Showers and thunderstorms developed ahead of a cold front moving through the region.
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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.
Showers and thunderstorms developed ahead of a cold front moving 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 Aug 3, 2:46 PM EST, 1 hour 44 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 346 PM EDT Mon Aug 3 2020 .SYNOPSIS... A cold front will cross the region late tonight into Tuesday morning. High pressure will start to build in Tuesday night and then predominate through much of the rest of the week. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... Scattered to numerous showers along with some thunderstorms continue to move across the region. This activity will diminish as daytime heating wanes. Skies will likely clear for a while this evening, but then expect some more to develop/move into the area later tonight as a cold front pushes into the region. Lows will be in the lower to mid 60s. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/... A cold front will cross the forecast area during the morning. Some showers may occur along and behind the boundary. Better chance will be in eastern counties during the afternoon. Temperatures will still be able to rise into the mid 70s to lower 80s. High pressure will start to build in Tuesday night. Drier and cooler conditions will filter in with lows dropping into the 50s. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... Cool and dry conditions will start out the long term on Wednesday with high temperatures in the 70s to around 80 degrees. With CAA expect an extensive cu field to develop across the region during the daytime hours. With drier air moving in expect cu field to dissipate quickly during the evening hours. With mostly clear skies expect temperatures to drop down into the 50s to around 60 degrees Wednesday night. There will be a gradual warming trend Thursday into the weekend. Dry conditions are expected to be present through Saturday. There starts to be some uncertainly Sunday into Monday on the arrival of the next system to the region. Gradually increase precipitation chances from Sunday into the Monday timeframe. Due to uncertainty with coverage and timing, limited precipitation chances to the chance category for now and went close to the model blend for precipitation chances as well. Temperatures on Monday will potentially be a little cooler than over the weekend with additional cloud cover and precipitation chances across the region. && .AVIATION /20Z MONDAY THROUGH SATURDAY/... Scattered to numerous showers along with some thunderstorms have developed across the region and may affect any of the terminals early in the TAF period. Expect visibilities to temporarily drop to IFR with any of these storms. Activity should diminish towards 00Z. Appears that clouds will decrease somewhat during the evening and winds will become light ahead of an approaching cold front. There is enough low level moisture to cause some visibility restrictions. Fair bit of uncertainty with this as there are indications that a cloud deck could be spreading in. If this does not happen, then visibilities could drop lower than what is included in the TAFs and there is even some potential for a bit of low stratus as well. The front will move across the terminals after 11Z. When this occurs, winds will become northwest, visibilities will improve, but an MVFR deck will overspread the region. Ceilings may improve slightly towards the end of the TAF period. OUTLOOK...MVFR ceilings may linger into Tuesday afternoon. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS... NEAR TERM... SHORT TERM... LONG TERM...Novak AVIATION...
Hazardous Weather Outlook National Weather Service Wilmington OH 420 AM EDT Mon Aug 3 2020 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-040830- 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- 420 AM EDT Mon Aug 3 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 probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Wilmington OH
1159 AM EDT Mon Aug 3 2020
OHZ072-031645-
Clinton OH-
1159 AM EDT Mon Aug 3 2020
...A STRONG THUNDERSTORM WILL AFFECT NORTHERN CLINTON COUNTY UNTIL
1245 PM EDT...
At 1159 AM EDT, radar indicated a strong thunderstorm near
Wilmington, moving east at 15 mph.
STORM HAZARDS INCLUDE...
Winds to 35 mph...
Very heavy rain...
Locations impacted include...
Wilmington, Clarksville, Port William, Melvin, Reesville,
Bloomington, Ogden, Oakland, Kingman, Burtonville, Interstate 71 at
US Route 68 and Cowan Lake State Park.
This includes I-71 in Ohio between mile markers 43 and 57.
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 3935 8400 3950 8398 3956 8382 3955 8366
3944 8366
TIME...MOT...LOC 1559Z 248DEG 13KT 3943 8392
NovakSpecial Weather Statement National Weather Service Wilmington OH 354 PM EDT Mon Aug 3 2020 OHZ045-046-055-032030- Delaware OH-Franklin OH-Union OH- 354 PM EDT Mon Aug 3 2020 ...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL FRANKLIN... SOUTHWESTERN DELAWARE AND SOUTHEASTERN UNION COUNTIES IN CENTRAL OHIO UNTIL 430 PM EDT... At 353 PM EDT, radar indicated a strong thunderstorm near New California, moving east at 20 mph. STORM HAZARDS INCLUDE... Winds to 40 mph... Very heavy rain... Locations impacted include... Columbus, Dublin, Delaware, Marysville, Powell, Plain City, New California, Shawnee Hills, Ostrander, Unionville Center, Bellepoint, US Route 33 at US Route 42, Warrensburg, Watkins, Columbus Zoo, New Dover and State Route 257 at US Route 36. 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 4032 8307 4008 8307 4014 8338 4028 8337 TIME...MOT...LOC 1953Z 273DEG 16KT 4017 8329 Binau
The Cincinnati radar (KILN), 103 km away, was scanning. The volume nearest the first event began at 21:29 UTC.
2 flood, 1 thunderstorm wind. Local standard time, as filed.
Minor street flooding occurred on Kuther and Russell Roads.
Street flooding was reported on Wilmington Avenue.
A tree was knocked down onto a car on OH-73.
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, August 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: 898736, 898737, 898740.