Slow moving thunderstorms developed during the afternoon hours in a warm and humid airmass.
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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 thunderstorms developed during the afternoon hours in a warm and humid airmass.
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 10, 6:36 PM EST, 39 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 736 PM EDT Thu Jun 10 2021 .SYNOPSIS... A moist airmass combined with a stalled surface boundary will keep the threat for showers and thunderstorms in the Ohio Valley through Friday. Warm and humid weather is forecast to persist through the weekend, while a disturbance moving through the Great Lakes may trigger additional showers and thunderstorms Saturday. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... Showers have dissipated in the center of the CWA while persisting in northern and southern counties. Have adjusted pops and cloud cover for this evening accordingly. May still see showers overnight mainly in southeast counties where an upper trough will be interacting with an MCV and a humid airmass. Have also added patchy fog that should form in the humid and calm conditions as temperatures drop to the upper 60s to near 70. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/... Any storms/showers that are present early in the day will become more active in the morning as the upper trough passes east, the surface trough lingers over the region and cold air enters on northerly flow aloft. The north flow and cold air intrusion over a moist surface will likely bring the better chances for thunderstorms in the region, particularly in the early to mid afternoon as daytime heating combines with unstable air and abundant moisture. Highs will top out in the low 80s in the east under a bit more cloud cover and proximity to earlier showers, to the mid 80s over and west of the I-75 corridor with more sunshine. Clearing in the evening and a removal of rain chances will see lows drop slightly to the mid 60s in most locations, a few upper 60s lingering south of metro Cincinnati. && .LONG TERM /SATURDAY THROUGH THURSDAY/... Increasingly amplified pattern across the CONUS for the extended, with an impressively strong upper ridge building over the SW CONUS dominating the weather pattern, and a deep trough that develops into a cutoff low over Ontario/Quebec. This will serve to keep the mid Ohio Valley under NW flow through pretty much the entire period. For the start of the period Saturday, drier air will descend into the region accompanied by a cold frontal passage later in the day. While the anomalously high PW values will diminish by then, the descent of dry air will result in some steepening lapse rates through the day. This combined with SB CAPES of 1500-2k could make for a storm or two to become strong. With the loss of deeper moisture though, not expecting much in the way of coverage. The cold front will then push through the entire area by Sunday morning, so precipitation will wane from NW to SE, with some isolated precipitation during the day on Sunday. As the departing trough deepens Sunday night across the eastern US, and the aforementioned ridge in the SW CONUS begins to build, so begins the prolonged period of NW flow across the region into next week. There is some potential for showers in especially northern and central Ohio on Monday, as a sharp but quickly moving shortwave wraps around the Canadian upper low. After this system quickly exits, NW flow will dominate with a very different environment of highs in the upper 70s to lower 80s and dewpoints in the upper 40s to lower 50s, allowing for much more comfortable conditions than that of current conditions. && .AVIATION /00Z FRIDAY THROUGH TUESDAY/... Scattered showers that have developed in the vicinity of TAF sites should dissipate with loss of heating this evening. Overnight to Friday morning, MVFR conditions are expected as ceilings and BR form under a humid airmass and light winds. VFR and VCSH return by Friday afternoon under increasing instability and forcing associated with a weak surface low. Winds around the loosely organized low should stay under 10 knots while exhibiting a northwesterly direction. .OUTLOOK...Showers with MVFR to IFR possible through Saturday, along with a chance of an afternoon thunderstorm. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Franks NEAR TERM...Coniglio/Franks SHORT TERM...Franks LONG TERM...JDR AVIATION...Coniglio
Hazardous Weather Outlook National Weather Service Wilmington OH 1144 AM EDT Thu Jun 10 2021 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-111545- 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- 1144 AM EDT Thu Jun 10 2021 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...This afternoon and tonight. Scattered showers are expected to develop this afternoon, along with isolated thunderstorms. The moist airmass over the region has increased the possibility for torrential rainfall, which could lead to isolated flooding under a slow moving storm. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Scattered showers and thunderstorms are expected Friday afternoon. The moist airmass over the region has increased the possibility for torrential rainfall which could lead to isolated flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
402 PM EDT THU JUN 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0345 PM FLOOD 2 WSW ALLENSVILLE 38.87N 85.04W
06/10/2021 SWITZERLAND IN LAW ENFORCEMENT
HIGH WATER OVER INTERSECTION OF SHILOH ROAD AND ROUTE
250. ROAD NOT CLOSED, BUT SHALLOW WATER OVER THE ROAD.
&&
JDRSpecial Weather Statement National Weather Service Wilmington OH 802 PM EDT Thu Jun 10 2021 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-110215- 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- Including the cities of Richmond, Connersville, Liberty, West College Corner, Brookville, Batesville, Milan, Versailles, Lawrenceburg, Aurora, Rising Sun, Vevay, Carrollton, Warsaw, Florence, Burlington, Oakbrook, Covington, Erlanger, Independence, Newport, Alexandria, Owenton, Williamstown, Crittenden, Dry Ridge, Falmouth, Butler, Augusta, Brooksville, Mount Olivet, Maysville, Vanceburg, Tollesboro, Kenton, Ada, Celina, Coldwater, Wapakoneta, St. Marys, Greenville, Sidney, Bellefontaine, Marysville, Delaware, Troy, Piqua, Tipp City, Urbana, Springfield, London, West Jefferson, Plain City, Columbus, Newark, Eaton, Camden, Dayton, Kettering, Beavercreek, Fairborn, Xenia, Washington Court House, Circleville, Lancaster, Pickerington, Hamilton, Middletown, Fairfield, Oxford, Mason, Lebanon, Springboro, Wilmington, Blanchester, Chillicothe, Logan, Cincinnati, Milford, Georgetown, Mount Orab, Hillsboro, Greenfield, West Union, Peebles, Waverly, Piketon, Portsmouth, and Wheelersburg 802 PM EDT Thu Jun 10 2021 ...FUNNEL CLOUDS OCCURRING THIS EVENING... Funnel clouds are being observed this evening. The funnel clouds are associated with weak circulations around showers that are developing in a humid and unstable airmass. No damage has been reported since the funnel clouds are remaining above the ground. The chance for funnel clouds should diminish after sunset as temperatures decrease and showers dissipate. Coniglio
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
808 PM EDT THU JUN 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0506 PM FUNNEL CLOUD 5 NNW WAPAKONETA 40.64N 84.21W
06/10/2021 AUGLAIZE OH 911 CALL CENTER
EARLIER REPORT OF A FUNNEL CLOUD LOOKING NORTH.
0746 PM FUNNEL CLOUD 4 NE BLUE ASH 39.29N 84.33W
06/10/2021 HAMILTON OH EMERGENCY MNGR
EM PASSED ALONG MULTIPLE REPORTS OF FUNNEL CLOUDS IN
HAMILTON COUNTY.
0749 PM FUNNEL CLOUD 1 SSE NEW WESTON 40.33N 84.64W
06/10/2021 DARKE OH FIRE DEPT/RESCUE
BRIEF FUNNEL CLOUD REPORTED LOOKING NORTH FROM ELDORA
SPEEDWAY.
&&
NMCGINNIThe national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
High water was reported on Graham-Jones Road.
High water was reported along State Route 180 east of Laurelville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2021Every state in 2021This day in weather historyWarnings in Ohio, June 2021
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: 953563, 953564.