Isolated severe weather formed during the late afternoon and early evening hours across portions of Kentucky and Ohio. The main threat was 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.
Isolated severe weather formed during the late afternoon and early evening hours across portions of Kentucky and Ohio. The main threat was 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 Aug 27, 3:31 PM EST, 1 hour 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON OH 431 PM EDT THU AUG 27 2009 .SYNOPSIS... A FRONTAL BOUNDARY WILL MEANDER ACROSS THE REGION TONIGHT INTO FRIDAY...BRINGING A CHANCE OF PRECIPITATION. A COLD FRONT WILL SWING ACROSS THE REGION ON SATURDAY...USHERING IN A MUCH COOLER AIRMASS. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... STATIONARY FNT NR THE OH RIVER WILL SLOWLY WORK N TNGT IN RESPONSE TO A DEVELOPING SFC LOW OVER THE MID MS VLY. THIS IS CAUSED BY H5 S/W SWINGING THRU THE UPPER MS VLY. GUIDANCE IS ALL OVER THE PLACE ON POPS AND QPF. WITH BNDRY IN THE VCNTY KEPT LOW CHC POPS IN FOR OVERNGT. MAV GUIDANCE IS NOT HANDLING CURRENT TD VERY WELL...IT IS TOO COOL. THEREFORE LEANED TOWARDS THE WARMER MET GUIDANCE...WITH A BLEND OF LOWS FROM THIS MORNING. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/... H5 S/W SWINGS UP THE OH VLY/SRN GREAT LAKES ON FRI PROVIDING UPPER SUPPORT. ATMO OVER THE FA WILL BE MODERATELY UNSTABLE. HOWEVER THE BETTER SFC FORCING REMAINS FARTHER W PER THE GFS/ECMWF...SO ONLY WENT WITH 50 POPS FOR FRI. CDFNT SWINGS ACRS THE FA FRI NGT INTO EARLY SAT MRNG. WENT CATEGORICAL POPS IN THE NW DOWN TO HIGH CHC IN THE S AHEAD OF FNT. ENDED THE CHC OF TS WITH FROPA. FNT WILL NEARLY BISECT THE FA AT 12Z SAT...RUNNING NR I-71...SO KEPT A MENTION OF TS IN THE E FOR SAT MRNG. AS H5 LOW CUTS OFF OVER THE GREAT LAKES SAT A SECONDARY CDFNT PUSHES ACRS THE FA. LOOKS LIKE THERE COULD BE SOME SHRA POP UP SAT LATE SAT MRNG INTO AFTN WITH THE H8 CAA AND FNTL LIFT. DRIER AIR WORKS IN AROUND UPPER LOW BY SAT EVENING...SO DRIED OUT SAT NGT. WENT A BLEND OF GUID FOR THE TEMP THRU THE PERIOD. && .LONG TERM /SUNDAY THROUGH THURSDAY/... COLD FRONT WILL MOVE THROUGH THE REGION DURING THE FIRST PART OF THE WEEKEND KEEPING A CHANCE OF SHOWERS AND THUNDERSTORMS IN THE FORECAST. SOME POST FRONTAL PRECIPITATION COULD LINGER IN THE SOUTHEAST ZONES INTO SUNDAY. THEREAFTER...HIGH PRESSURE WILL BUILD INTO THE AREA THROUGH THE MIDDLE OF THE WEEK RESULTING IN DRY CONDITIONS. TEMPERATURES WILL BE BELOW NORMAL THROUGH THE PERIOD WITH THE COOLEST READINGS ON SUNDAY AND MONDAY WHEN AN UPPER TROUGH WILL BE SWINGING THROUGH THE GREAT LAKES. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... TEMPO GROUPS ARE FCST FOR MVFR CIGS DEVELOPING AT KLCK...KDAY...AND KCMH. OTHERWISE...VFR CONDITIONS WILL PREVAIL THROUGH THE LATE EVENING AS A WEAK FRNTL BNDRY REMAINS DRAPED ACROSS SRN OH AND NRN KY. CB GROUPS ARE FCST THIS AFTN AT KILN...KCVG...KLUK...AND KDAY...AS ISOLD DIURNAL CONVECTION WILL DEVELOP. WITH LIMITED COVERAGE...HAVE LEFT OUT TSRA TEMPO GROUPS OR VCSH WORDING EVERYWHERE EXCEPT KILN AT THE MOMENT. THERE IS UNCERTAINTY WITH FOG DEVELOPMENT OVERNIGHT...AS ABUNDANT SFC MOISTURE AND CLEARING MAY ALLOW FOR VSBYS/CIGS TO DROP BELOW IFR AFTER 06Z FRI. WITH LOW- LEVEL MOISTURE AND CIGS ADVECTING IN FROM THE SOUTH...HAVE FCST PREAVILING MVFR VSBYS WITH TEMPO GROUPS FOR IFR VSBYS/CIGS EVERYWHERE EXCEPT KLUK. AT KLUK...A LIGHT SERLY FLOW WILL BE CONDUCIVE FOR VLIFR RIVER VALLEY FOG TO DEVELOP. VCSH IS FCST AFTER 14Z FRI AT KCVG AND KLUK AS THE FRNTL BNDRY LIFTS NWD AS A WARM FRONT EARLY ON FRIDAY. OUTLOOK...SHOWERS AND THUNDERSTORMS POSSIBLE FRIDAY AND SATURDAY. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...NONE. KY...NONE. IN...NONE. && SYNOPSIS...SITES NEAR TERM...SITES SHORT TERM...SITES LONG TERM... AVIATION...WOODRUM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE WILMINGTON OH 506 AM EDT THU AUG 27 2009 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-280915- 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- 506 AM EDT THU AUG 27 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. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILMINGTON OH 527 PM EDT THU AUG 27 2009 KYZ089-090-094-095-272200- GRANT KY-GALLATIN KY-CARROLL KY-OWEN KY- 527 PM EDT THU AUG 27 2009 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN OWEN...EXTREME EASTERN CARROLL...CENTRAL GALLATIN AND WESTERN GRANT COUNTIES THROUGH 600 PM EDT... AT 525 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM LOCATED NEAR BROMLEY...MOVING NORTH AT 20 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 40 MPH. THIS STORM WILL AFFECT MAINLY RURAL AREAS OF CENTRAL GALLATIN... EASTERN CARROLL...NORTHWESTERN OWEN AND WESTERN GRANT COUNTIES... INCLUDING BROMLEY...CARSON...SPARTA...EAGLE HILL...GLENCOE...FLORENCE AND ELLISTON. FREQUENT CLOUD TO GROUND LIGHTNING WILL ALSO OCCUR. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER... IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
The Cincinnati radar (KILN), 37 km away, was scanning. The volume nearest the first event began at 21:45 UTC.
1 thunderstorm wind. Local standard time, as filed.
Trees and powerlines were reported down due to damaging thunderstorm winds.
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: 191964.