Scattered thunderstorms developed during the afternoon hours in a warm and moist air mass in place across the Ohio Valley.
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.
Scattered thunderstorms developed during the afternoon hours in a warm and moist air mass in place across the Ohio Valley.
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 Sep 5, 12:23 PM EST, 3 hours 47 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 123 PM EDT Wed Sep 5 2018 .SYNOPSIS... Hot and humid weather will continue today in the southerly circulation around high pressure centered to the east. Scattered showers and storms are possible mainly during the afternoon hours. A cold front sagging south will bring an increased chance for showers and storms, along with cooler temperatures on Thursday into Friday. A wave of low pressure tracking through the Great Lakes will keep an enhanced chance of showers and thunderstorms in the forecast this weekend. The potential for heavy rain will exist late this weekend as tropical moisture from the remnants of Gordon affect the region. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Patches of high clouds moving in from the south are the only clouds in the ILN forecast area this morning. This will change as diurnal cumulus builds up after 11AM, eventually becoming SCT/BKN by early afternoon. A surface high and a mid-level ridge remain centered east of the region, with some weak convergence expected to develop over the area, with winds turning from south to southwest with northward extent. Precipitable water values are around an inch and a half (based on the 12Z KILN sounding) but this should increase somewhat today in the southerly flow. Instability looks different from model to model (2000-2500 J/kg on the NAM, 1000-1500 on the GFS) but there will be enough (in an uncapped environment) to support convective development -- and perhaps a little greater coverage than yesterday. Still thinking that the severe threat looks minimal but not quite zero, with some risk for isolated downburst winds (strong, if not severe) and heavy rainfall (especially as storms will be moving slowly). Still, this risk will be very isolated, and not organized at all. No changes appeared necessary for the temperature forecast, though dewpoints were raised by about a degree, which allows heat indices to get very close to 100 for a couple hours this afternoon. Previous discussion > Mid level ridge center will shift a little east off the mid Atlantic this afternoon. A southerly flow around the back side of this ridge will continue to keep the Ohio Valley in hot and humid weather conditions. Highs to be close to yesterday and generally in the lower 90s. The combination of the temperatures and humidity will result in max heat indices in the mid and upper 90s. Will issue a special weather statement to highlight this continued heat wave. Moderate instability develops again today and an axis of weak low level convergence should aid the development of scattered afternoon thunderstorms. Bulk shear will be marginal around 20 kts, but with steep low level lapse rates a few of the stronger updrafts could produce strong to damaging winds. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/... Ongoing scattered storms will diminish in coverage this evening with the loss of heating. There will likely be a dry period from late this evening into the overnight hours. The westerlies sag south with an e-w oriented surface front pushing into ILN/s northern counties by 12z Thursday. This front along with lingering marginal instability will offer a slight chance of a thunderstorm across the north late. Mild lows are again expected in the lower 70s. The slow moving front will slide south through the region on Thursday. The low level convergence and moderate instby will provide a better chance for showers and thunderstorms Thursday. Have a period of likely pops across the central and south to account for this threat. Temperatures will be cooler due to clouds/pcpn, with highs from near 80 northwest to the upper 80s southeast. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Remnants of Gordon are likely to bring rain and gusty winds during the weekend. Cold front will be settling just south of the Ohio River Thursday night and Friday, and showers and a few thunderstorms may linger especially in southern locations. After a brief reduction in pops Friday night to early Saturday, numerous showers and a few thunderstorms can be expected late Saturday through Sunday, when the remnants of Gordon will travel up to Illinois, placing ILN in the warm conveyor belt lift zone ahead of the low. Winds will become gusty as the pressure gradient tightens between the remnant low and high pressure residing over Southern Canada. Thunderstorm occurrence should be limited by CAPE values up to 200 J/KG. With an airmass containing 2 inches PWAT in a regime featuring high warm cloud depth and small drop size favorable for efficient rainfall, current model projections suggest 2 to 3 inches of rain over the weekend. The probability of showers and thunderstorms will decrease Monday and Tuesday when the low is forecast to be exiting through Southern Canada, leaving a boundary across the Central Appalachians. After highs reach the near normal low 80s Friday, precip, clouds and eventually cold advection will reduce highs to the 70s for the rest of the period from Saturday through Tuesday. && .AVIATION /17Z WEDNESDAY THROUGH SUNDAY/... Prevailing VFR conditions are expected this afternoon and evening, but with some showers and thunderstorms also expected to continue to develop. Will continue the VCTS in the TAFs, with an eye toward amendments for any MVFR/IFR conditions that may develop as a result of precipitation. Some brief gusty winds could also be possible under the heavier storms. Prevailing VFR conditions should continue into the overnight hours, but some fog will likely develop, with MVFR conditions expected at times for most of the TAF sites (and LIFR at KLUK). Winds will shift to the north on Thursday, likely remaining at or below 10 knots. Chances for showers and storms will increase on Thursday morning and into the afternoon, and VCSH/VCTS will be used to indicate this. It should be noted that precipitation chances will end up being quite a bit higher on Thursday than they were on Wednesday, so some prevailing SHRA/TSRA will likely eventually be needed for this period of the TAFs. OUTLOOK...Thunderstorms will remain possible at times from Thursday evening through Sunday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...AR NEAR TERM...Hatzos/AR SHORT TERM...AR LONG TERM...Coniglio AVIATION...Hatzos
Hazardous Weather Outlook National Weather Service Wilmington OH 439 AM EDT Wed Sep 5 2018 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-060845- 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- 439 AM EDT Wed Sep 5 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. Hot weather conditions will continue with heat indices topping out in the mid to upper 90s this afternoon. Scattered storms will develop this afternoon. A few of the stronger storms may contain strong to damaging wind gusts and heavy rain. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. As remnants of tropical storm Gordon move into the Ohio Valley, the potential for heavy rain will exist this weekend. At this time the best threat for heavy rain looks to be Saturday night and Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Wilmington OH
428 PM EDT WED SEP 5 2018
OHZ077-052100-
Hamilton OH-
428 PM EDT WED SEP 5 2018
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL HAMILTON COUNTY UNTIL
500 PM EDT...
At 428 PM EDT, radar indicated a strong thunderstorm over North
College Hill, moving northeast at 15 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
One half inch diameter hail...
Frequent cloud-to-ground lightning...
Very heavy rain...
Locations impacted include...
Cincinnati, Covington, Norwood, Forest Park, Newport, Sharonville,
Blue Ash, Springdale, Reading, Montgomery, North College Hill,
Madeira, Wyoming, Cheviot, Villa Hills, Mount Healthy, Bellevue, Deer
Park, Dayton and Ludlow.
This includes the following Interstates...
I-71 in Ohio between mile markers 0 and 14.
I-74 in Ohio between mile markers 8 and 19.
I-75 in Ohio between mile markers 0 and 17.
Do not stay in the open or seek shelter under trees when lightning
threatens. Move indoors when a thunderstorm approaches.
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 3920 8473 3930 8443 3919 8432 3912 8443
3912 8447 3910 8449 3909 8453 3910 8455
3908 8457 3907 8461 3907 8462
TIME...MOT...LOC 2028Z 240DEG 15KT 3920 8454
HickmanPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
431 PM EDT WED SEP 5 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0346 PM TSTM WND DMG 5 SE SIDNEY 40.25N 84.09W
09/05/2018 SHELBY OH 911 CALL CENTER
LARGE TREE DOWN. TIME ESTIMATED FROM RADAR DATA.
&&
CHSpecial Weather Statement
National Weather Service Wilmington OH
436 PM EDT WED SEP 5 2018
OHZ053-054-052100-
Madison OH-Clark OH-
436 PM EDT WED SEP 5 2018
...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CLARK AND
SOUTHWESTERN MADISON COUNTIES UNTIL 500 PM EDT...
At 436 PM EDT, radar indicated a strong thunderstorm near
Jeffersonville, moving northeast at 20 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
Pea size hail...
Frequent cloud-to-ground lightning...
Very heavy rain...
Locations impacted include...
London, South Solon, Midway and Newport.
This includes I-71 in Ohio near mile marker 76.
Do not stay in the open or seek shelter under trees when lightning
threatens. Move indoors when a thunderstorm approaches.
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 3988 8338 3970 8343 3971 8360 3973 8365
3974 8365 3992 8355
TIME...MOT...LOC 2036Z 211DEG 19KT 3975 8356
HickmanSpecial Weather Statement National Weather Service Wilmington OH 503 PM EDT WED SEP 5 2018 OHZ070-077-052130- Hamilton OH-Butler OH- 503 PM EDT WED SEP 5 2018 ...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL HAMILTON AND CENTRAL BUTLER COUNTIES UNTIL 530 PM EDT... At 503 PM EDT, radar indicated a strong thunderstorm over Fairfield, moving north at 25 mph. STORM HAZARDS INCLUDE... Winds to 45 mph... Penny size hail... Very heavy rain... Locations impacted include... Hamilton, Middletown, Fairfield, Forest Park, Monroe, Trenton, Springdale, Ross, Seven Mile, Williamsdale, Dunlap, Greenhills, Woodlawn, New Miami, Glendale, Mount Healthy Heights, Pleasant Run, Collinsville, Maustown and Pleasant Run Farm. 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 3926 8447 3927 8464 3952 8463 3950 8440 TIME...MOT...LOC 2103Z 193DEG 23KT 3932 8453 JDR
Special Weather Statement
National Weather Service Wilmington OH
504 PM EDT WED SEP 5 2018
KYZ095-096-052130-
Pendleton KY-Grant KY-
504 PM EDT WED SEP 5 2018
...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN GRANT AND
SOUTHWESTERN PENDLETON COUNTIES UNTIL 530 PM EDT...
At 503 PM EDT, radar indicated a strong thunderstorm 8 miles
southeast of Williamstown, moving north at 25 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
One half inch diameter hail...
Frequent cloud-to-ground lightning...
Very heavy rain...
Locations impacted include...
Williamstown, Falmouth, Dry Ridge, Morgan, Corinth, Goforth, Cherry
Grove, Williamstown Lake, Knoxville, Marcus, Catawba, Camp Northward,
Gene Snyder Airport and Cordova.
This includes I-75 in Kentucky between mile markers 143 and 160.
Do not stay in the open or seek shelter under trees when lightning
threatens. Move indoors when a thunderstorm approaches.
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 3848 8459 3871 8464 3873 8430 3857 8433
3856 8439 3856 8442 3854 8442 3854 8445
3853 8445 3854 8447 3851 8449 3851 8452
3849 8456 3847 8458
TIME...MOT...LOC 2103Z 184DEG 21KT 3854 8448
HickmanPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
506 PM EDT WED SEP 5 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM HAIL FAIRFIELD 39.33N 84.54W
09/05/2018 E0.75 INCH BUTLER OH TRAINED SPOTTER
&&
JDRThe Cincinnati radar (KILN), 86 km away, was scanning. The volume nearest the first event began at 21:12 UTC.
1 flood, 1 lightning, 1 hail. Local standard time, as filed.
A few inches of water was flowing across Downing Drive near the AA Highway.
Six different structures caught fire due to lightning strikes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kentucky in 2018Every state in 2018This day in weather historyWarnings in Kentucky, September 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: 772578, 772580, 772579.