Persistent rain showers associated with low pressure produced heavy rainfall totals and isolated flooding during the morning hours.
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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.
Persistent rain showers associated with low pressure produced heavy rainfall totals and isolated flooding during the morning 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 Sep 2, 12:56 AM EST, 1 hour 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 156 AM EDT SUN SEP 2 2012 .SYNOPSIS... THE REMNANTS OF HURRICANE ISAAC WILL SLOWLY MOVE EAST THROUGH THE OHIO VALLEY FROM SATURDAY THROUGH MONDAY. THIS WILL RESULT IN OCCASIONAL SHOWERS AND THUNDERSTORMS. THE LOW WILL MOVE EAST OF THE REGION ON TUESDAY...GRADUALLY BRINGING THE THREAT OF PRECIPITATION TO AN END. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... MAJORITY OF CONVECTION HAS WEAKENED FROM EARLIER THIS EVENING. MAINLY LIGHT TO MODERATE AREAS OF RAIN REMAIN ACROSS THE NORTHEASTER ZONES. RADAR TRENDS AS WELL AS THE RECENT HRRR INDICATE THAT MUCH OF THE ACTIVITY WILL CONTINUE TO WANE OVER THE NEXT COUPLE OF HOURS. CANNOT RULE OUT ISOLATED SHOWERS OR A POSSIBLE THUNDERSTORM TO DEVELOP TONIGHT ACROSS THE AREA...ESPECIALLY ACROSS THE NORTHEAST. A BREAK IN CLOUD COVER ACROSS INDIANA WILL GRADUALLY FILL IN AS THE NIGHT PROGRESSES. THIS WILL LEAVE US MOSTLY CLOUDY FOR THE MOST PART FOR THE OVERNIGHT PERIOD. && .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM MONDAY/... THE MOIST AND CONVECTION-RIDDEN PATTERN WILL CONTINUE THROUGH MONDAY...AS POST-ISAAC SLOWLY MOVES EAST. THE SYSTEM WILL LOSE ITS DEFINITION SOMEWHAT OVER TIME...BUT THE SURFACE LOW WILL AT LEAST MAINTAIN SOME STRUCTURE AS IT MOVES INTO SOUTH-CENTRAL KENTUCKY. THE GREATEST FOCUS FOR PRECIPITATION WILL BE IN THE SOUTH HALF OF THE CWA ON SUNDAY. PRECIPITABLE WATER VALUES MAY ACTUALLY INCREASE SOMEWHAT ON SUNDAY AND SUNDAY NIGHT...SO THE LOCALIZED FLOODING THREAT WILL REMAIN IN PLACE. THE ATMOSPHERE ON SUNDAY WILL BE VERY MOIST IN THE LOW LEVELS. IN ADDITION...THE AREA IMMEDIATELY TO THE EAST OF THE SURFACE LOW WILL ENTER A REGIME WITH INCREASING SOUTHERLY LOW-LEVEL SHEAR (UP TO AROUND 20 KNOTS AT 0-1KM). THIS ENVIRONMENT IS SOMEWHAT SUPPORTIVE OF WEAK...NON-SUPERCELLULAR TORNADOES. THOUGH FAR FROM A CERTAINTY...IT IS A SITUATION THAT WILL NEED MONITORING ON SUNDAY. ON MONDAY...THE PRECIPITATION FOCUS WILL SHIFT TO THE SOUTHEASTERN HALF OF THE CWA. THE HIGHEST POPS WERE FOCUSED ON DIURNAL TIMING. THE TEMPERATURE GRIDS WERE NOT CHANGED SIGNIFICANTLY FROM THE PREVIOUS FORECAST. A RATHER SMALL DIURNAL CYCLE IS EXPECTED. ONE THING LEARNED FROM THE FORECAST TODAY IS THAT ANY BRIEF BREAKS IN THE OVERCAST COULD ALLOW TEMPS TO RISE QUICKLY IN LOCALIZED PLACES. HOWEVER...THIS SEEMS LESS LIKELY FOR SUNDAY THAN IT WAS ON SATURDAY. && .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/... A BLEND OF HPC AND THE 00Z ECMWF WAS USED FOR THE LONG TERM FORECAST. MODELS INDICATE THAT THE REMNANTS OF ISAAC WILL CONTINUE TO WEAKEN ACROSS THE OHIO VALLEY REGION MONDAY NIGHT AND TUESDAY. WITH MOISTURE STILL IN PLACE...ALONG WITH WEAK FORCING AND INSTABILITY...HAVE CONTINUED WITH MAINLY CHANCE POPS DURING THIS PERIOD. FOR TUESDAY NIGHT INTO WEDNESDAY...THE REMNANTS OF ISAAC SHOULD FURTHER WEAKEN AND GET CAUGHT UP IN THE DEVELOPING MID LEVEL WESTERLY FLOW. LINGERING MOISTURE AND INSTABILITY WILL REQUIRE HANGING ON TO LOW CHANCE POPS. MODELS ARE HAVING SOME TIMING ISSUES WITH A COLD FRONT THAT IS FORECAST TO PUSH SOUTHEAST THROUGH THE REGION SOMETIME BETWEEN WEDNESDAY NIGHT INTO THURSDAY NIGHT. WILL ALLOW THE FRONTAL BOUNDARY TO CLEAR THE REGION BY LATE THURSDAY AFTERNOON. THERE WILL BE A THREAT OF SHOWERS AND THUNDERSTORMS ALONG AND AHEAD OF THE FRONT. HIGH PRESSURE IS FORECAST TO BUILD INTO THE AREA FOR FRIDAY AND WILL MOVE OFF TO THE EAST ON SATURDAY. AT THIS TIME...DRY WEATHER IS EXPECTED. TEMPERATURES WILL BE A LITTLE ABOVE NORMAL THROUGH MID WEEK...THEN NEAR TO SLIGHTLY BELOW NORMAL BY THE END OF THE WEEK. && .AVIATION /06Z SUNDAY THROUGH THURSDAY/... VFR CONDITIONS WILL START OUT THE TAF PERIOD. THE REMNANTS OF ISAAC WILL OCCASIONALLY BRING PRECIPITATION TO THE TAF SITES THROUGH THE TAF PERIOD. CURRENTLY THERE ARE SOME SHOWERS AROUND THE KCMH AND KLCK TAF SITES. MODELS ARE INDICATING THAT ADDITIONAL SCATTERED SHOWER AND ISOLATED THUNDERSTORM ACTIVITY WILL DEVELOP ACROSS THE REST OF THE TAF SITES OVERNIGHT. MVFR VSBYS MAY BE POSSIBLE WITH SOME OF THE SHOWERS. MORE ORGANIZED SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO DEVELOP DURING THE DAY ON SUNDAY AND IMPACT THE TAF SITES. LIMITED VCTS AND TSRA MENTION TO TIME FRAME THAT LOOKS THE MOST FAVORABLE FOR THUNDERSTORMS ALTHOUGH THUNDERSTORMS CANNOT BE RULED OUT AT ANY ONE POINT DURING THE DAY ON SUNDAY. PRECIPITATION WILL TAPER OFF DURING THE EVENING HOURS ACROSS THE TAF SITES. CIGS WILL LOWER DURING THE EVENING AND INTO THE OVERNIGHT HOURS AT THE AREA TAF SITES. .OUTLOOK...MVFR CEILINGS AND VISIBILITIES...WITH LOCAL IFR VISIBILITIES...WILL BE POSSIBLE WITHIN SHOWERS AND EMBEDDED THUNDERSTORMS THROUGH TUESDAY. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...HATZOS NEAR TERM...LATTO SHORT TERM...HATZOS LONG TERM...HICKMAN AVIATION...NOVAK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 321 PM EDT SAT SEP 1 2012 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-021930- 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- 321 PM EDT SAT SEP 1 2012 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...THIS AFTERNOON AND TONIGHT. SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS THE REGION THIS EVENING AND OVERNIGHT. SOME OF THE STORMS MAY PRODUCE LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. SHOWERS AND THUNDERSTORMS WILL CONTINUE ON SUNDAY AND MONDAY...AS THE REMNANTS OF HURRICANE ISSAC MOVE SLOWLY ACROSS THE AREA. WHILE THIS RAIN WILL MOSTLY BE BENEFICIAL...SOME OF THE STORMS MAY PRODUCE LOCALLY HEAVY RAINFALL. THERE IS SOME POTENTIAL FOR LOCALIZED FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTERS AND COCORAHS OBSERVERS ARE ENCOURAGED TO REPORT RAINFALL TOTALS TO THE NATIONAL WEATHER SERVICE. HATZOS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON OH
900 PM EDT SAT SEP 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0855 PM HEAVY RAIN HUBER HEIGHTS 39.86N 84.11W
09/01/2012 M3.22 INCH MONTGOMERY OH TRAINED SPOTTER
RAINFALL TOTAL FROM AROUND 730 PM UNTIL 855 PM.
&&
ASLThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
High water was reported over a road due to heavy rainfall.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2012Every state in 2012This day in weather historyWarnings in Ohio, September 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: 411956.