Isolated thunderstorms produced locally heavy rainfall.
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.
Isolated thunderstorms produced locally heavy rainfall.
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 17, 9:05 AM EST, 1 hour 55 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 1005 AM EDT Tue Aug 17 2021 .SYNOPSIS... Several systems will work through the region, allowing for precipitation chances each day through the weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Most of the fog has finally burned off this morning with the help of minor insolation and surface winds increasing to about 5 mph. A band of rain showers stretching along I-71 has developed and will continue to slowly track north. Scattered showers are possible across the entire CWA through the rest of today, with CAMs suggesting that the best coverage will be closer towards west-central Ohio into portions of the upper Miami Valley. Bufkit soundings still have PWATs in the 1.8-1.9" range, so heavy downpours in these showers could lead to isolated flooding issues. Don't have any flood headlines or mention in the HWO as the threat will be fairly isolated, but will monitor some of the 12z model trends and update any potential hazard threat as needed. While some embedded thunder will be possible in these showers today, not expecting any severe threat in these conditions. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/... There will be a decrease in precipitation as the evening progresses. Later in the overnight hours though the remnants of Fred will bring precipitation to portions of the Scioto River Valley. This system will move out of the area Wednesday morning, however some additional isolated to scattered precipitation will be possible on Wednesday. Slightly warmer conditions will be in place for Wednesday with high temperatures generally in the 80s. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... A weak mid level trough is forecast to gradually lift into the Great Lakes during the Wednesday night into Friday time frame. As it does, it is expected to close off in the process. This feature, along with weak embedded disturbances rotating through it, will continue to bring a chance of showers and thunderstorms to the region. Shower/thunderstorm coverage will be the highest during the afternoon and early evening due to overall weak forcing but higher instability during the peak diurnal cycle. Locally heavy rain will still be a concern due to pwats in the 1.50 to 2.00 inch range, along with slow storm motion. It will be warm and humid with highs in the lower to mid 80s and lows in the 60s. It appears that the mid level closed low will be "kicked" east by an upstream mid level trough moving across the northern Plains this weekend. However, a weak boundary and lingering moisture is expected to move west to east through the region, which will keep the threat for showers and thunderstorms going. It does look like that perhaps chances will be much lower by Sunday as the weak boundary moves east. It will be slightly warmer with highs in the mid to upper 80s and lows in the 60s. Mid level ridging will try to build east/northeast into the Ohio Valley early next week. However, being on the periphery, there still may be a low risk for a shower/storm. Temperatures will be slightly above normal. && .AVIATION /14Z TUESDAY THROUGH SATURDAY/... Fog and stratus have developed at or near the TAF sites. Have varying degrees of this in the TAFs this morning with some improving conditions during the morning hours. Shower and some thunderstorm activity is expected to develop today and then decrease after sunset. A few showers will be possible towards the end of KCMH and KLCK TAFs associated with the remnants of Fred. There will be the potential for some fog and stratus Tuesday night into Wednesday morning, however not expecting the coverage that is present this morning. Winds will generally be light and less than 10 knots at the TAF sites. OUTLOOK...MVFR/IFR ceilings and visibilities, along with thunderstorms, will be possible at times through Saturday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Novak NEAR TERM...Clark SHORT TERM...Novak LONG TERM...Hickman AVIATION...Novak
Hazardous Weather Outlook National Weather Service Wilmington OH 919 AM EDT Tue Aug 17 2021 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-181330- 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- 919 AM EDT Tue Aug 17 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...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement National Weather Service Wilmington OH 753 AM EDT Tue Aug 17 2021 INZ050-058-059-066-073-074-OHZ026-034-035-042>046-051>054-056- 060>063-070>072-077-171300- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Hardin- Mercer-Auglaize-Darke-Shelby-Logan-Union OH-Delaware-Miami- Champaign-Clark-Madison-Licking-Preble-Montgomery-Greene- Fayette OH-Butler-Warren-Clinton-Hamilton- Including the cities of Richmond, Connersville, Liberty, West College Corner, Brookville, Batesville, Milan, Versailles, Lawrenceburg, Aurora, Kenton, Ada, Celina, Coldwater, Wapakoneta, St. Marys, Greenville, Sidney, Bellefontaine, Marysville, Delaware, Troy, Piqua, Tipp City, Urbana, Springfield, London, West Jefferson, Plain City, Newark, Eaton, Camden, Dayton, Kettering, Beavercreek, Fairborn, Xenia, Washington Court House, Hamilton, Middletown, Fairfield, Oxford, Mason, Lebanon, Springboro, Wilmington, Blanchester, and Cincinnati 753 AM EDT Tue Aug 17 2021 ...PATCHY DENSE FOG THIS MORNING... Patchy dense fog will continue this morning. Use extra caution if traveling early this morning and remain alert for changing visibility.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
1159 AM EDT TUE AUG 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1151 AM HEAVY RAIN SUMMIT STATION 40.00N 82.75W
08/17/2021 M3.22 INCH LICKING OH PUBLIC
3.22 INCHES OF RAINFALL SO FAR TODAY.
&&
LCThe Cincinnati radar (KILN), 111 km away, was scanning. The volume nearest the first event began at 16:00 UTC.
2 flash flood, 1 flood. Local standard time, as filed.
Eight to ten inches of water was flowing across a roadway.
Water was flowing across several roads in the Reynoldsburg area. Several basements were flooded and one house suffered a partial collapse of a basement wall.
High water was reported on Reading Road.
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, August 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: 967763, 967764, 967765.