A line of thunderstorms moved through the Ohio Valley ahead of an advancing cold front.
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.
A line of thunderstorms moved through the Ohio Valley ahead of an advancing cold front.
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 27, 1:44 PM EST, 2 hours 40 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 244 PM EDT Mon Jul 27 2020 .SYNOPSIS... Occasional showers and thunderstorms can be expected tonight as a cold front moves through the region. Behind the front, a drier and more seasonable airmass will settle into the area for Tuesday and Wednesday. && .NEAR TERM /THROUGH TONIGHT/... A cold front will move southeast across the area through tonight. Fairly widespread showers and thunderstorms have developed closer to the front across central/northern Indiana and northwest Ohio, with more isolated to scattered activity farther to the southeast. The airmass across our area is moderately unstable with ml capes in the 1500 to 2000 j/kg range. Thus, expect activity to become more widespread across our area from the north/west through late afternoon into early evening ahead of the advancing front. While shear values are on the weaker side, dcapes remain quite high, generally in excess of 1000 j/kg across our area. As a result, there will remain a damaging with threat into early evening with the stronger storms. PWS are also on the high side in the 2.0-2.25 inch range so locally heavy rainfall can also be expected. Expect an overall weakening trend in the intensity and possibly coverage through the overnight hours as the pcpn sags south and we lose the diurnal heating component. && .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/... The front will continue to push south of the area on Tuesday. We could see a few lingering showers/storms across our southeast, but with drier air filtering in behind the front, generally expect to see skies becoming mostly sunny from the northwest through the day. Seasonable temperatures are expected on Tuesday with highs in the mid 80s and lows Tuesday night in the low to mid 60s. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... Slightly cooler and drier air will build into the region by late Tuesday through midweek in the post-frontal environment. Confidence remains fairly high in temperatures being near or slightly below by the end of the week -- especially with the prospect of one or more systems progressing through southern parts of the region during this time period. The local area may be caught between two areas of scattered pcpn during the day on Wednesday -- one to the north associated with mid- level energy pivoting around the base of broad upper-level troughing over the Great Lakes region and another associated with the lingering/remnant leftovers of the frontal boundary to the south toward the northern TN Valley. Either way, most of the area will see dry conditions on Wednesday, with seasonably warm temperatures before the downward trend really begins to take shape later in the week/weekend. With broad cyclonic mid/upper level flow setting up by midweek, focus will quickly turn to the ejection of a S/W from the central plains east into the mid-Mississippi River Valley by late Wednesday into Thursday. As this occurs, the front that progressed through the area late Tuesday will stall just south of the ILN FA, perhaps somewhere in the northern TN Valley or even begin to pivot back north, with fairly robust moisture transport north into the redeveloping/tightening frontal boundary by Thursday into Friday. There are still several items to work out regarding the evolution of this system and the eventual track of it east through the southern Ohio Valley/northern TN Valley late in the workweek. Subtle differences in timing and/or placement of the ingredients will yield drastically different sensible weather conditions -- depending on one's exact location. The ingredients are certainly there to support a wet pattern from Thursday into early Friday (especially near/south of the Ohio River) , with a renewed threat for widespread precipitation arriving by later Saturday into Sunday. Still much to figure out regarding the details of this pattern, so feel best right now to include likely PoPs in the far south and a slightly drier fcst in the north for Thursday/Thursday night. Should the system eject east in a bit weaker form, it may drift just south of the ILN FA, yielding more isolated impacts locally. Undoubtedly, however, the guidance/data will be watched in the coming days, especially with indications of the trailing/main S/W being rather slow to progress east this weekend into early next week. Current data suggests that the meandering S/W trof may stay to the west of the immediate area (perhaps lingering in the mid- Mississippi River Valley) through early Saturday before becoming more neutrally- tilted by Sunday as it begins to pivot northeast into the Ohio Valley. While the guidance regarding this seasonably potent system remains somewhat varied -- both spatially and temporally -- it is worth noting that some of the most recent deterministic and ensemble guidance has converged on a stronger solution with a developing closed surface low moving northeast through the region on Sunday. This would be a somewhat unusual synoptic setup given the time of the year, with the prospect of respectably strong forcing/large- scale ascent with seasonably abundant antecedent moisture/instability profiles. The collocation of these ingredients would certainly bear watching from a widespread heavy rain threat, should it materialize in such a manner. With this in mind, there is a signal for widespread rain late this coming weekend, with the details regarding placement, timing, and magnitude still to be resolved in the coming days. With moderate confidence in at least a cloudier pattern for the end of the week (and potentially wetter), temps will remain near or slightly below normal through the latter part of the long term period. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... Scattered thunderstorms have developed across the region this afternoon ahead of an advancing cold front. More widespread convection across northern Indiana and northern Ohio, closer to the front, will continue to work its way southward into our area through early evening. Showers and thunderstorm coverage should then begin to decrease in coverage/intensity as it pushes south through the night and we lose the diurnal component. Behind the pcpn, we could see a period of MVFR cigs later tonight possibly into early Tuesday morning. Drier air will then filter into the region behind the front, leading to VFR conditions through the remainder of the period. OUTLOOK...A chance of thunderstorms Thursday into Friday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...JGL NEAR TERM...JGL SHORT TERM...JGL LONG TERM...KC AVIATION...JGL
Hazardous Weather Outlook National Weather Service Wilmington OH 404 AM EDT Mon Jul 27 2020 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-280815- 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- 404 AM EDT Mon Jul 27 2020 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 combination of heat and humidity will result in heat indices in the mid and upper 90s. Some thunderstorms developing this afternoon and evening may be strong to severe with damaging winds the primary severe weather threat. In addition, locally heavy rain will be possible which may result in flooding issues. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed, while following all local, state and CDC guidelines.
Special Weather Statement
National Weather Service Wilmington OH
505 PM EDT Mon Jul 27 2020
INZ066-073-272130-
Franklin IN-Ripley IN-
505 PM EDT Mon Jul 27 2020
...A STRONG THUNDERSTORM WILL AFFECT FRANKLIN AND NORTHEASTERN RIPLEY
COUNTIES UNTIL 530 PM EDT...
At 505 PM EDT, radar indicated a strong thunderstorm near Lake
Santee, moving east at 30 mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
Locations impacted include...
Batesville, Brookville, Oldenburg, Lake Santee, Blooming Grove,
Sunman, Metamora, Laurel, Andersonville, Mounds State Recreation
Area, Huntersville, Hamburg, Ballstown, Penntown, Peppertown, Saint
Peter and Buena Vista.
This includes I-74 in Indiana between mile markers 145 and 157.
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 3927 8530 3952 8530 3952 8497 3931 8497
3931 8507 3923 8508 3924 8536
TIME...MOT...LOC 2105Z 286DEG 25KT 3945 8542
HatzosSpecial Weather Statement
National Weather Service Wilmington OH
506 PM EDT Mon Jul 27 2020
OHZ061-070-071-272130-
Montgomery OH-Warren OH-Butler OH-
506 PM EDT Mon Jul 27 2020
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN BUTLER...
NORTHWESTERN WARREN AND MONTGOMERY COUNTIES UNTIL 530 PM EDT...
At 506 PM EDT, radar indicated a strong thunderstorm near Carlisle,
moving east at 25 mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
The wind gusts may occur well ahead of any rain.
Locations impacted include...
Dayton, Hamilton, Kettering, Middletown, Trotwood, Oxford,
Miamisburg, Lebanon, Springboro, Monroe, Trenton, Franklin, Moraine,
Carlisle, Oakwood, South Middletown, West Carrollton, Waynesville,
Seven Mile and Williamsdale.
This includes I-75 in Ohio between mile markers 25 and 58.
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 3948 8476 3957 8459 3957 8448 3966 8448
3982 8439 3982 8410 3958 8412 3958 8410
3947 8410 3935 8446
TIME...MOT...LOC 2106Z 278DEG 23KT 3958 8444
HatzosSpecial Weather Statement
National Weather Service Wilmington OH
509 PM EDT Mon Jul 27 2020
OHZ046-055-056-272145-
Licking OH-Delaware OH-Franklin OH-
509 PM EDT Mon Jul 27 2020
...A STRONG THUNDERSTORM WILL AFFECT FRANKLIN...SOUTHEASTERN DELAWARE
AND SOUTHWESTERN LICKING COUNTIES UNTIL 545 PM EDT...
At 508 PM EDT, radar indicated a strong thunderstorm over Upper
Arlington, moving east at 35 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
Very heavy rain...
Locations impacted include...
Columbus, Dublin, Westerville, Reynoldsburg, Grove City, Upper
Arlington, Gahanna, Hilliard, Worthington, Bexley, Pataskala, Powell,
Johnstown, Minerva Park, Ohio State University, Polaris, Easton,
Whitehall and Etna.
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 3994 8265 3994 8281 3993 8281 3989 8319
4006 8321 4010 8321 4011 8317 4012 8317
4026 8275
TIME...MOT...LOC 2108Z 264DEG 30KT 3999 8310
JDRSpecial Weather Statement
National Weather Service Wilmington OH
513 PM EDT Mon Jul 27 2020
INZ073-272130-
Ripley IN-
513 PM EDT Mon Jul 27 2020
...A STRONG THUNDERSTORM WILL AFFECT RIPLEY COUNTY UNTIL 530 PM
EDT...
At 513 PM EDT, radar indicated a strong thunderstorm near Vernon,
moving east at 20 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
Locations impacted include...
Versailles, Osgood, Holton, Napoleon, Millhousen, Versailles Lake,
Cross Plains, Rexville, Otter Village, Benham, Olean and New Marion.
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 8544 3924 8535 3923 8515 3893 8520
3891 8521 3891 8544
TIME...MOT...LOC 2113Z 254DEG 19KT 3896 8549
HatzosSpecial Weather Statement
National Weather Service Wilmington OH
519 PM EDT Mon Jul 27 2020
INZ050-058-059-OHZ042-060-272145-
Fayette IN-Union IN-Wayne IN-Darke OH-Preble OH-
519 PM EDT Mon Jul 27 2020
...A STRONG THUNDERSTORM WILL AFFECT WAYNE...UNION AND FAYETTE
COUNTIES IN EAST CENTRAL INDIANA...NORTHWESTERN PREBLE AND SOUTHERN
DARKE COUNTIES IN WEST CENTRAL OHIO UNTIL 545 PM EDT...
At 519 PM EDT, radar indicated a strong thunderstorm over Fountain
City, moving east at 35 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
Locations impacted include...
Richmond, Connersville, Greenville, Eaton, Centerville, Cambridge
City, Liberty, Arcanum, Lewisburg, Hagerstown, New Paris, New
Madison, Fountain City, Dublin, West College Corner, Franklin, Salem,
Waterloo, Columbia and Bunker Hill.
This includes the following Interstates...
I-70 in Indiana between mile markers 134 and 156.
I-70 in Ohio between mile markers 0 and 13.
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 3979 8522 4001 8520 4000 8481 4006 8481
4014 8444 3997 8443 3957 8481 3952 8484
3953 8529 3979 8530
TIME...MOT...LOC 2119Z 265DEG 31KT 3995 8487
chSpecial Weather Statement
National Weather Service Wilmington OH
523 PM EDT Mon Jul 27 2020
INZ066-073>075-080-272145-
Switzerland IN-Franklin IN-Ripley IN-Ohio IN-Dearborn IN-
523 PM EDT Mon Jul 27 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT OHIO...FRANKLIN...
RIPLEY...DEARBORN AND NORTHWESTERN SWITZERLAND COUNTIES UNTIL 545 PM
EDT...
At 523 PM EDT, radar indicated strong thunderstorms along a line
extending from near Lake Santee to 11 miles northeast of Madison,
moving northeast at 25 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
Locations impacted include...
Batesville, Brookville, Versailles, Milan, Osgood, Dillsboro,
Oldenburg, Moores Hill, Lake Santee, Wilmington, Pleasant,
Manchester, Blooming Grove, Sunman, Metamora, St. Leon, Laurel,
Holton, Fairview and Napoleon.
This includes I-74 in Indiana between mile markers 145 and 166.
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 8544 3927 8530 3952 8530 3952 8491
3919 8491 3879 8501 3876 8520 3892 8520
3891 8544
TIME...MOT...LOC 2123Z 244DEG 22KT 3944 8521 3887 8524
HatzosThe Cincinnati radar (KILN), 93 km away, was scanning. The volume nearest the first event began at 21:23 UTC.
13 thunderstorm wind, 1 flood. Local standard time, as filed.
A few large branches were downed.
Numerous trees and power poles were downed in the vicinity of Frank, Gantz and Hoover Roads.
A few small trees were knocked over.
One 3 inch diameter branch was downed.
Several trees and power lines were downed.
A couple of large tree limbs were downed.
High water was reported on I-71 and also on Hoover Road.
Several trees were downed in the vicinity of Palmer Road and Beechwood Drive.
An outbuilding was destroyed off of Palmer Road. A billboard was also damaged south of I-70.
Several trees were downed across a road.
A tree fell onto a car.
Several large limbs were downed.
Two large limbs were downed.
A tree was downed onto Beech Road. A few small trees were also downed.
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, July 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: 898394, 898395, 898411, 898410, 898409, 898408, 898401, 898406, 898403, 898402, 898400, 898398, 898397, 898396.