Severe thunderstorms, some which produced large hail, developed ahead of an upper level disturbance.
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.
Severe thunderstorms, some which produced large hail, developed ahead of an upper level disturbance.
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 25, 5:16 AM EST, 2 hours 26 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 616 AM EDT Sat Aug 25 2018 .SYNOPSIS... Warmer air will begin to move into the region today, with chances for showers and thunderstorms beginning to increase. As a ridge of high pressure sets up over the southeastern states, temperatures will reach values well above normal on Sunday and into next week, with occasional chances for thunderstorms continuing as well. && .NEAR TERM /THROUGH TONIGHT/... The first signs of upstream convective development are showing up over over northern Illinois as of 230AM. This activity is developing in advance of a dampening mid-level trough, which will nonetheless be progressing eastward through the southern Great Lakes and northern Ohio Valley this morning. A weak area of surface low pressure is currently centered over southern Minnesota, with a surface warm front still upstream (southwest) of the ILN CWA. However, some warm advection (if not particularly moist) is already occurring, and stronger warm advection is occurring aloft (noting a sharp SSW-to-NNE theta-e gradient now entering the forecast area at 850mb on several model projections). This has allowed for a thickening of clouds in the 5kft-10kft range, along with some light echoes that are at least intermittently reaching the ground. No expectation for more than a few light showers out of this activity. Attention will then turn to the convection upstream. While the 00Z KILN sounding recorded a precipitable water value of just 1.03", a developing low-level jet will feed into Indiana and western Ohio through the morning hours, increasing that value to above an inch and a half. The moisture convergence will line up with the weak upper ascent to allow for showers and thunderstorms to grow over northern Indiana, thanks also in part to some elevated instability. Several clusters of storms will move into the ILN CWA during the 10Z-12Z time frame, moving southeast and quickly outrunning the source forcing. Thus, a weakening trend is expected after a few hours, with little projection for any appreciable surface-based instability to develop ahead of the storms. This will keep the severe threat very low, but PoPs are going to need to continue to be increased once the activity gets developing and timing can be locked down. The uncertainty with this forecast is exactly when the storms will dissipate -- and if any instability can develop ahead of them, perhaps lengthening their lifespan into the afternoon and into the southwestern sections of the ILN forecast area. What does look fairly certain is that forcing all but dissipates over most of the area by afternoon, leading to a reduction in PoPs during what would normally be the diurnal max. Temperatures are gradually rising as of this writing, and will continue to rise through the rest of the morning. The max temp forecast is complicated a little bit by the storms, but an upper 70s NW / lower 80s SE solution still looks like a good call. && .SHORT TERM /SUNDAY/... During the time frame from tonight into Sunday, the overall flow over the ILN CWA will become much more zonal. Mid-level ridging will be developing more strongly over the southeastern states, and there will even be somewhat of a reflection of an axis of surface high pressure extending northward into the Great Lakes. This does not change the fact that the overall pattern is still one that will be somewhat active for the region as a whole, and there may be one shot at some additional convective redevelopment this evening into the overnight hours -- a shortwave moving quickly through this west-to-east flow. Model agreement in getting some development is pretty strong, but timing/placement/magnitude are bigger question marks. Looking at the thermodynamic situation, this activity may also be primarily elevated. On Sunday, conditions look very summer-like -- notable heat (highs in the upper 80s) with copious instability (several thousand J/kg SBCAPE) and weak flow with no signs of forcing. Would hate to run a completely dry forecast with that much instability and no strong cap, so 20 PoPs will be maintained for Sunday afternoon. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... A subtropical mid level ridge will continue to build northeast into the Ohio Valley Sunday night into Monday. This will allow heat and humidity to build across the region. The air mass will be weakly capped on Monday. Thus, the chances for a pop up shower or storm will be low (10 percent). After lows in the lower 70s, highs will warm into the upper 80s to the lower 90s. With dewpoints mainly in the lower 70s, heat indicies will range from the upper 90s to around 100. Will continue to mention the heat and humidity in the HWO product. For Monday night into Tuesday, models concur that the center of the subtropical mid level ridge will track toward the mid Atlantic region. In this pattern, heat and humidity are forecast. Again, the air mass will be weakly capped, so low chances for a pop up shower/storm. Highs Tuesday will likely be the warmest of the week, lower 90s for most locations. With dewpoints mainly in the lower 70s, heat indices will be near 100. Will mention this threat in the HWO. The consensus model solution is to allow the subtropical ridge to become suppressed to the south Tuesday night into Wednesday night. This will allow short wave energy to move across the Great Lakes as mid level westerlies become more pronounced. This will also bring a cold front southeast into our region. Timing continues to vary with the latest ECMWF the slowest. Overall, clouds should increase as well as the threat for showers and thunderstorms, poised to be the highest in the Wednesday/Wednesday night time frame. By Thursday, the front will lay out parallel to the westerly flow aloft. This will prevent its fast exit out of the region. Thus, will hold on to a chance of showers/storms across the southern zones on Thursday. The front may move far enough to the south by Thursday night/Friday to bring dry weather back to the entire region. As for temperatures, they will show a downward trend into the upper 70s to the lower by Thursday/Friday, along with lower humidity. && .AVIATION /10Z SATURDAY THROUGH WEDNESDAY/... Clouds are continuing to thicken and lower at the airports, though conditions are still VFR, and prevailing VFR conditions are likely through the entire TAF period. The problems will come from thunderstorm potential, as a large area of storms has developed over Indiana. These storms are forecast to move southeast toward the ILN airports in the 14Z-18Z time frame. These storms will weaken as the morning progresses, but it does look like they will impact KDAY for sure. The storms may be falling apart before reaching the other TAF sites, but some impacts will be possible -- a VCSH will be maintained elsewhere. However, VCTS will be used at KDAY. Severe weather and gusty winds do not appear particularly likely, but some brief MVFR (maybe IFR) conditions will be possible. Outside of the storms, SSW wind gusts of up to 20-25 knots will be possible during the afternoon. Chances for rain will diminish as the day progresses, and while some precipitation could occur during the afternoon and into the overnight hours, this remains a part of the forecast that is somewhat unclear as of now. A VCSH will be maintained for a while, before going dry for the overnight period. OUTLOOK...Thunderstorms are possible on Wednesday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Hatzos NEAR TERM...Hatzos SHORT TERM...Hatzos LONG TERM...Hickman AVIATION...Hatzos
Hazardous Weather Outlook National Weather Service Wilmington OH 340 AM EDT Sat Aug 25 2018 INZ050-058-059-066-073>075-080-KYZ089>096-OHZ034-035-042-043-051-060- 061-070-071-077-078-261200- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant- Pendleton-Mercer-Auglaize-Darke-Shelby-Miami-Preble-Montgomery- Butler-Warren-Hamilton-Clermont- 340 AM EDT Sat Aug 25 2018 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northern Kentucky, Southwest Ohio and West Central Ohio. .DAY ONE...Today and Tonight. There is a low probability for widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Heat and humidity will return for the beginning of next week. Heat indicies are forecast to range from the mid to upper 90s Sunday, with upper 90s to near 100 expected for Monday and Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. KYZ097>100-OHZ026-044>046-052>056-062>065-072>074-079>082-088-261200- Bracken-Robertson-Mason-Lewis-Hardin-Logan-Union OH-Delaware- Champaign-Clark-Madison-Franklin OH-Licking-Greene-Fayette OH- Pickaway-Fairfield-Clinton-Ross-Hocking-Brown-Highland-Adams-Pike- Scioto- 340 AM EDT Sat Aug 25 2018 This Hazardous Weather Outlook is for Northeast Kentucky, Northern Kentucky, Central Ohio, South Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Today and Tonight. There is a low probability for widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Heat and humidity will return for the beginning of next week. Heat indicies are forecast to range from the upper 90s to near 100 Monday and Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Cincinnati radar (KILN), 104 km away, was scanning. The volume nearest the first event began at 12:42 UTC.
8 thunderstorm wind, 1 hail. Local standard time, as filed.
A tree was knocked down.
There were multiple reports of baseball sized hail around Batesville.
A tree was knocked down.
Multiple trees were knocked down over a road. The largest was 2 feet in diameter.
A tree was knocked down.
A tree was knocked down.
A tree was knocked down.
A tree was knocked down.
A tree was knocked down.
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: 769151, 769150, 769152, 769153, 769154, 769155, 769156, 769157, 769158.