A potent upper level through combined with a very moist air mass to produce showers and thunderstorms. These showers and thunderstorms were capable of producing very heavy rain and flooding.
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 potent upper level through combined with a very moist air mass to produce showers and thunderstorms. These showers and thunderstorms were capable of producing very heavy rain and flooding.
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 11, 3:10 PM EST, 2 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 410 PM EDT MON AUG 11 2014 .SYNOPSIS... A POTENT UPPER LEVEL TROUGH WILL COMBINE WITH A VERY MOIST AIRMASS TO PRODUCE SHOWERS AND THUNDERSTORMS TONIGHT. ADDITIONAL UPPER LEVEL ENERGY WILL SWING ACROSS THE REGION TUESDAY KEEPING THE CHANCE OF PRECIPITATION IN THE FORECAST. THE SYSTEM WILL MOVE EAST ON WEDNESDAY...USHERING IN A DRY PATTERN LATER THIS WEEK. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... LOW PRESSURE IS CENTERED OVER WEST CENTRAL OHIO. COOLER AIR ALOFT ASSOCIATED WITH A DIGGING UPPER TROUGH IS COUPLING WITH DAYTIME HEATING TO PRODUCE CAPES ABOVE 2000 J/KG. NUMEROUS SHOWERS AND THUNDERSTORMS HAVE DEVELOPED IN THIS UNSTABLE REGIME...ENHANCED BY INCREASING WIND FIELDS AT THE SURFACE AND ALOFT INTO PERSISTENT CELLS AND LINES. THEREFORE...HAVE CONTINUED CATEGORICAL POPS INTO TONIGHT. CONVECTION WILL MOVE EAST AND DIMINISH LATER TONIGHT WHEN THE REGION EXPERIENCES A SHARP REDUCTION OF FORCING AND INSTABILITY AS THE LOW LIFTS NORTHEAST AND DAYTIME HEATING WANES. DUE TO A VERY MOIST AIRMASS CONTAINING 140 PERCENT OF NORMAL PRECIPITABLE WATER AND RATHER SLOW MOVING AND TRAINING CELLS PRODUCING HEAVY DOWNPOURS...LOCALIZED FLOODING ISSUES MAY ARISE TONIGHT AT LOCATIONS THAT EXPERIENCE REPETITIVE THUNDERSTORMS. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/... TUESDAY WILL FEATURE THE ARRIVAL OF A SECONDARY SURFACE TROUGH BENEATH THE CONTINUED PRESENCE OF AN UPPER TROUGH AND COOLER AIR ALOFT. A BRIEF LULL IN CONVECTION TUESDAY MORNING WILL BE FOLLOWED BY A GOOD CHANCE FOR SHOWERS AND THUNDERSTORMS BY TUESDAY AFTERNOON AS INSTABILITY RETURNS...AIDED BY SURFACE CONVERGENCE IN A PERSISTENTLY HUMID AIRMASS. MODERATELY STRONG WINDS FIELDS AND INSTABILITY MAY ALLOW A FEW THUNDERSTORMS TO APPROACH SEVERE LIMITS. HIGHS IN THE 70S ARE EXPECTED IN AN ENVIRONMENT OF COLD ADVECTION AND LIMITED SUNSHINE. FOR WEDNESDAY...DRIER WEATHER WILL BE FILTERING IN ON A NORTHERLY LOW LEVEL FLOW AHEAD OF HIGH PRESSURE TO THE WEST. SOME MODEL UNCERTAINTY EXISTS WITH RESPECT TO THE EFFECTS OF AN UPPER DISTURBANCE OVER NORTHEAST OHIO. DECIDED TO KEEP FORECAST DRY FOR NOW AND LATER SHIFTS MAY NEED TO ADD A CHANCE OF SHOWERS IF MODELS SHOW A TREND TOWARD THE SOUTHWEST WITH THIS FEATURE. TEMPERATURES ON WEDNESDAY WILL STAY BELOW NORMAL...WITH HIGHS FORECAST TO BE IN THE MID 70S TO ABOUT 80. && .LONG TERM /THURSDAY THROUGH SUNDAY/... NORTHWEST FLOW ALOFT AT THE BEGINNING OF THE PERIOD WILL FLATTEN AND BECOME MORE ZONAL OVER THE WEEKEND. 12Z MODELS ARE IN REASONABLE AGREEMENT THAT A SHORT WAVE WILL PUSH INTO THE REGION ON MONDAY. AT THE SURFACE HIGH PRESSURE WILL DOMINATE LATE IN THE WEEK BEFORE SLIDING OFF TO THE SOUTHEAST DURING THE WEEKEND. CANNOT COMPLETELY RULE OUT SOME STORMS ACROSS THE NORTHERN COUNTIES OVER THE WEEKEND ON THE SOUTHERN FRINGE OF A MORE ACTIVE CONVECTIVE CORRIDOR ACROSS THE GREAT LAKES. BUT BETTER CHANCE OF SHOWERS AND THUNDERSTORMS ARE EXPECTED ON MONDAY. TEMPERATURES EARLY IN THE PERIOD WILL BE BELOW NORMAL BUT THEN WARM TO ABOVE NORMAL EARLY NEXT WEEK. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS HAVE DEVELOPED IN A MOIST ATMOSPHERE AHEAD OF A COLD FRONT AND STRENGTHENING UPPER DISTURBANCE. WITH A HIT OR MISS NATURE AND LACK OF THUNDER...ONLY USED A VCSH AT THE TAF SITES THROUGH THE MID AFTERNOON HOURS. A MORE FOCUSED AREA OF SHOWERS AND STORMS WILL MOVE EAST ACROSS THE AREA DURING THE LATE AFTERNOON AND EARLY EVENING...AND TRIED TO TIME THIS THROUGH WITH TEMPO GROUPS. IFR CONDITIONS ARE POSSIBLE IN THE STRONGER CORES...BUT ANY SUCH ACTIVITY WILL HAVE TO BE HANDLED WITH AMENDMENTS AS ITS COVERAGE BECOMES BETTER DEFINED. LOCALLY HEAVY RAIN IS POSSIBLE EVEN WITH A LACK OF LIGHTNING. THE BACK EDGE OF PRECIPITATION POTENTIAL MAY BE FAIRLY WELL DEFINED MOVING WEST TO EAST THIS EVENING...BUT HANDLED TIMING AND COVERAGE UNCERTAINTY WITH A PERIOD OF VCSH. WINDS WILL VEER FROM SOUTHERLY TO SOUTHWESTERLY OR WESTERLY WITH THE SURFACE TROUGH PASSAGE THIS EVENING. OVERNIGHT...THERE ARE STRONG INDICATIONS IN FORECAST GUIDANCE OF IFR CEILINGS DEVELOPING. THE DURATION IS UNCERTAIN...SO HAVE HANDLED WITH A TEMPO GROUP DURING THE MOST VULNERABLE PREDAWN HOURS FOR NOW. VSBY OVERNIGHT WILL LIKELY BE IN THE MVFR CATEGORY AT TIMES...IF NOT LOCALLY IFR. QUESTIONS REMAIN HOW LONG REDUCED CIGS/VSBY WILL LINGER INTO TUESDAY MORNING. AT THE SAME TIME...A SECONDARY TROUGH WILL BRING POSSIBLE SHOWERS THROUGH THE MORNING...WHICH ARE HANDLED WITH A VCSH. OUTLOOK...ADDITIONAL SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ON TUESDAY AFTERNOON. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...CONIGLIO/SITES NEAR TERM...CONIGLIO SHORT TERM...CONIGLIO LONG TERM... AVIATION...SNYDER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 440 PM EDT MON AUG 11 2014 KYZ097>100-OHZ026-044>046-052>056-062>065-072>074-079>082-088-122045- BRACKEN-ROBERTSON-MASON-LEWIS-HARDIN-LOGAN-UNION OH-DELAWARE- CHAMPAIGN-CLARK-MADISON-FRANKLIN OH-LICKING-GREENE-FAYETTE OH- PICKAWAY-FAIRFIELD-CLINTON-ROSS-HOCKING-BROWN-HIGHLAND-ADAMS-PIKE- SCIOTO- 440 PM EDT MON AUG 11 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST KENTUCKY...NORTHERN KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL CONTINUE TONIGHT. THE ATMOSPHERE CONTAINS AMPLE MOISTURE...SO ANY STORM COULD BE AN EFFICIENT RAIN- PRODUCING STORM...WHICH MAY LEAD TO LOCALIZED FLOODING PROBLEMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. A TROUGH OF LOW PRESSURE IS FORECAST TO TRIGGER THUNDERSTORM DEVELOPMENT TUESDAY AFTERNOON. A FEW OF THE THUNDERSTORMS MAY APPROACH SEVERE LIMITS FOR DAMAGING WINDS AND LARGE HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. INZ050-058-059-066-073>075-080-KYZ089>096-OHZ034-035-042-043-051-060- 061-070-071-077-078-122045- WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-RIPLEY-DEARBORN-OHIO- SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON-CAMPBELL-OWEN-GRANT- PENDLETON-MERCER-AUGLAIZE-DARKE-SHELBY-MIAMI-PREBLE-MONTGOMERY- BUTLER-WARREN-HAMILTON-CLERMONT- 440 PM EDT MON AUG 11 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL INDIANA...SOUTHEAST INDIANA...NORTHERN KENTUCKY...MIAMI VALLEY OF OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO. .DAY ONE...TONIGHT. SHOWERS AND THUNDERSTORMS WILL CONTINUE TONIGHT. THE ATMOSPHERE CONTAINS AMPLE MOISTURE...SO ANY STORM COULD BE AN EFFICIENT RAIN- PRODUCING STORM...WHICH MAY LEAD TO LOCALIZED FLOODING PROBLEMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
513 PM EDT MON AUG 11 2014
KYZ093-096-097-OHZ078-112145-
PENDLETON KY-BRACKEN KY-CAMPBELL KY-CLERMONT OH-
513 PM EDT MON AUG 11 2014
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN CLERMONT...CAMPBELL...
NORTHWESTERN BRACKEN AND NORTHEASTERN PENDLETON COUNTIES THROUGH 545
PM EDT...
AT 512 PM EDT...RADAR INDICATED A STRONG THUNDERSTORM NEAR BUTLER...
MOVING EAST AT 20 MPH.
STORM HAZARDS INCLUDE...
WINDS TO 40 MPH...
PEA SIZE HAIL...
FREQUENT CLOUD TO GROUND LIGHTNING...
VERY HEAVY RAIN...
SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...BETHEL.
ALSO...ASPEN GROVE...CATAWBA...CAMPBELL COUNTY LAKE...KINCAID LAKE
STATE PARK...PEACH GROVE...GUBSER MILL...MOUNT AUBURN...LENOXBURG...
CALIFORNIA AND IVOR ARE NEAR THE PATH OF THIS STRONG THUNDERSTORM.
DO NOT STAY IN THE OPEN NOR 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.
LAT...LON 3868 8441 3880 8444 3881 8442 3882 8442
3883 8443 3882 8445 3886 8446 3889 8444
3898 8403 3874 8406PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
619 PM EDT MON AUG 11 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0618 PM HEAVY RAIN SHARONVILLE 39.28N 84.41W
08/11/2014 M1.50 INCH HAMILTON OH TRAINED SPOTTER
&&
BCThe Cincinnati radar (KILN), 52 km away, was scanning. The volume nearest the first event began at 22:51 UTC.
2 flash flood. Local standard time, as filed.
Five inches of standing water was reported covering a yard.
A couple of inches of water was flowing over Sharon Road and Reading Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2014Every state in 2014This day in weather historyWarnings in Ohio, August 2014
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: 532134, 532145.