Slow moving showers and thunderstorms developed in the vicinity of a stalled frontal boundary which was draped across the region. Isolated rainfall amounts were between 3 and 4 inches.
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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.
Slow moving showers and thunderstorms developed in the vicinity of a stalled frontal boundary which was draped across the region. Isolated rainfall amounts were between 3 and 4 inches.
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 Jun 30, 9:27 AM EST, 2 hours 27 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 1027 AM EDT Tue Jun 30 2020 .SYNOPSIS... A weak boundary will remain in the region through today which will serve as a focus for showers and thunderstorms for areas south and west of Columbus. High pressure building in from the north will then bring slightly drier air to the area by late Wednesday through the end of the week. Above normal temperatures are expected by late in the week through the upcoming weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Current KILN radar has area clear from convection, though visible satellite imagery beginning to show active development in near and SW of US 35, so expect to see convection begin between 16-18z. Have lowered precipitation chances through that time, and then focused along/southwest of the boundary stretching through the area. 12z KILN sounding has PW of 1.25", though areas to our southwest quickly ramp up to closer to 1.8, so expectation is thunderstorms that develop, especially with the weak steering pattern, will have the potential to dump some heavy rain. This combined with DCAPE values between 800-1000 J/Kg will also mean isolated damaging winds. Still holding on the decision to issue a flash flood watch, as not enough confidence in how widespread developing convection may be. Area with greatest potential continues to be all of northern KY, far SE Indiana and SW Ohio. Temperature forecast appears on track, so no adjustments here. Upper 80s to near 90. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/... Will see diurnally-driven storm activity near the Tri-State shift to the SW and wane fairly quickly after sunset with the loss of a good deal of instby. Cannot completely rule out a lingering shower or storm in northern KY or southeast IN past midnight with the continued high-moisture environment and maintenance of at least some weak instby through the overnight hours. But any coverage deep into the overnight will be isolated in nature. Renewed diurnally-driven activity will develop again on Wednesday, although will not be as widespread as has been the case the past several days -- even in the southwestern parts of the area where the higher PWATs/instby will be maintained even on Wednesday. Any degree of forcing for ascent appears at this time like it will be relatively weak/limited in nature, so activity will be more of the pop-up variety near/south of the Ohio River and perhaps across southwest OH/southeast IN Wednesday afternoon. Otherwise, the heat will be building, as temps reach again to near 90 in central Ohio, with some spots reaching the lower 90s as slightly drier air begins to work in from the NE to envelop a larger part of the ILN FA by Wednesday evening. Conditions should be mainly dry area-wide for Wednesday night. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Moisture and instability gradient suppressed a little southwest Wednesday. With the loss of daytime heating will just carry a very low pop early Wednesday evening across the far south. General drying trend continues to be observed in model solutions Thursday with a skinny ridge building to ILN/s west and surface high pressure building across the eastern Great Lakes. Can not rule out an isold shower or storm far south but with lack of forcing will go with a dry fcst. Warm readings with highs Thursday in the upper 80s to around 90. Mid level ridge to continue to build over the Upper MS Valley Friday. This will continue to limit convection chances, so will continue a dry forecast Friday. Expect warm highs Friday from the upper 80s to the lower 90s. Some model solution differences this weekend into early next week on exact placement of the ridge. General trend shows a little more flow from the northwest around the periphery of the ridge Sunday and Monday. Have kept Saturday dry, allowing for only slight chance pops south on Sunday and chance pops Monday -- as moisture begins to increase. Very warm to hot temperatures expected Saturday through Monday with highs generally in the lower 90s. && .AVIATION /14Z TUESDAY THROUGH SATURDAY/... A thin area of broken borderline MVFR/IFR CIGs has developed in the wake of earlier widespread convection in SW OH. This would mainly affect KILN early in the period, but suppose with it drifting to the south that it may briefly affect KLUK and/or KCVG through mid-morning as well. Isolated to scattered SHRA/TSRA continues to develop in EC IN and WC OH just west of KDAY and anticipate this activity may develop closer to the terminal through 15z, so added a VCSH at KDAY, KCVG, and KLUK for the late morning hours. Main item of interest for the daytime period will be the redevelopment of scattered to numerous afternoon/evening thunderstorms. Main axis may initially be centered near KDAY and KILN early in the afternoon to late in the afternoon before shifting/drifting SW toward the early evening toward KCVG and KLUK. Confidence remains somewhat high in a corridor of TSRA developing from perhaps just south of KDAY to near KILN after 18z, so did add TEMPO TSRAs for these sites. Central OH sites of KCMH and KLCK will remain dry. For southwestern sites of KCVG and KLUK, activity may remain a bit more isolated in nature through late afternoon before storms from near KDAY/KILN drift southwest closer to the Tri-State by early/mid evening. Storm activity should wane near/shortly after sunset, with not much in the way of overnight activity through Wednesday morning expect perhaps for very isolated showers near KCVG and KLUK through about 03z or so. Winds will generally remain light and VRB but will tend to go more northeasterly/easterly for all sites except KCVG and KLUK by 00z. With a continued near-saturated low level environment and weak low level flow, we may see BR/FG develop late tonight in areas that receive appreciable rainfall during the day today. This may lead to MVFR or IFR VSBYs for southern sites -- especially KILN and KLUK in the predawn hours. OUTLOOK...No significant weather expected. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...KC NEAR TERM...JDR SHORT TERM...KC LONG TERM...AR AVIATION...KC
Hazardous Weather Outlook National Weather Service Wilmington OH 412 AM EDT Tue Jun 30 2020 OHZ026-034-035-043>046-052>056-063>065-073-074-010815- Hardin-Mercer-Auglaize-Shelby-Logan-Union OH-Delaware-Champaign- Clark-Madison-Franklin OH-Licking-Fayette OH-Pickaway-Fairfield-Ross- Hocking- 412 AM EDT Tue Jun 30 2020 This Hazardous Weather Outlook is for Central Ohio, South Central Ohio and West Central Ohio. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. INZ050-058-059-066-073>075-080-KYZ089>100-OHZ042-051-060>062-070>072- 077>082-088-010815- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant- Pendleton-Bracken-Robertson-Mason-Lewis-Darke-Miami-Preble- Montgomery-Greene-Butler-Warren-Clinton-Hamilton-Clermont-Brown- Highland-Adams-Pike-Scioto- 412 AM EDT Tue Jun 30 2020 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northeast Kentucky, Northern Kentucky, South Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Today and tonight. Slow moving showers and thunderstorms are expected through this evening. Heavy rain rates will be possible with this activity, which may lead to localized flooding. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Wilmington OH
1241 PM EDT Tue Jun 30 2020
OHZ071-301715-
Warren OH-
1241 PM EDT Tue Jun 30 2020
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL WARREN COUNTY UNTIL 115
PM EDT...
At 1241 PM EDT, radar indicated a strong thunderstorm over Lebanon,
moving southeast at 10 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
Pea size hail...
Very heavy rain...
Locations impacted include...
Middletown, Mason, Lebanon, Monroe, Morrow, Hunter, Kings Island,
Highpoint, Four Bridges, South Lebanon, Maineville, Butlerville,
Murdock, State Route 123 at State Route 132, Hageman, State Route 63
at State Route 741, Fort Ancient, Kings Mills, Pekin and Socialville.
This includes the following Interstates...
I-71 in Ohio between mile markers 20 and 35.
I-75 in Ohio between mile markers 29 and 32.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
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 3944 8434 3949 8434 3954 8417 3928 8401
3929 8427 3929 8435 3934 8435
TIME...MOT...LOC 1641Z 331DEG 10KT 3944 8423
SitesThe Cincinnati radar (KILN), 41 km away, was scanning. The volume nearest the first event began at 16:52 UTC.
5 flash flood, 4 thunderstorm wind, 3 flood. Local standard time, as filed.
One tree and numerous tree limbs were knocked down.
Approximately a dozen trees were reported down in Armco Park.
Small branches were knocked down and lawn furniture was blown around.
Water entered a first floor apartment. Other units also flooded at The Redwoods in Lebanon.
Moderate street flooding was reported.
High water was reported on the road at the intersection of Moore-Marathon/Hunt Road on OH-131. An accident occurred at the location.
Widespread flooding was reported with some cars under water.
A manhole cover was being pushed up by water in Eaton.
Trees were reported down between McDowell Street and Home Avenue.
A basement was flooded in Xenia.
High water was reported at the intersection of Kellogg and Sutton.
Ponding of water occurred on Winton Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2020Every state in 2020This day in weather historyWarnings in Ohio, June 2020
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: 891203, 891204, 891205, 891025, 891026, 891034, 891035, 891052, 891206, 891184, 891186, 891191.