Strong to severe thunderstorms developed in an unstable atmosphere ahead of an advancing bow echo.
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.
Strong to severe thunderstorms developed in an unstable atmosphere ahead of an advancing bow echo.
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 20, 2:32 PM EST, 47 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Wilmington OH 332 PM EDT Tue Aug 20 2019 .SYNOPSIS... Several mid/upper level disturbances will move east through the region through Thursday, with a slow-moving surface frontal boundary drifting south during this time period. With seasonably warm and humid conditions persisting through Thursday night, periods of scattered showers and storms will be possible before drier conditions filter in area-wide for the upcoming weekend. Slightly below normal temperatures are expected for this weekend with generally drier and sunnier conditions. A few isolated storms may be possible by late Sunday afternoon. && .NEAR TERM /THROUGH TONIGHT/... A corridor of isolated to scattered thunderstorms have developed in a moderately to highly unstable environment entrenched across the heart of the ILN FA. This activity continues to blossom out ahead of a slowly-decaying MCS with attendant MCV noted on mosaic radar further to the north/west in north-central IL. For the rest of the afternoon, the corridor of scattered storms currently approximately coincident with the I-75 corridor will continue to drift east-northeast as additional isolated to scattered activity develops ahead of the decaying complex tracking south-southeast through central/southern Indiana. While the MCS-generated convection is generally moving into a favorably unstable environment characterized by MLCAPE in excess of 2500j/kg and DCAPE of 1000-1200j/kg, the leading edge continues to push further away from the MCV itself -- essentially outrunning the source that has kept it going for this long. Nevertheless, this activity is likely to trend a bit further south of southeast through mid/late afternoon -- likely grazing and impacting only the Tri-State area and points south/west of this particular area. Elsewhere, any isolated to scattered activity will be more pulsy/airmass-driven opposed to along the leading edge of a cohesive line/MCS. It is the pulsy type activity that will likely pose the greatest strong/damaging wind risk through early evening -- especially coincident with an environment that will support downward acceleration of healthier cores. Even with this said -- the highly unstable environment, with good instability aloft, will also support instances of large hail with the better/stronger cores. The best coverage of storms will gradually shift from western OH/eastern IN/northern KY from mid-afternoon through central OH and northeast KY by early this evening. There seems to be fairly good agreement in the short-term hi-res CAMs showing a downtick in convection near/past sunset as the environment becomes worked over and subsidence behind the main MCS overspreads the ILN FA. Feel pretty confident in a trend toward drier conditions by/past sunset this evening, with just a few isolated showers possible past this time period as some midlevel energy continues to propagate through the mean northwest flow in the area. However, as previously mentioned, subsidence behind the main MCS structure diving south-southwest through central KY could be enough to stifle additional isolated shower activity further north in an environment that will be fairly used up by late evening into the overnight. Highs for today have reached into the lower 90s but have likely already plateaued due to the overspreading of clouds/precipitation through the remainder of the local area over the next several hours. Some light fog will be possible late overnight with the nearly saturated low level environment. However, the pressure gradient will not completely relax -- lending itself to some uncertainty in exactly where and how widespread any fog development will be. Therefore, have not included in the official fcst although certainly observational trends will be monitored closely to see if this may eventually be warranted. Lows tonight will bottom out in the upper 60s and lower 70s area-wide. && .SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/... After any fog/stratus lifts/dissipates by late morning on Wednesday, anticipate some diurnally-enhanced Cu to develop in the region. Although the frontal boundary will still be stretched in an E-W fashion across the northern Ohio Valley on Wednesday, the absence of any focused mid/upper level disturbance and/or source for forcing is likely to keep an diurnally-driven activity to mainly isolated in nature. The approach of a disturbance by late evening may help spread some higher chance PoPs into the far western ILN FA by late evening into the overnight hours -- especially as we near the end of the short term period by Thursday morning. However, with a relatively strong cap in place, anticipate that coverage will be far less than is the case today. Scattered showers and isolated thunderstorms will be on the increase from the west towards sunrise Thursday as more S/W energy ejects east through west-central and central Ohio Valley. Highs on Wednesday will again top out around 90 degrees near the Ohio River and mainly mid to upper 80s near/north of the I-70 corridor. Heat indices south of the I-70 corridor will again be in the mid/upper 90s. Lows Wednesday night will fall into the mid/upper 60s in the north to lower 70s south of the Ohio River. && .LONG TERM /THURSDAY THROUGH TUESDAY/... Period begins with a cold front around the Ohio River. The front will provide convergence and lift in the southern part of the fa, giving the best PoPs around and south of the Ohio River. Went will likely PoPs in the far south. The front will continue to sag south Thursday night into Friday. This will keep chance PoPs in the region for Friday. By Saturday, high pressure will be settling in across the Great Lakes. This will bring cooler and drier conditions. On Sunday, an inverted trof will bring increasing humidity back into the region along with a chance of thunderstorms to northern Kentucky and the Scioto Valley. Thunderstorm chances will increase Monday and Tuesday as heat and instability increases. && .AVIATION /19Z TUESDAY THROUGH SUNDAY/... Scattered thunderstorms have developed initially across southwestern portions of the local area -- with an expectation that this activity will gradually increase in coverage as it pushes northeast through the heart of the afternoon hours. This activity will be ahead of a large storm complex which is fcst to dive southeast across central and southern portions of the Ohio Valley by late afternoon into early evening -- although currently it appears that most /if not all of/ the complex will miss the local terminals to the south and west. With the disorganized nature of the scattered thunderstorms, it is difficult to pinpoint exact time periods of impact for each of the terminals. This being said, did keep TEMPOs in for a 3-4 hour period for each site -- a period in which coverage and likelihood of a terminal being impacted -- will be the highest. With any of these thunderstorms, brief but rapid reductions in VSBYs and CIGs are possible -- but maintained the TEMPO MVFR VSBYs for now. Will handle further reductions in VSBYs beyond MVFR with amendments as needed. Scattered thunderstorms will be on a marked decrease in coverage around and/or shortly after 00z as it gradually shifts east of the local terminals. While some isolated activity cannot be completely ruled out beyond 00z (especially some -SHRA between about 04z-09z for KDAY and KILN), do think that most of the area will see dry conditions after sunset as subsidence overtakes the area. With a fair amount of moisture lingering in the low levels late overnight, expect some BR and/or light FG to develop -- especially for areas which receive appreciable rainfall this afternoon. The best likelihood looks to be for northern sites and KLUK, but with the gradient not completely relaxing (i.e. winds not expected to go completely calm), do think that widespread and/or dense fog may be very localized. Could also see some patchy MVFR or IFR CIGs near/north of the I-70 corridor in the several hour period around/after sunrise Wednesday. Light southwesterly winds of around 10kts are expected this afternoon, with light westerly winds of around 10kts towards the end of the period. OUTLOOK...Thunderstorms possible at times from tonight through Thursday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...KC NEAR TERM...KC SHORT TERM...KC LONG TERM...Sites AVIATION...KC
Hazardous Weather Outlook National Weather Service Wilmington OH 231 PM EDT Tue Aug 20 2019 INZ050-058-059-066-073>075-080-KYZ089>092-094-OHZ046-051>056-060>065- 070>072-077-211845- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Owen-Delaware-Miami- Champaign-Clark-Madison-Franklin OH-Licking-Preble-Montgomery-Greene- Fayette OH-Pickaway-Fairfield-Butler-Warren-Clinton-Hamilton- 231 PM EDT Tue Aug 20 2019 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northern Kentucky, Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...This afternoon and tonight. Scattered to numerous thunderstorms are expected this afternoon through early evening. These storms will have the potential to produce damaging wind gusts and some large hail. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Heat indices will be in the mid 90s Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon. OHZ026-034-035-042>045-211845- Hardin-Mercer-Auglaize-Darke-Shelby-Logan-Union OH- 231 PM EDT Tue Aug 20 2019 This Hazardous Weather Outlook is for Central Ohio and West Central Ohio. .DAY ONE...This afternoon and tonight. Scattered to numerous thunderstorms are expected this afternoon through early evening. These storms will have the potential to produce damaging wind gusts and some large hail. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon. KYZ093-095>100-OHZ073-074-078>082-088-211845- Campbell-Grant-Pendleton-Bracken-Robertson-Mason-Lewis-Ross-Hocking- Clermont-Brown-Highland-Adams-Pike-Scioto- 231 PM EDT Tue Aug 20 2019 This Hazardous Weather Outlook is for Northeast Kentucky, Northern Kentucky, Central Ohio, South Central Ohio and Southwest Ohio. .DAY ONE...This afternoon and tonight. Scattered to numerous thunderstorms are expected this afternoon through early evening. These storms will have the potential to produce damaging wind gusts and some large hail. Additionally, heat indices in the upper 90s to around 100 degrees will be possible through early this evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Heat indices will be in the mid 90s Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
341 PM EDT TUE AUG 20 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0331 PM TSTM WND GST KCVG CINC N KY APT 39.05N 84.66W
08/20/2019 M53 MPH BOONE KY ASOS
&&
JEGSpecial Weather Statement
National Weather Service Wilmington OH
341 PM EDT Tue Aug 20 2019
KYZ091>093-095-096-OHZ070-077-202015-
Boone KY-Pendleton KY-Kenton KY-Campbell KY-Grant KY-Hamilton OH-
Butler OH-
341 PM EDT Tue Aug 20 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT KENTON...CAMPBELL...
BOONE...NORTHERN GRANT...NORTHWESTERN PENDLETON...CENTRAL HAMILTON
AND SOUTH CENTRAL BUTLER COUNTIES UNTIL 415 PM EDT...
At 340 PM EDT, radar indicated strong thunderstorms along a line
extending from Blue Jay to Independence to Crittenden, moving east at
25 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
One half inch diameter hail...
Very heavy rain...
Locations impacted include...
Cincinnati, Hamilton, Fairfield, Covington, Florence, Independence,
Norwood, Forest Park, Erlanger, Fort Thomas, Newport, Harrison, North
College Hill, Edgewood, Alexandria, Elsmere, Wyoming, Cheviot, Fort
Mitchell and Villa Hills.
This includes the following Interstates...
I-71 in Kentucky between mile markers 74 and 77.
I-71 in Ohio between mile markers 0 and 7.
I-74 in Ohio between mile markers 3 and 19.
I-75 in Kentucky between mile markers 160 and 191.
I-75 in Ohio between mile markers 0 and 10.
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 3869 8474 3877 8470 3878 8466 3880 8469
3892 8463 3924 8481 3937 8459 3898 8430
3869 8440
TIME...MOT...LOC 1940Z 261DEG 20KT 3922 8473 3893 8455 3877 8462
FranksSpecial Weather Statement
National Weather Service Wilmington OH
344 PM EDT Tue Aug 20 2019
INZ066-073>075-080-202045-
Switzerland IN-Franklin IN-Ripley IN-Ohio IN-Dearborn IN-
344 PM EDT Tue Aug 20 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT OHIO...SOUTHWESTERN
FRANKLIN...RIPLEY...WESTERN DEARBORN AND NORTHWESTERN SWITZERLAND
COUNTIES UNTIL 445 PM EDT...
At 344 PM EDT, radar indicated strong thunderstorms along a line
extending from near Greensburg to near Vernon to 11 miles north of
Scottsburg, moving east at 25 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
Very heavy rain...
Locations impacted include...
Batesville, Versailles, Milan, Osgood, Dillsboro, Oldenburg, Moores
Hill, Pleasant, Sunman, Holton, Napoleon, Millhousen, Rexville,
Huntersville, Cold Springs, Penntown, Avonburg, Moorefield, Farmers
Retreat and Friendship.
This includes I-74 in Indiana between mile markers 145 and 157.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
Residents in these areas should remain alert. If these storms become
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 3920 8544 3927 8530 3938 8529 3935 8508
3892 8505 3877 8520 3892 8520 3891 8544
TIME...MOT...LOC 1944Z 285DEG 23KT 3933 8558 3903 8553 3884 8570
FranksSpecial Weather Statement National Weather Service Wilmington OH 405 PM EDT Tue Aug 20 2019 INZ066-074-202030- Franklin IN-Dearborn IN- 405 PM EDT Tue Aug 20 2019 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN FRANKLIN AND NORTHEASTERN DEARBORN COUNTIES UNTIL 430 PM EDT... At 405 PM EDT, radar indicated a strong thunderstorm 9 miles northwest of Bright, moving east at 15 mph. STORM HAZARDS INCLUDE... Winds to 40 mph... Penny size hail... Very heavy rain... Locations impacted include... Bright, Logan, St. Leon, West Harrison, New Trenton, Dover, Lawrenceville, Interstate 74 at US Route 52, New Alsace and Rockdale. This includes the following Interstates... I-74 in Indiana between mile markers 158 and 171. I-74 in Ohio near mile marker 0. 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 3930 8507 3937 8482 3924 8482 3923 8506 TIME...MOT...LOC 2005Z 259DEG 12KT 3927 8500 Franks
Special Weather Statement
National Weather Service Wilmington OH
407 PM EDT Tue Aug 20 2019
OHZ070-071-077-202030-
Hamilton OH-Warren OH-Butler OH-
407 PM EDT Tue Aug 20 2019
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN HAMILTON...
SOUTHEASTERN BUTLER AND SOUTHWESTERN WARREN COUNTIES UNTIL 430 PM
EDT...
At 407 PM EDT, radar indicated a strong thunderstorm over Mount
Healthy, moving northeast at 25 mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
One half inch diameter hail...
Locations impacted include...
Cincinnati, Hamilton, Middletown, Fairfield, Mason, Forest Park,
Sharonville, Monroe, Blue Ash, Loveland, Trenton, Springdale,
Reading, Montgomery, North College Hill, Wyoming, Mount Healthy,
South Middletown, Finneytown and West Chester.
This includes the following Interstates...
I-71 in Ohio between mile markers 16 and 25.
I-74 in Ohio near mile marker 18.
I-75 in Ohio between mile markers 10 and 31.
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 3916 8456 3930 8469 3943 8463 3952 8437
3941 8427 3929 8425
TIME...MOT...LOC 2007Z 239DEG 23KT 3926 8456
HatzosSpecial Weather Statement
National Weather Service Wilmington OH
417 PM EDT Tue Aug 20 2019
OHZ046-055-202045-
Delaware OH-Franklin OH-
417 PM EDT Tue Aug 20 2019
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN FRANKLIN AND
CENTRAL DELAWARE COUNTIES UNTIL 445 PM EDT...
At 417 PM EDT, radar indicated a strong thunderstorm over Dublin,
moving northeast at 10 mph.
STORM HAZARDS INCLUDE...
Winds to 45 mph...
One half inch diameter hail...
Frequent cloud-to-ground lightning...
Very heavy rain...
Locations impacted include...
Columbus, Dublin, Delaware, Powell, Sunbury, Polaris, Shawnee Hills,
Galena, Interstate 71 at US Route 36/State Route 37, Alum Creek State
Park, Stratford, Bellepoint, Leonardsburg, Kilbourne, Columbus Zoo
and Lewis Center.
This includes I-71 in Ohio between mile markers 122 and 136.
Do not stay in the open or seek shelter under trees when lightning
threatens. Move indoors when a thunderstorm approaches.
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 4040 8302 4028 8275 4024 8275 4007 8316
4011 8321 4011 8317 4024 8317 4025 8320
TIME...MOT...LOC 2017Z 236DEG 10KT 4014 8316
KCThe Cincinnati radar (KILN), 101 km away, was scanning. The volume nearest the first event began at 20:19 UTC.
3 thunderstorm wind. Local standard time, as filed.
A trampoline was flipped from a neighbors home on Hummingbird Court, snapping off a support pole, which completely pierced through the siding of a house, knocking a coffee machine over.
A tree was knocked down onto Dogwood Court. Also, power lines were knocked down near East Central High School.
A tree was blown down on Barber Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2019Every state in 2019This day in weather historyWarnings in Indiana, August 2019
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: 837801, 837802, 837803.