1 flood, 1 hail, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 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 21, 8:20 PM EST, 4 hours 31 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED FOR SHORT TERM NATIONAL WEATHER SERVICE WILMINGTON OH 920 PM EDT WED JUL 21 2004 .SHORT TERM (TONIGHT)... RUC40 AND WATER VAPOR CONTINUE TO SHOW A S/WV FROM LAKE MI SWD INTO NERN IL. THIS FEATURE WILL MOVE INTO THE WRN CWFA BETWEEN 06Z AND 09Z AND S AND E OF CWFA BETWEEN 12Z AND 14Z. 00Z KILN SOUNDING WAS SHOWING A CAPPING INVERSION ABOVE THE 850 MB. BELIEVE CAP WILL WEAKEN SOMEWHAT OVERNIGHT. ALSO...WITH APCHING S/WV...925 MB TO 850 MB LOW LVL CONVERGENCE DEVELOPS BETWEEN 06Z-12Z. THIS LOW LVL FORCING SHOULD ALLOW THUNDERSTORMS OVER INDIANA TO CONTINUE ...HOWEVER...THEY WILL MOST LIKELY BECOME ELEVATED IN NATURE. DEWPOINTS ARE POOLING AHEAD OF S/WV...INTO THE LOWER 70S ...AND THESE SHOULD GRADUALLY SPREAD EAST OVERNIGHT. THUS...OVERNIGHT LOWS IN THE LOWER 70S LOOK OK AT THIS POINT. LIKELY POPS NW TO CHC POPS ELSEWHERE LOOK GOOD TOO. WILL NOT UPDATE ZONES AT THIS POINT AS AT THIS TIME THEY SEEM TO BE WELL IN HAND. WILL CONTINUE TO WATCH RADAR TRENDS...HOWEVER...TO SEE HOW WIDESPREAD THE ACTIVITY MAY BECOME. IF IT INCREASES IN COVERAGE...MAY ISSUE NEW ZONE PACKAGE LATER TO INCREASE POPS. && .PREVIOUS DISCUSSION... AVIATION (00Z-24Z)... MID LVL S/WV AND ASSOCIATED SFC TROF WAS LOCATED ACRS FAR ERN WISCONSIN INTO NRN IL AT 22Z. AIRMASS WAS BECOMING VERY UNSTABLE AHEAD OF THESE FEATURES...AND THUS...SHOWERS AND THUNDERSTORMS WERE INCREASING IN COVERAGE. AM STILL ANTICIPATING A DEVELOPING MCS WITH CURRENT SHOWERS AND THUNDERSTORMS...AND THIS FEATURE SHOULD MOVE ACRS ILN/S TAF SITES BETWEEN 05Z AND 10Z. WITH VERY MOIST AIRMASS...THUNDERSTORMS WILL REDUCE VSBYS TO AROUND 1 SM AT TIMES AND CEILINGS NEAR OR BELOW 1000 FEET. ONCE S/WV PASSES BY BETWEEN 10Z AND 12Z...SATURATED AIRMASS WILL LIKELY RESULT IN MVFR CLOUDINESS ALONG WITH AREAS OF FOG. REGION BECOMES INFLUENCED BY S/WV RIDGING BETWEEN 15Z-24Z. THIS IS NOT FAVORABLE FOR WIDESPREAD AFTN CONVECTION AS THERE WILL BE A LACK OF UPR SUPPORT. HOWEVER...AIRMASS WILL REMAIN UNSTABLE. IN FACT...BEST CHC FOR AFTN CONVECTION ON THURSDAY WILL BE BETWEEN 20Z AND 24Z...AND MAINLY NEAR THE OHIO RIVER WHERE SOME WEAK SFC CONVERGENCE IS NOTED ON THE ETA MODEL. AS A RESULT...WILL ONLY EMPLOY CB WORDING IN THE TAFS FROM 20Z THROUGH 24Z. THE FOLLOWING WAS ORIGINALLY ISSUED AT 245 PM EDT JUL 21 2004 SHORT TERM (TONIGHT THROUGH FRIDAY NIGHT)... SUB TROPICAL RDG AXIS EXTENDS FROM THE SRN PLAINS INTO THE GREAT LAKES. TROF OVER S CENTRAL CANADA TO DIG ACROSS THE GREAT LAKES SUPPRESSING THE RDG THROUGH THE PERIOD. POLAR FRONT FROM THE WESTERN GREAT LAKES THRU THE PLAINS TO SLIP INTO THE OHIO VALLEY AND LAY OUT E-W ORIENTED PARALLEL TO MID/UPR LVL FLO THU NIGHT. INITIAL PROGRESSIVE S/W TO TRACK E THRU GREAT LAKES TONIGHT WITH PRE-FRONTAL TROF SLIPPING INTO OH. AXIS OF GOOD LO LVL CONVERGENCE TO PUSH INTO THE W AROUND 04Z AND INTO SE PORTIONS OF CWA EARLY ON THU. XPCT AN MCS TO DVLP WITH THE BEST CHC FOR PRECIP ACRS THE N WHERE BETTER DYNAMICS WL BE OBSERVED. WL TREND POPS FROM LKLY NW TO CHC POPS SE LATE. TEMP WISE...WITH SFC DEWPTS INCRSG INTO THE LWR 70S PREFER WARMER MAV TEMPS FOR LOWS. FOR THURSDAY INTO FRIDAY NIGHT...HAVE OPTD TO FOLLOW ETA MODEL SOLN VERSUS THE GFS IN THE PLACEMENT/TIMING OF A COLD FRONT WITH GFS HAVING CONVECTIVE FEED BACK. WL CONT CHC POPS ACRS THE AREA WITH THE BEST CHC ACRS THE S. AFTER MORNING ACTIVITY EXPECT TO SEE A LULL IN THE CONVECTIVE ACTIVITY WITH WEAK S/W RDGG WORKING IN. WITH LOSS OF HEATING WL ONLY GO WITH LO CHC POPS ACRS THE S THU NIGHT WHERE BETTER LO LVL CONVERGENCE AND INSTBY WL EXIST AND SLIGHT CHC ACRS THE CNTRL AND N. AGAIN PREFER TO GO CLOSER TO WARMER MAV TEMPS THU AND THU NIGHT. WL CONT WITH BEST CHC OF THUNDERSTORMS ACRS THE S ON FRI CLOSE TO STALLED FNTL BNDRY WHERE MODERATE INSTBY IS EXPECTED. THE FOLLOWING WAS ORIGINALLY ISSUED AT 245 PM EDT JUL 21 2004 LONG TERM (SATURDAY THROUGH WEDNESDAY)... FOR SATURDAY...LEFT SLIGHT POPS IN EARLY AS SOME MOISTURE LINGERS ACROSS THE FAR SOUTHERN PORTION OF CWA. CANADIAN HIGH PRESSURE THEN BUILDS INTO THE LOWER GREAT LAKES AND UPPER OHIO VALLEY THROUGH EARLY MONDAY. BROUGHT POPS BACK INTO THE FORECAST MONDAY AFTERNOON AND CONTINUED THOUGH THE PERIOD AS INVERTED SURFACE TROUGH ASSOCIATED WITH LOW PRESSURE OVER THE GULF STATES NOSES INTO THE SOUTHERN PORTION OF FORECAST AREA. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. IN...NONE. KY...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 455 AM EDT WED JUL 21 2004 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-220900- ADAMS OH-AUGLAIZE OH-BOONE KY-BRACKEN KY-BROWN OH-BUTLER OH- CAMPBELL KY-CARROLL KY-CHAMPAIGN OH-CLARK OH-CLERMONT OH-CLINTON OH- DARKE OH-DEARBORN IN-DELAWARE OH-FAIRFIELD OH-FAYETTE OH-FAYETTE IN- FRANKLIN OH-FRANKLIN IN-GALLATIN KY-GRANT KY-GREENE OH-HAMILTON OH- HARDIN OH-HIGHLAND OH-HOCKING OH-KENTON KY-LEWIS KY-LICKING OH- LOGAN OH-MADISON OH-MASON KY-MERCER OH-MIAMI OH-MONTGOMERY OH- OHIO IN-OWEN KY-PENDLETON KY-PICKAWAY OH-PIKE OH-PREBLE OH-RIPLEY IN- ROBERTSON KY-ROSS OH-SCIOTO OH-SHELBY OH-SWITZERLAND IN-UNION OH- UNION IN-WARREN OH-WAYNE IN- 455 AM EDT WED JUL 21 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN INDIANA...NORTHERN KENTUCKY AND THE SOUTHWEST QUARTER OF OHIO. .DAY ONE...TODAY A FEW THUNDERSTORMS MAY DEVELOP THIS AFTERNOON AND EVENING. SOME OF THESE STORMS MAY PRODUCE FLOODING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A COLD FRONT WILL MOVE THROUGH THE REGION ON THURSDAY. SHOWERS AND THUNDERSTORMS AHEAD OF AND ALONG THIS FRONT MAY PRODUCE DAMAGING WINDS AND LARGE HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED...MAINLY ON THURSDAY.
The Cincinnati radar (KILN), 93 km away, was scanning. The volume nearest the first event began at 00:16 UTC.
1 flood, 1 hail. Local standard time, as filed.
Scattered thunderstorms produced two inches of rain across southern portions of the Columbus metro area during the early morning hours. A couple of roads were closed and impassable in Obetz.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2004Every state in 2004This day in weather historyWarnings in Ohio, July 2004
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: 5417210, 5417209.