Training thunderstorms moved across northern Kentucky and south central Ohio beginning during the late evening hours and continuing into the overnight hours.
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.
Training thunderstorms moved across northern Kentucky and south central Ohio beginning during the late evening hours and continuing into the overnight hours.
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 20, 10:02 PM EST, 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 1102 PM EDT TUE JUL 20 2010 .SYNOPSIS... A FRONTAL BOUNDARY WILL REMAIN STRETCHED ACROSS THE MID MISSISSIPPI AND OHIO VALLEYS THROUGH THE WEEK. SEVERAL DISTURBANCES WILL MOVE EASTWARD THROUGH THE REGION...RESULTING IN CHANCES FOR SHOWERS AND THUNDERSTORMS. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/... SHOWERS AND THUNDERSTORMS ARE MOVING THROUGH THE SOUTHERN THIRD OF THE FORECAST AREA AT THIS TIME. BUT SCATTERED ACTIVITY MAY CONTINUE IN THIS SAME AREA THROUGH THE NIGHT AS AN AXIS OF MOISTURE CONVERGENCE HAS SET UP FROM CENTRAL ILLINOIS INTO WESTERN WEST VIRGINIA. IF THIS DOES CONTINUE THEN THE FLOOD THREAT WILL INCREASE ALONG AND SOUTH OF THE OHIO RIVER. APPEARS THAT NORTHERN ZONES WILL BE DRY THROUGH THE NIGHT. && .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY NIGHT/... TRICKY CONVECTIVE FORECAST WILL CONTINUE WEDNESDAY WITH ZONAL FLOW ALOFT AND EMBEDDED DISTURBANCES PROVIDING FOCUSING AT VARIOUS TIMES. AGAIN...FEEL THE BETTER CHANCE FOR PRECIPITATION LOOKS TO BE IN THE SOUTHERN HALF OF THE CWA...CLOSER TO THE BOUNDARY AND THE LIKELY BETTER INSTABILITY. AS IS USUALLY THE CASE...LINGERING CLOUD COVER WILL PLAY A BIG ROLE IN WHAT AREAS ACTUALLY DO GET ENOUGH SUN TO DESTABILIZE MORE SIGNIFICANTLY. WITH THE AMOUNT OF SUN BEING THE MAIN QUESTION MARK FOR TEMPERATURES...WILL GO CLOSE TO THE MIDDLE OF THE ROAD WITH GUIDANCE (BIAS-CORRECTING THE NAM OR SREF LOOKED REASONABLE). THIS PUTS VALUES SIMILAR TO WHAT IS OUT THERE TODAY. BY WEDNESDAY NIGHT...A DRY PUSH WILL BE COMING IN FROM THE NORTH...HELPING TO TEMPORARILY END THE CHANCE OF PRECIPITATION FOR THE NORTHERN THIRD OF THE CWA. THIS WILL ALSO HELP LOWS DROP A BIT LOWER THAN SEEN IN THE PRECEDING COUPLE OF NIGHTS. && .LONG TERM /FRIDAY THROUGH TUESDAY/... MODELS AGREE ON MIN/LULL IN TS ACTIVITY THU NGT INTO FRI WITH FNT TO THE N. GFS IS QUICKER IN PUSHING THE SFC LOW E ALONG WITH CDFNT AND PCPN. LEANED TOWARDS THE SLOWER EC SOLUTION BASED ON THOUGHTS ABOVE. SO KEPT PCPN IN SAT INTO SAT NGT. HIGH PRESSURE BUILDS IN FOR THE LATER PART OF THE FORECAST PERIOD. FOR TEMPS...WENT A MODEL BLEND OF GFS MOS/HPC. LOOKS LIKE FRI WILL BE THE WARMEST DAY OF THE PERIOD WITH THE REGION WARM SECTORED. && .AVIATION /03Z WEDNESDAY THROUGH SUNDAY/... APPEARS THAT VFR CONDITIONS WILL PREVAIL THROUGH THE NIGHT. THERE IS A CHANCE OF ADDITIONAL STORMS MOVING INTO THE REGION AFTER 12Z WITH A HIGHER PROBABILITY FOR THE CINCINNATI AREA. CONSIDERABLE UNCERTAINTY IN THIS REGARD AND HAVE ONLY INCLUDED A CB QUALIFIER AT KCVG AND KLUK. CUMULUS WILL DEVELOP DURING THE DAY WITH RELATIVELY LOW BASES. OUTLOOK...THUNDERSTORMS POSSIBLE THURSDAY AND AGAIN SATURDAY THROUGH SUNDAY. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...HATZOS NEAR TERM... SHORT TERM...HATZOS LONG TERM...CONIGLIO AVIATION...
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 455 AM EDT TUE JUL 20 2010 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-210900- 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- 455 AM EDT TUE JUL 20 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...TODAY AND TONIGHT. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON AND TONIGHT. A FEW OF THESE THUNDERSTORMS MAY BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS. HEAVY RAIN WILL ALSO BE POSSIBLE...WHICH MAY LEAD TO AREAS OF MINOR FLOODING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. SHOWERS AND THUNDERSTORMS ARE POSSIBLE WEDNESDAY AND WEDNESDAY NIGHT. DAMAGING WIND GUSTS AND HEAVY RAIN WILL BE POSSIBLE WITH SOME OF THESE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TODAY AND WEDNESDAY.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
618 PM EDT TUE JUL 20 2010
KYZ092-093-096-OHZ077>079-202300-
CAMPBELL KY-KENTON KY-PENDLETON KY-CLERMONT OH-HAMILTON OH-BROWN OH-
618 PM EDT TUE JUL 20 2010
...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT
BROWN...SOUTHEASTERN HAMILTON...CLERMONT...NORTHEASTERN
PENDLETON...KENTON AND CAMPBELL COUNTIES THROUGH 700 PM EDT...
AT 616 PM EDT...RADAR INDICATED STRONG THUNDERSTORMS EXTENDING FROM
NEAR TAYLOR MILL TO FEESBURG...MOVING NORTHEAST AT 25 MPH.
WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE STORMS. IN
ADDITION...VERY HEAVY RAIN CAN BE EXPECTED.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...COLD SPRING...HIGHLAND
HEIGHTS...SILVER GROVE...MELBOURNE...GEORGETOWN...BETHEL...AMELIA...
ANDERSON TOWNSHIP...WITHAMSVILLE...BATAVIA...WILLIAMSBURG AND
MILFORD.
ALSO...SALTAIR...CRESTVIEW...FEESBURG...BLAIRSVILLE...NICHOLSVILLE...
NEW PALESTINE...LINDALE AND HAMERSVILLE ARE NEAR THE PATH OF THESE
LINE OF STRONG THUNDERSTORMS.
WATER WILL POND ON ROADS AND MAY QUICKLY FILL ROADSIDE DITCHES AND
SMALL STREAMS.
REMAIN ALERT IN CASE THESE STORMS STRENGTHEN FURTHER...AND WARNINGS
BECOME NECESSARY.
LAT...LON 3887 8449 3900 8457 3926 8414 3909 8387
3902 8387 3902 8374 3898 8368 3879 8400
HATZOSSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON OH 651 PM EDT TUE JUL 20 2010 OHZ070-071-077-202330- HAMILTON OH-BUTLER OH-WARREN OH- 651 PM EDT TUE JUL 20 2010 ...A STRONG THUNDERSTORM WILL AFFECT WESTERN WARREN...SOUTHEASTERN BUTLER AND NORTHEASTERN HAMILTON COUNTIES THROUGH 730 PM EDT... AT 649 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR PLEASANT RUN...MOVING EAST AT 20 MPH. WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM. SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...FOREST PARK... FAIRFIELD...HAMILTON...WYOMING...SPRINGDALE...SHARONVILLE...BLUE ASH...MONROE...MASON...LOVELAND AND LEBANON. ALSO...PLEASANT RUN FARM...GREENHILLS...LOCKLAND...WOODLAWN...LINCOLN HEIGHTS...GLENDALE...EVENDALE AND BECKETT RIDGE ARE NEAR THE PATH OF THIS STRONG THUNDERSTORM. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT. IF THIS STORM BECOMES STRONGER...THEN A WARNING MAY BE NEEDED. LAT...LON 3957 8417 3930 8412 3919 8462 3936 8466 HATZOS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
957 PM EDT TUE JUL 20 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0950 PM HEAVY RAIN 3 ESE TOLLESBORO 38.55N 83.52W
07/20/2010 E1.69 INCH LEWIS KY TRAINED SPOTTER
TOTAL FOR 07/20 AS OF 950 PM. SPOTTER LOCATION IS SOUTH
OF RIBOLT.
&&
HATZOSThe Cincinnati radar (KILN), 74 km away, was scanning. The volume nearest the first event began at 03:53 UTC.
7 flash flood, 3 flood. Local standard time, as filed.
High water was across several roads in Augusta due to heavy rainfall.
Numerous roads were closed due to high water. Some families were evacuated from their homes in eastern portions of the county.
Several roads were closed across the southern half of the county due to high water. The high water also made it to some homes in the area.
Numerous roads were closed due to high water caused by heavy rainfall.
Widespread flash flooding occurred across southern portions of the county. Numerous people were trapped and had to be rescued.
A bridge was washed out due to flash flooding. Flash flooding was widespread around the area.
Numerous roads were washed out due to flash flooding. In addition there were multiple water rescues from homes. At least three mobile homes and a grocery store were swept off their foundation. Major damage occurred to residences, businesses, vehicles, and roads across southern portions of the county.
This flooding is a continuation from the earlier flash flooding in the area.
This flooding is a continuation of the earlier flash flooding.
This flooding is a continuation of the earlier flash flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kentucky in 2010Every state in 2010This day in weather historyWarnings in Kentucky, July 2010
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: 245618, 245619, 245617, 245620, 245621, 245622, 245623, 245627, 245628, 245629.