A weakening Mesoscale Convective System (MCS) brought strong to severe storms to the region.
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.
A weakening Mesoscale Convective System (MCS) brought strong to severe storms to 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 Aug 18, 1:01 AM EST, 32 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 201 AM EDT Sun Aug 18 2019 .SYNOPSIS... Weak disturbances moving across the region will bring several chances of thunderstorms for the early part of the week. A better chance of storms will come as a cold front pushes through the area late Wednesday. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... Dry conditions are in place across our area this evening. An area of thunderstorms has developed in the past couple of hours back across southern Illinois. This is in an area of better ML capes and along the nose of a developing 925 mb low level jet. This low level jet is forecast to strengthen somewhat as it shifts northeast across central Indiana into northwest Ohio through the overnight hours. ML capes across that region are less unstable due to the convection and remnant clouds cover from earlier in the day, although there is are still some more decent elevated instability present. The overall trend of the HRRR and the RAP has been to allow for some additional development eastward into Indiana over the next few hours before weakening it some as it pushes northeast across mainly northwest portions of our area later tonight. Will trend the forecast this way and allow for a period of lower chance pops across about the northwest half of our fa through the early morning hours overnight. && .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM MONDAY/... A weak boundary across the lower Great Lakes combined with a mid level impulse will bring another chance of storms, mainly in the afternoon and evening to northern counties. Cloud cover may be a bit more in the north as well which could keep highs in the mid 80s. Elsewhere, readings will rise into the upper 80s and lower 90s. Lows will be near persistence. && .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/... Quasi-zonal midlevel flow will remain entrenched across the lower Great Lakes region through the first part of next workweek, with a quasi-stationary/oscillating front stretching from northern OH westward through northern IL. The front will gain a bit of southward momentum late Monday into Monday night as heights fall aloft and surface high pressure builds east through the heart of the Great Lakes region by Monday night. However, the front will become somewhat washed out across the area by early Tuesday, with southwesterly surface flow resuming area-wide by Tuesday afternoon. And with the remnant boundary lingering about the area on Tuesday, will maintain a chance PoP across most of the ILN FA -- especially during the diurnally-favorable time frame of afternoon/early evening. The hottest day of the extended period will likely be Monday ahead/south of the aforementioned E-W oriented front across the northern Ohio Valley -- with heat index values in the upper 90s possible across a large portion of the local area Monday afternoon. Tuesday will still feature warm and humid conditions -- although potentially not quite as warm as will be the case for the first day of the workweek. And by Wednesday, mid/upper level troughing across the Great Lakes region will become more pronounced as a stronger/better push of cooler/drier air arrives by Wednesday night into Thursday with the passage of a cold front. The arrival and subsequent progression of the cold front through the region on Wednesday will likely bring with it the best chance for widespread showers and storms during the entire long term period. While the specifics of the this system and the corresponding impacts on the sensible weather locally are still a bit uncertain, feel confident in increased chances for precipitation on Wednesday into Wednesday night before cooler and drier air arrives for the final part of the workweek. Although the front /and corresponding clouds and precipitation chances/ may linger near/south of the Ohio River early Thursday, the influx of drier air in from the north should help shunt the best afternoon/evening storm chances further south/away from the ILN FA. Therefore, will maintain a dry fcst past midday on Thursday for the entire area. && .AVIATION /06Z SUNDAY THROUGH THURSDAY/... VFR is expected, except at LUK where BR is reducing visibility. With low pressure situated to the northwest, thunderstorms are forecast to develop in a humid and unstable airmass. Went with VCTS at northern sites DAY CMH and LCK where models and radar point to a good chance for convective initiation and persistence. Dry forecast is indicated for southern sites CVG LUK and ILN being farther from moisture and forcing. Winds from the south to southwest will rise a bit over 10 knots this afternoon in a relatively tight pressure gradient ahead of the low. OUTLOOK...Thunderstorms possible Tuesday and Wednesday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS... NEAR TERM...JGL SHORT TERM... LONG TERM...KC AVIATION...Coniglio
Hazardous Weather Outlook National Weather Service Wilmington OH 508 PM EDT Sat Aug 17 2019 INZ073>075-080-KYZ089>100-OHZ073-074-077>082-088-181100- Ripley-Dearborn-Ohio-Switzerland-Carroll-Gallatin-Boone-Kenton- Campbell-Owen-Grant-Pendleton-Bracken-Robertson-Mason-Lewis-Ross- Hocking-Hamilton-Clermont-Brown-Highland-Adams-Pike-Scioto- 508 PM EDT Sat Aug 17 2019 This Hazardous Weather Outlook is for Southeast Indiana, Northeast Kentucky, Northern Kentucky, Central Ohio, South Central Ohio and Southwest Ohio. .DAY ONE...Tonight. There is a low probability for widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Heat indicies will be in the upper 90s Monday and Tuesday. .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>072- 181100- 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- 508 PM EDT Sat Aug 17 2019 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Tonight. There is a low probability for widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Heat indices will be in the upper 90s on Monday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
1056 PM EDT SAT AUG 17 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0333 PM TSTM WND DMG 6 W BATAVIA 39.08N 84.29W
08/17/2019 CLERMONT OH PUBLIC
ONE TREE AND ONE LARGE BRANCH BLOWN DOWN. TIME ESTIMATED
FROM RADAR DATA.
&&
CHSpecial Weather Statement National Weather Service Wilmington OH 223 AM EDT Sun Aug 18 2019 OHZ034-180700- Mercer OH- 223 AM EDT Sun Aug 18 2019 ...A STRONG THUNDERSTORM WILL AFFECT NORTHERN MERCER COUNTY UNTIL 300 AM EDT... At 223 AM EDT, radar indicated a strong thunderstorm near Berne, moving northeast at 25 mph. STORM HAZARDS INCLUDE... Winds to 40 mph... One half inch diameter hail... Very heavy rain... Locations impacted include... Rockford, Mendon and Chattanooga. Water will pond on roads and may quickly fill roadside ditches and small streams. Residents in these areas should remain alert. If this storm becomes stronger, then a warning may be needed. To report hazardous weather conditions, go to our website at weather.gov/iln and submit your report via social media, when you can do so safely. LAT...LON 4073 8446 4068 8445 4061 8480 4073 8480 TIME...MOT...LOC 0623Z 242DEG 23KT 4068 8484 AR
The Northern Indiana radar (KIWX), 119 km away, was scanning. The volume nearest the first event began at 06:34 UTC.
1 thunderstorm wind. Local standard time, as filed.
Damage was reported to a turkey barn and a house.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2019Every state in 2019This day in weather historyWarnings in Ohio, August 2019
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: 837420.