Isolated severe weather and flooding developed during the afternoon and early evening hours of Friday August 28th.
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.
Isolated severe weather and flooding developed during the afternoon and early evening hours of Friday August 28th.
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 28, 12:45 PM EST, 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 145 PM EDT FRI AUG 28 2009 .SYNOPSIS... A STATIONARY FRONT OVER SOUTHERN OHIO AND INDIANA WILL MOVE BACK TO THE NORTH AS A WARM FRONT TODAY. THE THREAT FOR THUNDERSTORMS WILL INCREASE TONIGHT AS LOW PRESSURE TRACKS INTO THE LOWER GREAT LAKES AND AN ASSOCIATED COLD FRONT SWEEPS THROUGH THE REGION. HIGH PRESSURE WILL BUILD IN BEHIND THE FRONT FOR THE LATTER HALF OF THE WEEKEND AND FIRST OF NEXT WEEK...OFFERING DRIER CONDITIONS AND MUCH COOLER AIR. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... THE LATEST RUC ANALYSIS INDICATES A WEAK H5 SHOFT WAVE ADVECTING EWD ACROSS CNTRL IL WITH A CLOSED LOW LOCATED ACROSS THE FL PANHANDLE. THE FLOW ALOFT REMAINS WEAK...WITH THE LACK OF ANY JET AXIS. AT H7...A DRY POCKET OF AIR IS ADVECTING NEWD FROM CNTRL KY INTO THE CWA...CORRELATING WELL WITH CLEARING IN BTW THE TROPICAL MOISTURE ADVECTING NWD IN ASSOCIATION WITH THE UPPER LOW AND MOISTURE ASSOCD WITH A 1014 MB SFC LOW IN SRN IL. A SFC FRNTL BNDRY WHICH WAS STNRY ACROSS THE CWA FOR THE PAST FEW DAYS IS NOW ADVECTING NWD AS A WRM FRNT. AT 14Z...THE FRONT EXTENDED FROM THE LOW EWD ACROSS SRN IND AND ALONG A LINE JUST SOUTH OF THE INTERSTATE 70 CORRIDOR. THE CWA IS IN A RESPITE FROM CONVECTION AT THE MOMENT...WITH SCTD COVERAGE ADVECTING NWD ACROSS ERN KY AND A CLUSTER OF SHOWERS AND STORMS AHEAD OF THE SHT WV ALONG THE IL/IND BORDER. TEMPS THIS MORNING RANGED FROM THE MID TO UPPER 70S ACROSS THE CWA. THIS AFTERNOON...THE WARM FRONT WILL CONTINUE TO ADVECT NWD INTO NRN OHIO...WITH THE CWA IN THE WARM SECTOR THIS AFTN. IN THE SHORT TERM...THE MODELS DO NOT SEEM TO BE ACCOUNTING FOR THE WARMER TDS IN THE U60S TO L70S. THUS...THE FCST WEAK INSTBY APPEARS TO BE UNDERDONE FOR THIS AFTN. THE 12Z ILN SOUNDING INDICATES LI OF -6.8...PWAT OF 1.55...WITH A MODIFIED FCST CAPE OF APPROX 2500 J/KG. THIS MOIST ENVIRONMENT WOULD BE FAVORABLE FOR THE DEVELOPMENT OF SCTD CONVECTION THIS AFTN...WITH A FEW OF THE STORMS POSSIBLY BECOMING STRONG TO SEVERE. WITH THE FRNTL BNDRY LIFTING NWD...THERE IS A LACK OF FORCING WITH WEAK FCST SHEAR ALSO BEING A LIMITING FACTOR. WITH THE CWA REMAINING IN A FAIRLY WEAK FLOW ALOFT...SOME LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE. WITH DEVELOPMENT...WILL NEED TO MONITOR PRECIP FOR THE POSSIBILITY OF LOCALIZED FLOODING. FORTUNATELY...ASIDE FROM PRECIP AROUND 2 INCHES ACROSS NRN DELAWARE COUNTY THIS MORNING...IT HAS BEEN RELATIVELY DRY AND FFG IS FAIRLY HIGH. FOR TEMPS THIS AFTN...WITH WAA AND SRLY FLOW BEHIND THE WRM FRNT...ALONG WITH CLEARING...TEMPS WILL WARM UP NICELY INTO THE MID TO UPPER 80S ACROSS THE TRI-STATE AND INTO THE MIAMI VALLEY. OTHERWISE...CLOUD COVERAGE WILL LIMIT HIGHS TO THE LOWER 80S. && .SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/... WITH UPPER LEVEL ENERGY CARVING OUT A LOW OVER THE WESTERN GREAT LAKES TNGT...SFC WAVE TO TRACK THRU THE SRN GREAT LAKES WITH SWD TRAILING COLD FRONT PUSHING THRU THE OHIO VALLEY. NUMERICAL MODEL SOLN/S TRENDING SLOWER WITH THIS FRONTAL PASSAGE. WL TREND FCST MORE IN LINE WITH SLOWER GFS/ECMWF SOLN/S. WL INCREASE THUNDERSTORM POPS TO LKLY CATEGORY OVERNIGHT. HAVE TRENDED OVERNIGHT LOWS A LTL ABOVE MAV GUID. BASED ON SLOWER FRONTAL PASSAGE...THE FRONT WL NEARLY BISECT THE FA AT 12Z SATURDAY. THEREFORE HAVE LINGERED CHC POPS SAT MORNING. H5 LOW TO DRIFT ACRS THE GREAT LAKES SAT AND INTO ERN CANADA SUNDAY... WITH SFC HIGH PRESSURE NOSING INTO THE LOWER OHIO VALLEY. LOW LEVEL LAPSE RATES STEEPEN TO ALLOW AN INCREASE IN CLOUDS BUT HAVE OPTED FOR A DRY AFTN ON SAT AND SUNDAY...ALTHOUGH A SHOWER IS NOT OUT OF THE QUESTION MAINLY ACRS THE N CLOSER TO THE UPR LOW ON BOTH AFTN/S. HAVE STAYED CLOSE TO MAV GUID FOR HIGHS SAT AND SUNDAY AND TRENDED SAT NIGHTS LOWS TOWARD COOLER MAV. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... HIGH PRESSURE WILL BUILD INTO THE AREA THROUGH THE MIDDLE OF NEXT WEEK RESULTING IN DRY CONDITIONS. TEMPERATURES WILL BE BELOW NORMAL THROUGH THE PERIOD WITH THE COOLEST READINGS ON MONDAY WHEN AN UPPER TROUGH WILL BE SWINGING THROUGH THE GREAT LAKES. && .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/... A WARM FRONT HAS LIFTED NORTH OF THE TERMINALS WITH WINDS BECOMING SRLY. SCTD CONVECTION WILL DEVELOP THIS AFTN ACROSS THE TERMINALS. TEMPO GROUPS ARE FCST THIS AFTN FOR TSRA WITH IFR VSBYS. DIURNAL CONVECTION WILL DIMINISH SOMEWHAT BEFORE A CLUSTER OF SHOWERS AND THUNDERSTORMS MOVE INTO THE AREA OVERNIGHT. VCSH WITH CB GROUPS IS FORECAST ACROSS THE TERMINALS AFTER 01Z. IN A MOIST SRLY FLOW AHEAD OF A COLD FRONT...MVFR BR OR HZ WILL DEVELOP OVERNIGHT ACROSS THE TERMINALS. THE COLD FRONT WILL CROSS THE TERMINALS BY 12Z SAT...WITH CONVECTION DIMINISHING IN ITS WAKE SAT MORNING. WITH THE PASSAGE OF THE FRONT A PD OF IFR CIGS AND VSBYS WILL BE POSSIBLE DURING THE EARLY MORNING HRS ACROSS THE TERMINALS...LIFTING TO MVFR DURING THE LATE MORNING HRS BEFORE CLOUD COVERAGE DIMINISHES BEHIND THE FRONT. OUTLOOK...NO SIGNIFICANT WEATHER EXPECTED. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...AR NEAR TERM...WOODRUM SHORT TERM...AR LONG TERM... AVIATION...WOODRUM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 1118 AM EDT FRI AUG 28 2009 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-290930- 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- 1118 AM EDT FRI AUG 28 2009 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. SHOWERS AND THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT THIS AFTERNOON. A FEW OF THE STORMS MAY BECOME STRONG WITH GUSTY WINDS POSSIBLE. LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE WITH SLOW MOVING STORMS THIS AFTERNOON AND OVERNIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. WOODRUM
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON OH 231 PM EDT FRI AUG 28 2009 OHZ065-281900- FAIRFIELD OH- 231 PM EDT FRI AUG 28 2009 ...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN FAIRFIELD COUNTY THROUGH 300 PM EDT... AT 230 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM LOCATED NEAR THURSTON...MOVING EAST AT 10 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. LOCATIONS IMPACTED INCLUDE... MILLERSPORT...PLEASANTVILLE AND FAIRFIELD BEACH. IN ADDITION...WEST RUSHVILLE AND RUSHVILLE ARE NEAR THE PATH OF THIS STORM. HATZOS
The Cincinnati radar (KILN), 116 km away, was scanning. The volume nearest the first event began at 18:35 UTC.
2 thunderstorm wind, 1 flash flood, 1 hail. Local standard time, as filed.
Hail ranged in size from pennies to nickels.
There were several reports of street flooding across Grove City with four water rescues also reported.
Two trees were reported down on Cunningham-Arbela Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2009Every state in 2009This day in weather historyWarnings in Ohio, August 2009
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: 191966, 191969, 191967, 191968.