and isolated 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 16, 9:04 PM EST, 1 hour 56 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 1004 PM EDT Thu Aug 16 2018 .SYNOPSIS... A series of upper level disturbances will combine with a slow moving frontal boundary to result in a chance of showers and a few thunderstorms through the first half of the weekend. Weak high pressure and drier conditions will briefly build into the region for Sunday. However, the chance for showers and thunderstorms will return Monday into Tuesday as a low pressure moves into the Great Lakes region. && .NEAR TERM /THROUGH FRIDAY/... Some mid level short wave energy will work east toward our area later tonight as a weak boundary continues to sag slowly southeast across the region. This will combine with another, weaker low level jet shifting east across the mid Ohio Valley to keep a chance of showers and a few thunderstorms going overnight, aided by persistent instability residing over Indiana. As CVG approaches its daily rainfall record for any day in August, minor high water issues will still be possible, though scattered nature of convection will work against this. && .SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY/... The boundary will continue to push very slowly southeast through the day on Friday as short wave energy works east across the region. This will lead to a continued chance of showers and thunderstorms through the day on Friday. Along and southeast of the boundary, PWs will still remain on the high side so heavy rain/localized flooding will remain possible on Friday, especially across southern portions of our area. Highs on Friday will be in the upper 70s to lower 80s. A chance of showers and possibly a few thunderstorms will persist Friday night into Saturday as the boundary pushes very slowly to our southeast. Will range pops on Saturday from slight chance across the far northwest to likely in the southeast. Highs on Saturday will be in the lower 80s. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... The boundary will finally push south of the area on Sunday, although it will still be close enough to keep a slight chance of showers or thunderstorms going across our far southwest, primarily in the afternoon as we get some daytime heating. Otherwise, expect dry conditions across the area with highs on Sunday in the low to mid 80s. Short wave energy moving through the northern Plains will help an upper level trough build down into the Ohio Valley through mid week. As it does, as associated surface low will lift northeast across the Great Lakes on Tuesday. Ahead of this, the boundary to our south will lift back to the north as a warm front on Monday, followed by a trailing cold front on Tuesday. This will lead to an increasing chance of showers and thunderstorms Monday into Monday night. These will likely continue into Tuesday morning before tapering off from the west Tuesday afternoon. A secondary trough axis will push across the region on Wednesday, leading to a lingering chance of showers and thunderstorms. Ridging and a drier airmass should then build into the area for Thursday. && .AVIATION /02Z FRIDAY THROUGH TUESDAY/... TAF sites continue to be affected by a moist southwest flow ahead of low pressure advancing to the Great Lakes. Though strongest moisture transport is exiting with the low level jet max, there is enough residual moisture and lift to produce a few more showers and thunderstorms early tonight. As convection dies off overnight, ceilings and visibilities as low as IFR are expected. Conditions will be slow to improve on Friday, even as thunderstorms redevelop during afternoon heating. OUTLOOK...Thunderstorms possible Saturday and again Monday into Tuesday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...JGL NEAR TERM...Coniglio/JGL SHORT TERM...JGL LONG TERM...Binau/JGL AVIATION...Coniglio
Hazardous Weather Outlook National Weather Service Wilmington OH 1149 PM EDT Thu Aug 16 2018 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-180400- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant- Pendleton-Bracken-Robertson-Mason-Lewis-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-Hamilton-Clermont-Brown- Highland-Adams-Pike-Scioto- 1149 PM EDT Thu Aug 16 2018 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northeast Kentucky, Northern Kentucky, Central Ohio, South Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Tonight. Scattered showers and storms overnight will have the potential to produce torrential rainfall rates and localized flooding, particularly in urban areas and along small creeks and streams. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A few strong to severe thunderstorms are possible on Friday afternoon and evening with the primary threat being isolated damaging wind gusts. Locally heavy rainfall in areas which have seen significant rain recently may cause some brief flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Water was reported over portions of Route 56 between Aurora and Rising Sun.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2018Every state in 2018This day in weather historyWarnings in Indiana, 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: 766137.