Isolated thunderstorms developed during the afternoon hours in an unstable air mass in place across the region.
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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.
Isolated thunderstorms developed during the afternoon hours in an unstable air mass in place across the region.
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 May 27, 2:49 PM EST, 2 hours 36 minutes earlier.
Area Forecast Discussion...CORRECTED National Weather Service Wilmington OH 349 PM EDT Sun May 27 2018 .SYNOPSIS... An upper level ridge will bring warm and humid conditions for tonight and Memorial Day. The remains of tropical system Alberto will affect the region by the middle of the week. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... Scattered convection in nrn KY and south central Ohio should continue for the late afternoon, before dissipating with sunset. During the overnight hours, the H5 ridge builds an extension eastward into the Ohio Valley. Some high level moisture from Alberto will try and spread north, but the region will be dry. Moist low levels will combine with light winds to set up fog again tonight. Low temperatures tonight will drop into the mid 60s. && .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... Alberto is forecast to make landfall early Monday morning, but the region will be under the upper ridge. Models are indicating the high clouds from Alberto will continue to lift north. Models continue to show some convection popping up in northern KY, so kept the 20 PoPs going there. Also the models are showing some possible pcpn development north of the fa, possibly along the lake breeze from Lake Erie. It looks like this would stay to the north. Widespread lower 90s can be expected for highs Monday with heat index values in the lower 90s. Alberto will continue to drift north Monday night, but pcpn will remain well south of the region. Monday night will be another muggy one, as lows only drop into the upper 60s. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Dry conditions will start out the long term Tuesday morning, however dry conditions will be short lived as moisture from the remnants of Alberto begin to work up into the region. There will be two areas of precipitation across the region Tuesday afternoon. With greater instability across the north thunderstorms will be possible in this area. In addition, across the south precipitation will work into that region as the moisture from the remnants of Alberto push northward. The most widespread precipitation is expected on Wednesday with the remnants centered over Indiana. This will keep temperatures down with high temperatures only expected to be in the low 80s. Breezy conditions will also be present on Wednesday with some wind gusts around 25 to 30 mph possible. On Thursday and Friday a couple of disturbances will work through the region bringing additional precipitation chances to the region. Cooler and drier conditions will be present for the weekend. && .AVIATION /19Z SUNDAY THROUGH FRIDAY/... A 500 mb ridge will be building northeast over the region today. However a weak area of PVA caught in the flow over in srn OH/nrn KY is combining with surface instability to kick off scattered convection south and southeast of the tafs. Expect this activity not to affect the tafs, so left them all dry. Overnight, winds will go very light and some scattered cirrus will be affecting the region. However, low levels will remain very moisture with dewpoints in the mid 60s again tonight. This should allow for fog development again. Have MVFR fog at all locations, dropping down to IFR at LUK and ILN by sunrise. Fog will burn off Monday morning, leaving VFR conditions. Subtropical Storm Alberto will be making landfall in the Gulf and will be throwing a cirrus deck up over the tafs, but the tafs will be dry. OUTLOOK...Thunderstorms are possible Wednesday into Friday. MVFR ceilings and visibilities possible Wednesday night into Thursday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Haines/Sites NEAR TERM...Sites SHORT TERM...Sites LONG TERM... AVIATION...Sites
Hazardous Weather Outlook National Weather Service Wilmington OH 835 AM EDT Sun May 27 2018 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-281245- 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- 835 AM EDT Sun May 27 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...Today and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Cincinnati radar (KILN), 35 km away, was scanning. The volume nearest the first event began at 22:23 UTC.
1 thunderstorm wind. Local standard time, as filed.
A tree was downed onto Carper Lane. Power poles and power lines were downed onto Petersburg 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, May 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: 747019.