Showers and thunderstorms affected the Ohio Valley during the afternoon and evening as a cold front moved through 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.
Showers and thunderstorms affected the Ohio Valley during the afternoon and evening as a cold front moved through 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 Jul 29, 6:26 PM EST, 1 hour 23 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 726 PM EDT Thu Jul 29 2021 .SYNOPSIS... Strong to severe thunderstorms possible through late evening Thursday. Cold front swings through tonight, providing cooler and drier into Friday and Saturday. A slight chance for showers exists Sunday, but an extended period of below average temperatures is expected into the beginning of the next work week. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... A severe thunderstorm watch has been issued for all of our counties with the exception of our northern three (Hardin, Auglaize and Mercer) until 10 PM EDT. A cluster of storms tracking southeast through western Ohio and central Ohio have already produced a number of severe reports - mainly for hail greater than 1" in diameter. While strong, damaging winds and large hail will continue to be the primary threat, several supercells have formed and will keep the threat for isolated tornadoes present with these storms. Additionally, some storms have begun training in central Ohio, which may lead to localized flooding issues. More favorable 0-6km effective shear remains across our eastern counties in central Ohio where closer to 40 kts is present. These values drop off to near 25 kts towards our western counties. SPC mesoanalysis shows MLCAPE near 2000 J/kg where these storms are located in west-central Ohio. A very moist and unstable environment will remain in place through the evening, keeping strong to severe thunderstorms present for the time being. Our northern counties in central Ohio will have the severe threat end by this evening as storms push further south over the next couple of hours. After about 10pm, the severe threat will begin to diminish, with only some scattered showers possible overnight as the cold front swings through. There could be some river fog development as well - especially further south towards the Ohio River where the moisture will remain higher the longest. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/... Drier air filters in on Friday as northwesterly flow persists aloft and surface winds shift out of the north. Some post- frontal stratus clouds will linger during the early morning hours before lifting. Still expecting scattered cu development during the day with weak instability present, but surface high pressure building in from the upper Midwest will offer drier conditions across the fa. Additionally, a relief from the heat and humidity will be felt as dewpoints drop to near or just below 60 (compared to low to mid-70s on Thursday) with high temperatures topping off in the middle 70s to lower 80s. && .LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/... Surface high pressure will be across the region on Saturday. Under a northwest flow aloft, a disturbance will pass by to our southwest. It looks like pcpn with this system will stay mostly out of our area, so we are expecting dry conditions. Highs will range from 75 to 80. A broad mid level trough will dig southeast across the Great Lakes Saturday night into Sunday. This will push a weak cold front east through the area, bringing a low chance for a shower or thunderstorm. It will remain a little cool for the beginning of August. For the reminder of the forecast, Monday through Thursday, broad mid level troughing will remain with weak high pressure across the Ohio Valley at the surface. It should stay mainly dry through the period with very low chances of pcpn perhaps by late in the week. It will continue a little below normal early week, then closer to normal later in the week. && .AVIATION /23Z THURSDAY THROUGH TUESDAY/... Storms will continue to move through KILN/KCVG/KLUK during the first couple of hours of the taf period before weakening. Most sites will still have a chance to observe a stray shower through about 06z with the approaching cold front, but the strong to severe storm threat will rapidly diminish this evening. MVFR CIGs are possible tonight, but there is still uncertainty as guidance has been flip-flopping all day. With lower confidence, just put in a SCT deck overnight and will continue to monitor trends as the night unfolds. KLUK still has the best chance at an MVFR vsby reduction with the development of river valley fog. Also put in MVFR vsbys at KILN tonight based on guidance, but confidence is lower. Overnight, winds will shift towards the north, but remain light below 10 kts. Low clouds will lift in the morning, with SCT cu development expected Friday afternoon. Northerly winds will increase to around 10 kts with VFR conditions expected. .OUTLOOK... MVFR ceilings and visibilities are possible Saturday night into Sunday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Clark NEAR TERM...Clark SHORT TERM...Clark LONG TERM...Hickman AVIATION...Clark
Hazardous Weather Outlook National Weather Service Wilmington OH 814 PM EDT Thu Jul 29 2021 INZ050-058-059-OHZ026-034-035-042>046-051>056-060>065-074-310015- Wayne-Fayette IN-Union IN-Hardin-Mercer-Auglaize-Darke-Shelby-Logan- Union OH-Delaware-Miami-Champaign-Clark-Madison-Franklin OH-Licking- Preble-Montgomery-Greene-Fayette OH-Pickaway-Fairfield-Hocking- 814 PM EDT Thu Jul 29 2021 This Hazardous Weather Outlook is for East Central Indiana, Central Ohio and West Central Ohio. .DAY ONE...Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. INZ066-073>075-080-KYZ089>100-OHZ070>073-077>082-088-310015- Franklin IN-Ripley-Dearborn-Ohio-Switzerland-Carroll-Gallatin-Boone- Kenton-Campbell-Owen-Grant-Pendleton-Bracken-Robertson-Mason-Lewis- Butler-Warren-Clinton-Ross-Hamilton-Clermont-Brown-Highland-Adams- Pike-Scioto- 814 PM EDT Thu Jul 29 2021 This Hazardous Weather Outlook is for Southeast Indiana, Northeast Kentucky, Northern Kentucky, South Central Ohio and Southwest Ohio. .DAY ONE...Tonight. Thunderstorms will continue through the early part of the night. A few storms will be capable of producing damaging winds, large hail and an isolated tornado. Heavy downpours will also lead to localized flooding. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
810 PM EDT THU JUL 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0803 PM FLOOD FRANKFORT 39.40N 83.18W
07/29/2021 ROSS OH 911 CALL CENTER
CULVERT FLOODED AND ONE LANE REPORTED CLOSED.
&&
HICKMANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
812 PM EDT THU JUL 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0803 PM FLOOD 2 ENE BOURNEVILLE 39.30N 83.12W
07/29/2021 ROSS OH 911 CALL CENTER
HIGH WATER SIGNS PLACED ON U.S. 50 DUE TO FLOODED
ROADWAY.
&&
HICKMANPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
826 PM EDT THU JUL 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0825 PM FLASH FLOOD IDAHO 39.09N 83.14W
07/29/2021 PIKE OH TRAINED SPOTTER
ROADS CLOSED NEAR IDAHO AND POINTS WEST. WATER IS
APPROACHING HOMES.
&&
ANOVAKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
827 PM EDT THU JUL 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM HEAVY RAIN IDAHO 39.09N 83.14W
07/29/2021 M3.08 INCH PIKE OH TRAINED SPOTTER
TIME ESTIMATED.
&&
ANOVAKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
828 PM EDT THU JUL 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0730 PM FLOOD SABINA 39.49N 83.63W
07/29/2021 CLINTON OH NWS EMPLOYEE
ONE TO ONE AND A HALF FOOT DEEP WATER OVER ROUTE 22.
&&
BPPPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
844 PM EDT THU JUL 29 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM FLOOD 4 WSW IDAHO 39.07N 83.21W
07/29/2021 PIKE OH 911 CALL CENTER
MULTIPLE LOCATIONS WITH WATER OVER ROADS ACROSS THE
COUNTY, INCLUDING BEAVERS RIDGE ROAD WEST-SOUTHWEST OF
IDAHO, AS WELL AS STATE ROUTE 124.
&&
BPPThe Cincinnati radar (KILN), 106 km away, was scanning. The volume nearest the first event began at 00:50 UTC.
2 thunderstorm wind, 2 flash flood. Local standard time, as filed.
Several trees were downed in the Garrison area.
A tree was downed on Burtonville Road.
Water was flowing across several roads in the Garrison area.
Three to five inches of rain resulted in flash flooding across much of western Lewis County. Numerous culverts and roads were washed out or damaged due to the flowing water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kentucky in 2021Every state in 2021This day in weather historyWarnings in Kentucky, July 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: 965409, 965410, 965408, 973863.