A surface low moving through the area helped to trigger clusters of thunderstorms during the afternoon. Some of these storms became organized to produce the threat of damaging winds.
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 surface low moving through the area helped to trigger clusters of thunderstorms during the afternoon. Some of these storms became organized to produce the threat of damaging winds.
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, 1:45 PM EST, 1 hour 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 245 PM EDT FRI JUL 27 2012 .SYNOPSIS... A COLD FRONT WILL MOVE THROUGH THE REGION THIS AFTERNOON AND EVENING. HIGH PRESSURE WILL GRADUALLY BUILD IN FROM THE NORTHWEST THROUGH THE WEEKEND. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... AN UPR LVL S/WV LOCATED OVER THE WRN GREAT LAKES THIS MORNING WILL PIVOT SE ACRS THE REGION LATE THIS AFTN AND OVERNIGHT. AN AREA OF WEAK LOW PRESSURE AND A SFC COLD FRONT WILL ACCOMPANY THIS FEATURE AS THEY SLOWLY MOVE SOUTHEAST THROUGH THE REGION OVERNIGHT. THE COMBINATION OF THESE FEATURES WILL INTERACT WITH A MOIST AND UNSTABLE AIRMASS THIS AFTERNOON AND EVENING...RESULTING IN CONVECTIVE DEVELOPMENT FROM EARLY AFTERNOON INTO THE EVENING HOURS. LATEST HRRR AND NAM SUGGEST THAT CONVECTION WILL GET GOING ACRS NRN AND CENTRAL INDIANA EARLY THIS AFTERNOON...AND SHOULD PROPAGATE SE THROUGH OUR AREA THIS AFTERNOON INTO THIS EVENING. WITH BULK SHEAR IN THE 25 TO 35 KNOT RANGE...STORMS SHOULD EXHIBIT SOME ORGANIZATION WITH MULTICELLS PERHAPS MERGING INTO LINEAR BOWING SEGMENTS. IN ADDITION...WITH THE SFC LOW APPROACHING OUR NW CWFA...THERE WILL BE SOME DIRECTIONAL SHEAR THAT MAY CAUSE A FEW STORMS TO ROTATE. AS A RESULT OF ALL THESE FACTORS...HAVE GONE WITH LIKELY POPS THIS AFTERNOON AND HAVE PLACED SEVERE WORDING IN THE FORECAST. MAIN SEVERE WEATHER THREAT WILL BE DAMAGING WINDS WITH SEVERE HAIL THE SECONDARY THREAT. AN ISOLATED TORNADO CAN NOT BE RULED OUT...ESPECIALLY ACRS THE NWRN CWFA. ALTHOUGH STORMS WILL HAVE SOME MOTION 20 TO 30 MPH AND RAINFALL RATES WILL NOT BE AS HIGH AS YESTERDAY...OUR SE CWFA RECEIVED SUBSTANTIAL RAINFALL AMOUNTS IN THE 3 TO 5 INCHES RAIN OVER THE LAST 24 HOURS. THIS HAS RESULTED IN MOIST IF NOT NEARLY SATURATED SOILS IN THESE LOCALES. 1 HOUR FFG SUBSEQUENTLY ARE RANGING ANY WHERE BETWEEN A HALF INCH TO AN INCH. GIVEN THIS SETUP...ANY STORMS THAT FORM TODAY...AND IF THEY MOVE OVER THE SAME AREAS IN THE SE CWFA...THIS WILL LIKELY RESULT IN AN INCREASED FLOOD THREAT...WITH THE POTENTIAL FOR FLASH FLOODING. HAVE ISSUES A FLASH FLOOD WATCH FOR THE SE CWFA IN EFFECT FROM 18Z THIS AFTN TO 08Z EARLY SATURDAY MORNING. AS FOR TEMPERATURES AND DEWPOINTS...IT WILL BE ANOTHER VERY WARM TO LOCALLY HOT DAY WITH HIGHS GENERALLY IN THE UPPER 80S TO THE LOWER 90S AND DEWPOINTS IN THE MID 60S TO AROUND 70. THIS SHOULD KEEP HEAT INDICES IN THE MID TO UPPER 90S. && .SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/... SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BE ONGOING INTO THE EVENING ACROSS THE REGION PARTICULARLY IN THE EAST BEFORE MOVING OFF AS THE COLD FRONT CONTINUES TO PROGRESS EASTWARD. INCREASED LOW LEVEL MOISTURE AND WEAK COLD ADVECTION BEHIND THE FRONT SHOULD RESULT IN THE DEVELOPMENT OF LOW CLOUDS THAT WILL LAST WELL INTO SATURDAY MORNING. COULD STILL SEE A FEW SHOWERS AND THUNDERSTORMS DEVELOP ON SATURDAY PRIMARILY IN THE NORTHERN COUNTIES WITH HEATING AND A WEAK DISTURBANCE DROPPING INTO THE UPPER TROUGH. AS HIGH PRESSURE BUILDS OVER THE AREA SATURDAY NIGHT AND SUNDAY... CONDITIONS WILL BE QUIESCENT. FOLLOWING RECENT TRENDS HAVE PATTERNED TEMPERATURE FORECAST NEAR OR SLIGHTLY ABOVE WARMER MOS GUIDANCE. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... NORTHWEST FLOW WILL PREVAIL THROUGH MOST OF THE WEEK. THIS PATTERN IS CONDUCIVE TO CONVECTIVE DEVELOPMENT AS DISTURBANCES DROP SOUTHEAST. HOWEVER THESE DISTURBANCES ARE OFTEN DIFFICULT TO TRACK AND TIME. AT THIS POINT HAVE INCLUDED LOW CHANCE POPS MAINLY DURING THE DAYTIME PERIODS. TEMPERATURES WILL REMAIN ABOVE NORMAL. && .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/... AN UPPER LEVEL DISTURBANCE OVER THE WESTERN GREAT LAKES THIS AFTERNOON WILL PIVOT SE ACRS THE REMAINDER OF THE GREAT LAKES TONIGHT AND SATURDAY. THIS WILL SLOWLY PUSH A WEAK AREA OF LOW PRESSURE AND ASSOCIATED COLD FRONT SOUTHEAST THROUGH THE REGION. THE APPROACH OF THIS DISTURBANCE AND PREFRONTAL CONVERGENCE AHEAD OF THE FRONT WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS ACRS THE AREA EARLY THIS AFTN. MODELS SUGGEST THAT MULTICELLULAR THUNDERSTORMS COULD CONGEAL INTO BOWING SEGMENTS WITH POSSIBLE TWO ROUND OF CONVECTION MOVING OVER THE REGION. AS SUCH...BELIEVE THUNDERSTORM CHANCES ARE HIGH ENOUGH TO WARRANT AT ALL TAF SITES. HOWEVER...EXACT TIMING IS STILL DIFFICULT AT THIS POINT AND HAVE THUS GONE WITH A PREDOMINANT VCTS WITH TEMPO MVFR AND THUNDER. WILL AMENDMENT TAFS ACCORDINGLY FOR WIND AND/OR HAIL PER RADAR OBSERVATIONS. FOR THE OVERNIGHT HOURS...CONVECTION SHOULD PUSH TO THE EAST/SOUTHEAST THIS EVENING. STILL CAN NOT RULE OUT A SHOWER OR STORM OVERNIGHT WITH THE DISTURBANCE STILL IN THE REGION...BUT CHANCES ARE LOW ENOUGH TO NOT MENTION ATTM. OF GREATER CONCERN WILL BE LOW LEVEL MOISTURE ADVECTING SOUTH AROUND WEAK LOW PRESSURE/COLD FRONT. THIS MOISTURE...COMBINED WITH WEAK COLD AIR ADVECTION...HAS THE POTENTIAL TO REALIZE ITSELF AS A STRATUS DECK LATE TONIGHT INTO SATURDAY MORNING. SOME MVFR/IFR VSBYS WILL BE POSSIBLE AS WELL AND HOW LOW THESE BECOME WILL DEPEND ON HOW FAST MID LVL CLOUDS EXIT THE REGION BEFORE LOW STRATUS FORMS. HAVE GONE WITH IFR CIGS AND MVFR/IFR VSBYS ATTM. ON SATURDAY...LOW LEVEL MOISTURE/STRATUS SHOULD LIFT INTO VFR CUMULUS AND/OR MODERATE CUMULUS BY SATURDAY AFTERNOON WHILE VSBYS WILL IMPROVE TO VFR AS WELL. CAN NOT RULE OUT A POP UP SHOWER OR STORM ACRS THE ERN TAF SITES...BUT THEN AGAIN...IT IS TOO LOW TO BE CONCERNED ABOUT ATTM. UNDER A NW FLOW ALOFT...SURFACE HIGH PRESSURE IS FORECAST TO BUILD SOUTHEAST INTO THE GREAT LAKES AND OHIO VALLEY SATURDAY NIGHT INTO SUNDAY. .OUTLOOK...THUNDERSTORMS ARE POSSIBLE MONDAY AND TUESDAY. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR OHZ079>082-088. KY...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR KYZ098>100. IN...NONE. && SYNOPSIS...HICKMAN NEAR TERM...HICKMAN SHORT TERM... LONG TERM... AVIATION...HICKMAN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 1156 AM EDT FRI JUL 27 2012 INZ050-058-059-OHZ026-034-035-042>046-051>056-060>065-072>074-281600- 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-CLINTON-ROSS- HOCKING- 1156 AM EDT FRI JUL 27 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...THIS AFTERNOON AND TONIGHT. A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. SHOWERS AND THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT THAT WILL MOVE INTO THE AREA THIS AFTERNOON AND EVENING. THE ATMOSPHERE WILL BE UNSTABLE ENOUGH FOR A FEW OF THESE STORMS TO REACH SEVERE LIMITS WITH DAMAGING STRAIGHT LINE WINDS BEING THE MAIN THREAT. LARGE HAIL WILL BE A SECONDARY. ENOUGH DIRECTIONAL SHEAR IN THE ATMOSPHERE WILL POSE AN ISOLATED TORNADO THREAT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. INZ066-073>075-080-KYZ089>097-OHZ070-071-077-078-281600- FRANKLIN IN-RIPLEY-DEARBORN-OHIO-SWITZERLAND-CARROLL-GALLATIN-BOONE- KENTON-CAMPBELL-OWEN-GRANT-PENDLETON-BRACKEN-BUTLER-WARREN-HAMILTON- CLERMONT- 1156 AM EDT FRI JUL 27 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST INDIANA...NORTHERN KENTUCKY AND SOUTHWEST OHIO. .DAY ONE...THIS AFTERNOON AND TONIGHT. A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. SHOWERS AND THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT THAT WILL MOVE INTO THE AREA THIS AFTERNOON AND EVENING. THE ATMOSPHERE WILL BE UNSTABLE ENOUGH FOR A FEW OF THESE STORMS TO REACH SEVERE LIMITS WITH DAMAGING STRAIGHT LINE WINDS BEING THE MAIN THREAT. LARGE HAIL WILL BE A SECONDARY. ENOUGH DIRECTIONAL SHEAR IN THE ATMOSPHERE WILL POSE AN ISOLATED TORNADO THREAT. ALSO...THE COMBINATION OF TEMPERATURE AND HUMIDITY WILL RESULT IN THE HEAT INDEX RISING INTO THE MID TO UPPER 90S THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. KYZ098>100-OHZ079>082-088-281600- ROBERTSON-MASON-LEWIS-BROWN-HIGHLAND-ADAMS-PIKE-SCIOTO- 1156 AM EDT FRI JUL 27 2012 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST KENTUCKY...NORTHERN KENTUCKY AND SOUTH CENTRAL OHIO. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLASH FLOOD WATCH. A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. SHOWERS AND THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT THAT WILL MOVE INTO THE AREA THIS AFTERNOON AND EVENING. THE ATMOSPHERE WILL BE UNSTABLE ENOUGH FOR A FEW OF THESE STORMS TO REACH SEVERE LIMITS WITH DAMAGING STRAIGHT LINE WINDS BEING THE MAIN THREAT. LARGE HAIL WILL BE A SECONDARY. ENOUGH DIRECTIONAL SHEAR IN THE ATMOSPHERE WILL POSE AN ISOLATED TORNADO THREAT. FURTHERMORE...LOCALLY HEAVY RAIN WILL BE POSSIBLE...ESPECIALLY IF STORMS REPEATEDLY MOVE ACROSS THE SAME LOCATION. AREAS THAT HAD HEAVY RAIN OVERNIGHT WILL BE PARTICULARLY VULNERABLE TO ADDITIONAL FLOODING OR FLASH FLOODING IF HEAVY RAIN OCCURS. ALSO...THE COMBINATION OF TEMPERATURE AND HUMIDITY WILL RESULT IN THE HEAT INDEX RISING INTO THE MID TO UPPER 90S THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
1050 AM EDT FRI JUL 27 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0130 AM FLASH FLOOD 2 S LEWISBURG 38.52N 83.76W
07/27/2012 MASON KY DEPT OF HIGHWAYS
MILL CREEK ROSE AND BRIEFLY FLOODED ROAD. TIME ESTIMATED.
0130 AM FLASH FLOOD 5 W WASHINGTON 38.61N 83.91W
07/27/2012 MASON KY DEPT OF HIGHWAYS
BRANDYWINE CREEK ROSE AND BRIEFLY FLOODED ROADWAY. TIME
ESTIMATED.
&&
SNYDERPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
115 PM EDT FRI JUL 27 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0716 PM TSTM WND DMG 2 SSW HILLSBORO 39.18N 83.62W
07/26/2012 HIGHLAND OH LAW ENFORCEMENT
TREE DOWN ON DUNLAP ROAD NEAR US 62. TIME ESTIMATED FROM
RADAR.
0728 PM TSTM WND DMG 1 E KINCAID SPRINGS 39.10N 83.26W
07/26/2012 PIKE OH DEPT OF HIGHWAYS
TREES DOWN ON SR 124 AND SR 772.
0730 PM TSTM WND DMG 2 NNW BUFORD 39.10N 83.85W
07/26/2012 HIGHLAND OH LAW ENFORCEMENT
TREE DOWN ON SR 286 ABOUT A HALF MILE WEST OF SR 134.
TIME ESTIMATED FROM RADAR.
0730 PM TSTM WND DMG 4 ENE SARDINIA 39.04N 83.73W
07/26/2012 HIGHLAND OH LAW ENFORCEMENT
TREE DOWN NEAR SR 321 AND WILDCAT ROAD. ALSO A TREE DOWN
ON TAYLORSVILLE ROAD. TIME ESTIMATED FROM RADAR.
&&
KURZPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
216 PM EDT FRI JUL 27 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0826 PM TSTM WND DMG 4 WNW CRITTENDEN 38.79N 84.68W
07/26/2012 BOONE KY LAW ENFORCEMENT
TREE LIMBS DOWN NEAR WALLER AND MUNK ROADS. TIME
ESTIMATED FROM RADAR.
&&
KURZSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
353 PM EDT FRI JUL 27 2012
INZ058-059-066-272030-
UNION IN-FRANKLIN IN-FAYETTE IN-
353 PM EDT FRI JUL 27 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN FAYETTE...
FRANKLIN AND UNION COUNTIES THROUGH 430 PM EDT...
AT 349 PM EDT...RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE
EXTENDING FROM EVERTON TO HAMBURG...MOVING EAST AT 30 MPH.
WIND GUSTS TO 45 MPH AND ONE HALF INCH DIAMETER HAIL ARE POSSIBLE
WITH THESE STORMS.
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...LIBERTY...BROOKVILLE
AND WEST COLLEGE CORNER.
ALSO...PEPPERTOWN...METAMORA...BROWNSVILLE...BLOOMING GROVE...
DUNLAPSVILLE...WHITEWATER STATE PARK...MOUNDS STATE RECREATION AREA
AND SALEM ARE NEAR THE PATH OF THIS LINE OF STRONG THUNDERSTORMS.
LAT...LON 3965 8521 3969 8481 3935 8483 3936 8530
3945 8531
HATZOSThe Indianapolis radar (KIND), 98 km away, was scanning. The volume nearest the first event began at 19:56 UTC.
4 thunderstorm wind. Local standard time, as filed.
Several large trees were downed, parts of roofing were removed from a business, and a billboard was blown down due to thunderstorm winds.
Several trees were downed due to damaging thunderstorm winds.
Three semi trucks were overturned on Interstate 275 due to thunderstorm winds. A large highway sign was also bent over and multiple trees were snapped along the highway.
Two trees were snapped in half due to thunderstorm winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2012Every state in 2012This day in weather historyWarnings in Indiana, July 2012
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: 403850, 403851, 403854, 403855.